Fermented medicinal herbs improve hematological and physiological profile of Striped catfish (Pangasianodon hypophthalmus)

Henni Syawal; Ronal Kurniawan; Irwan Effendi; Brian Austin

doi:10.12688/f1000research.52640.3

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Research Article

Revised

Fermented medicinal herbs improve hematological and physiological profile of Striped catfish (Pangasianodon hypophthalmus)

[version 3; peer review: 1 approved, 2 approved with reservations]

Previously titled: Fermented medicinal herbs improve the hematological and physiological profile of Striped catfish (Pangasionodon hypophthalmus)

Henni Syawal¹, Ronal Kurniawan¹, Irwan Effendi ¹, Brian Austin²

PUBLISHED 19 Apr 2022

Author details Author details

¹ Universitas Riau, Pekanbaru, 28294, Indonesia
² Insitute of Aquaculture, University of Stirling, UK, UK

Henni Syawal
Roles: Conceptualization, Methodology, Project Administration, Writing – Review & Editing

Ronal Kurniawan
Roles: Conceptualization, Investigation, Methodology, Software, Writing – Original Draft Preparation

Irwan Effendi
Roles: Conceptualization, Methodology, Validation, Writing – Original Draft Preparation, Writing – Review & Editing

Brian Austin
Roles: Data Curation, Methodology, Resources, Validation, Writing – Original Draft Preparation, Writing – Review & Editing

OPEN PEER REVIEW

REVIEWER STATUS

This article is included in the Agriculture, Food and Nutrition gateway.

Abstract

This study sought to determine the effect of fermented medicinal herbs (FMH), i.e. cutchery (Kaempferia galanga), turmeric (Curcuma longa) and curcuma (Curcuma xanthorrhiza) in combination with molasses and probiotic drink (Yakult), administered orally on the hematological and physiological profile of striped catfish (Pangasianodon hypophthalmus). A complete randomized design (CRD) experiment was used with four levels of treatments, namely P0 (control), P1 (FMH 100 mL/kg), P2 (FMH 200 mL/kg) and P3 (FMH 300 mL/kg) of feed. The fish were kept in a farm in cages at 75 fish/m³ and fed with the experimental diets for 60 days. The results revealed that FMH (P2) dietary administration improved hematological and physiological profile of catfish, i.e total erythrocytes of 2.81 x 10⁶ cells/mm³, hematocrit values of 39.00%, hemoglobin levels of 10.73 g/dL, total leukocytes of 11.41 x 10⁴ cells/mm³, blood glucose 97.33 mg/dL, and total serum protein 4.10 mg/dL compared to controls with 1.89 x 10⁶ cells/mm³, 32.33 %, g/dL, 9.67 x 10⁴ cells/mm³, 67.33 mg/dL, and total serum protein of 3.10 mg/dL, respectively. Moreover, the diet improved special growth rate, feed conversion ratio, feed efficiency and the survival rate of catfish. The hematological and physiological profile of catfish improvement are considered to be due to the content of secondary metabolites of FMH, namely curcuminoids, vitamin C, essential oils, tannins, and flavonoids, which trigger immunostimulation. The presence of curcuminoids provide an antioxidant effect on cell membranes reducing erythrocyte cell membrane damage due to oxidation. Similarly, flavonoids are natural antioxidants, which are credited with the ability of reducing free radicals and anti-free radicals.

Keywords

Medicinal herb, Catfish, Immunostimulant, Hematology, Physiology, Immunity

Corresponding author: Irwan Effendi

Competing interests: No competing interests were disclosed.

Grant information: Funding was provided by community Research and Development institute Universitas Riau, DRPM DIKTI (807/UN.19.5.1.3/ PT.01.03/2019).
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Copyright: © 2022 Syawal H et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

How to cite: Syawal H, Kurniawan R, Effendi I and Austin B. Fermented medicinal herbs improve hematological and physiological profile of Striped catfish (Pangasianodon hypophthalmus) [version 3; peer review: 1 approved, 2 approved with reservations]. F1000Research 2022, 10:466 (https://doi.org/10.12688/f1000research.52640.3) First published: 14 Jun 2021, 10:466 (https://doi.org/10.12688/f1000research.52640.1) Latest published: 19 Apr 2022, 10:466 (https://doi.org/10.12688/f1000research.52640.3)

Revised Amendments from Version 2

Changes to the manuscript include:

The SGR formula to SGR=LnWt-LnWot x 100
The addition of standard deviation in Table 2 and Table 3
An explanation of FCR and feed efficiency that affect fish growth, as well as regarding the effect of fermented herbs on increasing blood glucose

To read any peer review reports and author responses for this article, follow the "read" links in the Open Peer Review table.

Introduction

Attention in aquaculture in developing countries has focused on the use of nonspecific immunostimulants and plant products, which could have a beneficial effect in fish disease control. Interest in medicinal plants for application to aquaculture follows their use in human medicine and agriculture as proven prophylactic and therapeutic agents.¹^–³ For example, garlic (Allium sativum) and ginger (Zingiber officinale)⁴ have histories of dietary and medicinal applications as anti-infective agents. Evidence of their value include inhibition towards pathogens of relevance to aquaculture, including bacteria,⁵^–⁷ viruses,⁸^–¹⁰ and protozoa.¹¹^,¹²

Some researchers have reported the impact of herbal supplemented diets on hematology and innate immunity of fish.¹³^,¹⁴ For example, Chinese herbs (Lonicera japonica and Ganoderma lucidum) enhanced the non-specific immune response of tilapia (Oreochromis niloticus), leading to protection against Aeromonas hydrophila.¹⁵ Similarly, the dietary administration of rose hip and safflower stimulated growth performance, hematological, biochemical parameters and innate immune responses of beluga (Huso huso)¹⁶^,¹⁷ The supplemented probiotic stimulated growth performance and feed utilization of keureling fish Tor tambra. Medicinal herb has weaknesses, one of which is a strong aroma and bitter taste, so it is no liked by fish. Therefore, it is necessary to carry out fermentation. Against this background, fermented medicinal herbs (FMH) in combination with molasses and probiotic drink (Yakult) have been used successfully as dietary supplements on a small number of rural catfish farms in Sumatra, Indonesia, for approximately two years. Anecdotal evidence has suggested that fish grow better and faster, appear to be healthier, and the flesh tastes better after cooking. Fish, which have received these diets, have been examined for potential improvements to hematology and physiology.

Methods

Experimental diet

This research was conducted on floating net cages in the Reservoir of the Faculty of Fisheries and Marine Affairs by using a completely randomized design with four treatments and three replications, namely P0 (control), P1 (FMH 100 mL/kg feed), P2 (FMH 200 mL/kg), and P3 (FMH 300 mL/kg). all steps in this experiment was carried out within the international ethical guidelines provided by ARRIVE guidelines.

Fish

A total of 2700 fingerling catfish used had an average length of 9 cm and an average weight of 6 g. Catfish were obtained from local farmers in Kampar Regency and distributed randomly into cages measuring 1 × 1.5 × 1 m with a density of 75 individuals/m³. The cages were constructed of polyethylene nets with a mesh size of 7 × 7 mm. Water was free-flowing, and the temperature ranged 27.5–29.5°C.

All fish were acclimatized for seven days before use. The fish samples were selected based on their performance. The fish that showed active swimming, no wounds or external parasites. To measure the growth of the fish, every 10 days a random weighing of the fish was carried out.

Use of dietary supplements

The dietary supplements were chosen because of their availability, and use in local, Sumatran, aquaculture. Thus, fermented medicinal herbs (FMH) consisting of cutchery (Kaempferia galanga), turmeric (Curcuma longa) and curcuma (Curcuma zanthorrhiza) together with molasses, probiotic drink (Yakult), fresh water and yeast (Saccharomyces cerevisiae) were used (Table 1). Fresh turmeric, cutchery, and curcuma were washed, thinly sliced, mixed and milled. Then, 300-g quantities were transferred to 3 L of water, boiled for 30 min, and cooled to room temperature. The mixture was then squeezed and filtered to obtain the liquid fraction, which totalled 2.7 L. This was mixed with 175 mL of molasses, 65 mL of probiotic drink and 50 g of yeast. Then, the mixture was stirred until homogeneous and poured into 5-L capacity jerry cans, which were tightly closed. Fermentation was allowed to occur for 7–10 days until the aroma changed from a curcuma smell to a strong alcoholic odour, and gas was no longer produced. The gas produced during fermentation was released daily by opening the lids for a few seconds. FMH was added to 1-kg quantities of pelleted feed (Hi-Pro-Vite 781 PT. Central Proteina Prima Tbk) to achieve 0 (control; P0), 100 mL/kg (P1), 200 mL/kg (P2) and 300 mL/kg (P3) The feed was administered three times a day to achieve 5% of body weight for 60 days, which reflected the period that the diets have been used on fish farms. Survival rates were calculated using the following formula, SR = Nt/No×100%, where SR = survival (%), Nt = number of live fish at the end of the study, and No = number of live fish at the beginning of the study.

Table 1. Composition of medicinal herb mixture.

Items	Amount
Fresh tumeric rhizome (g)	100
Fresh cutchery rhizome (g)	100
Fresh curcuma rhizome (g)	100
Molasses (mL)	175
Probiotic drink (mL)	65
Mineral water (mL)	3000
Yeast (mg)	50

Examination of fish blood

Fish blood was removed at 0, 30 days and 60 days. Thus, the fish were anesthetized with clove oil at a dose of 0.05 mL/L. Blood was withdrawn from the caudal vein using 1-mL syringes that had been rinsed with 10% EDTA, collected in microtubes (Axygon) and stored at room temperature until use. The fish that have been blood drawn are then awakened by placing them in a container filled with aerated water. The fish were returned to the cages after they were seen breathing and swimming normally.

To determine the number of erythrocytes, blood in 0.1-mL quantities was mixed thoroughly with 1.0 mL of Hayem solution comprising sodium sulfate, sodium chloride and mercuric chloride.¹⁹ Then, the number of erythrocytes was determined by use of a hemocytometer at a magnification of ×40 with calculation according to the formula of Blaxhall and Daisley.¹⁹ The method of Blaxhall and Daisley¹⁹ was used to estimate the total number and types (i.e. lymphocytes, monocytes, neutrophils, and platelets) of leucocytes. For this, blood was dripped onto a hemocytometer slide, covered with a coverslip, and examined microscopically with a magnification of ×40. The total number of leukocytes was calculated using the following formula: ∑Leukocytes = ∑n × 50 cells/mm³, where ∑n = total number of leukocytes in four large boxes, and 50=dilution factor. Calculation of hemoglobin levels was carried out using Sahli’s method.²⁰ To determine hematocrit level, blood was drawn into a hematocrit capillary tube the end of which was blocked with crystoseal.¹⁹ Then the capillary tube was centrifuged for 3 min at 11000 rpm in a microhematocrit centrifuge Model SH120-1. The hematocrit was measured as a percentage of the hematocrit value in the microhematocrit reader

Blood glucose was measured using GlucoDr (allmedicus) with a range of 20–600 mg/dL. Glucose testing was carried out in the morning before the fish were fed.²¹ Total serum protein was measured by the method of Anderson and Siwicki.²² Blood was centrifuged at 3,500 rpm for 15 min to completely separate the serum, which was transferred to a fresh microtube. Then, 20 μL of serum and 1000 μL of protein test reagent (Reiged Diagnostics) were added to each microtube, with mixing. After incubation for 15 min, the absorbance was read at λ 595–610 nm.

Growth parameters

a) The absolute weight was measured using the formula AW = Wt − Wo, where AW = absolute weight (g), Wt = average weight at the end of the study (g), and Wo = average length at the beginning of the study (g).
b) Specific growth rates were calculated using the formula, $SGR = \frac{LnWt - LnWo}{t} \times 100$ , where Wt = larvae weights at the end of the study (g), Wo = larvae weights at the beginning of the study (g), and t = length of study (day).
c) Feed conversion was calculated by using the formula, $FCR = \frac{ΣF}{(Bt + Bm) - Bo}$ , where FCR = feed conversion ratio, ΣF = amount of feed fed during experiment (g), Bt = fish biomass weight at the end of maintenance (g), Bo = fish biomass at the beginning of study (g), and Bm = biomass of dead fish during maintenance (g).
d) Feed efficiency was calculated by using formula, FE = (Bt + Bm) − Bo)/F × 100, where FE = feed efficiency, ΣF = amount of feed fed during experiment (g), Bt = fish biomass at the end of experiment (g), Bm = biomass of fish that died during the study (g), and Bo = fish biomass at the beginning of the study (g).

Statistical methods

The experiments employed a completely randomized design (CRD) involving use of SPSS version 22.

Statement on animal ethics

All animals are treated according to animal welfare guidelines that have been established and approved by the Dean of the Faculty of Fisheries and Marine Sciences, Riau University (Prof. Bintal Amin, serves as the ethical committee who approved the use of vertebrate animals in this experiments with number: 346/UN19.5.1.1.4/KP/2020).

Results

The fish consumed the experimental diets better than the controls without any evidence of a period of adjustment. Moreover, compared with the controls, the fish receiving the experimental diets were more active, responding quickly to the arrival of the feed. Overall, the FMH diets improved the growth rate of fish significantly (p < 0.05). In addition, the provision of the supplements maintained the survival rate of catfish at 100% (Table 2).

Table 2. Growth of striped catfish during the study.

Treatment	Parameters
Treatment	Absolute weight (g) ± SD	SGR (%/day) ± SD	FCR ± SD	Feed efficiency (%) ± SD	SR (%)
P0	89.11 ± 3.71^a	4.45 ± 0.05^a	1.57 ± 0.03^d	63.81 ± 1.51^a	96
P1	108.95 ± 0.09^b	4.72 ± 0.03^b	1.35 ± 0.01^c	73.87 ± 0.30^b	100
P2	119.08 ± 1.02^c	4.86 ± 0.02^c	1.21 ± 0.01^a	82.93 ± 0.42^d	100
P3	112.02 ± 1.18^b	4.77 ± 0.05^b	1.25 ± 0.01^b	79.99 ± 0.60^c	100

FMH diets improved the hematological profile of striped catfish significantly (p < 0.05) compared to the experimental controls. Thus, total erythrocyte counts ranged between 2.45–2.81 × 10⁶ cells/mm³, hematocrit values were from 35.67 to 39.00%, and hemoglobin levels ranged from 9.2–10.73 g/dL (Table 3). This compares with 1.89 × 10⁶ cells/mm³, 32.33 %, and 8.80 g/dL, for the controls (Table 3). Consistently, diet P2 exhibited the best level of hematological profiles at both 30 and 60 days after initiating the feeding regime (Table 3). Moreover, the examination of the groups revealed that the fish were in excellent condition, were more agile, and appeared to have a better colour. The internal organs were normal in appearance.

Table 3. Results of measurement of striped catfish hematological profile during the study.

Superscript letters on the same line show significantly different results between treatments (p < 0.05). RBC: red blood cell (×10⁶ cells/mm³); WBC: white blood cell (×10⁴ cells/mm³).

Treatment	Parameters
Treatment	RBC ± SD	Hematocrit (%) ± SD	Hemoglobin (g/dL) ± SD	WBC ± SD	Lymphocyte (%) ± SD	Monocyte (%) ± SD	Neutrophile (%) ± SD	Thrombocyte (%) ± SD
Day 30
P0	1.75 ± 0.03^a	29.00 ± 1.00^a	8.80 ± 0.20^a	9.20 ± 0.05^a	76.67 ± 0.58^a	7.33 ± 0.58	7.67 ± 0.58^b	8.67 ± 0.58^b
P1	1.82 ± 0.01^b	35.00 ± 1.00^b	9.27 ± 0.23^b	9.47 ± 0.11^b	78.67 ± 0.58^b	6.67 ± 0.58	6.33 ± 0.58^ab	8.33 ± 0.58^b
P2	1.91 ± 0.02^c	37.00 ± 1.00^b	10.73 ± 0.11^d	10.65 ± 0.05^d	81.67 ± 0.58^c	6.33 ± 0.58	5.33 ± 0.58^a	6.67 ± 0.58^a
P3	1.85 ± 0.02^b	37.00 ± 1.00^b	9.87 ± 0.11^c	10.31 ± 0.03^c	79.33 ± 0.58^b	6.33 ± 0.58	6.67 ± 0.58^ab	7.67 ± 0.58^ab
Days 60
P0	1.89 ± 0.07^a	32.33 ± 2.08^a	9.20 ± 0.05^a	9.67 ± 0.14^a	77.33 ± 0.58^a	7.33 ± 0.58	7.33 ± 0.58^b	8.00 ± 1.00^b
P1	2.45 ± 0.10^b	35.67 ± 0.58^b	9.47 ± 0.11^b	10.04 ± 0.09^b	79.67 ± 0.58^b	6.67 ± 1.15	6.67 ± 0.58^ab	7.00 ± 1.00^ab
P2	2.81 ± 0.02^c	39.00 ± 1.00^c	10.65 ± 0.05^d	11.41 ± 0.09^d	82.33 ± 0.58^c	6.00 ± 1.00	6.00 ± 1.00^a	5.33 ± 0.58^a
P3	2.53 ± 0.06^b	38.33 ± 0.58^c	10.31 ± 0.03^c	11.14 ± 0.13^c	80.33 ± 0.58^b	6.33 ± 0.58	6.67 ± 0.58^ab	6.67 ± 0.58^ab

FMH affected the physiological profile of striped catfish significantly (p < 0.05) compared with the controls. Thus, blood glucose levels and total serum protein increased from 78.67 to 97.33 mg/dL and 3.70 to 4.10 mg/dL; osmoregulation ranged from 288–327 mOsm/L H₂O, absolute weight from 89.11–119.08 g, and the survival rate from 96–100% (Table 4).

Table 4. Physiological profile of striped catfish during the study.

Superscript letters on the same line show significantly different results between treatments (p < 0.05). SR: survival rate.

Treatment	Parameters
Treatment	Blood glucose (mg/dL) ± SD	Serum total protein (mg/dL) ± SD	Osmoregulation (mOsm/L H₂O) ± SD	Absolute weight (g) ± SD	SR (%)
P0	67.33 ± 5.03^a	3.10 ± 0.27^a	293 ± 9.86^a	89.11 ± 3.71^a	96
P1	78.67 ± 4.16^b	3.70 ± 0.10^b	289.33 ± 7.51^a	108.95 ± 0.09^b	100
P2	97.33 ± 7.02^c	4.10 ± 0.10^c	289.67 ± 18.50^a	119.08 ± 1.02^c	100
P3	96.67 ± 5.51^c	3.97 ± 0.15^bc	327.00 ± 16.70^b	112.02 ± 1.18^b	100

Discussion

This study has supported the use of FHM feed supplements in Indonesian aquaculture, and provided evidence for the mode of action. Thus, there were notable improvements in the hematological and physiological profiles of catfish. Indeed, similar results have been reported by other researchers. For example, Lee et al. ²³ evaluated the dietary supplementation of citrus by-products (CB) fermented with probiotic bacteria on growth performance, feed utilization, innate immune responses and disease resistance of juvenile olive flounder. They noted that innate immunity was significantly enhanced by CBF–BS (CB fermented with Bacillus subtilis) supplementation. This study indicated that the fermentation of CB with probiotic had beneficial effects on innate immunity and thereby increased disease resistance. Furthermore, it is also supported by 17 the use of probiotics from herbal ingredients can increase the growth performance and feed efficiency of Keureling.

The important components of FMH are considered to be due to the content of secondary metabolites, namely curcuminoids, vitamin C, essential oils, tannins, and flavonoids, which trigger immunostimulation.²⁴ The presence of curcuminoids provide an antioxidant effect on cell membranes reducing erythrocyte cell membrane damage due to oxidation.²⁵ Similarly, flavonoids are natural antioxidants, which are credited with the ability of reducing free radicals and anti-free radicals.²⁶

The benefit of FMH for improved growth performance mirrors previous work by Hoseinifar et al.,²⁷ who reported that dietary application of the phytoimmunostimulant Persian hogweed (Heracleum persicum) improved growth significantly. Specifically, the final weight, weight gain, specific growth rate and feed conversion ratio were significantly improved in fish that received dietary H. persicum at or above 5 g/kg.²⁷

Herbal supplements with different doses had an effect on the value of the catfish feed conversion ratio (p<0.05). The herbal supplement dose of 200 mL/kg of feed gave the best feed conversion ratio value of 1.23. This shows that giving herbal supplements at a dose of 200 mL/kg is more efficient than other doses, because the nutritional content has met the nutritional needs of fish. Increased feed conversion depends on feed quality, good feed quality can be digested and absorbed by the fish body to grow, and good feed nutritional quality is influenced by the high and low levels of protein in the feed.²⁸

The content of metabolites such as curcumin and essential oils. Physically and chemically curcumin and essential oils have potential as feed additives in feed with the aim of increasing productivity, product quality, and health. Physiologically, these compounds work synergistically by stimulating the secretion of large amounts of dilute bile, so that the flow to the small intestine becomes larger and the absorption of feed in the small intestine is easier, and works in the process of emptying the gallbladder, so that the fluid products of the cells are produced. liver increases, thus helping the process of absorption of food essence.²⁹

This increase in blood glucose is related to feed quality. This blood glucose can be an immunosuppressor in fish, this is because when glucose levels in the blood are high, the kidneys work harder to maintain body balance.³⁰ When fish are stressed, fish need a lot of energy to adapt to the stress. The high need for energy to maintain life will stimulate the mobilization of glucose into the blood.³¹

Clearly, this study has demonstrated that dietary FMH, particularly when dosed at 200 mL/kg of feed, improved the hematological and physiological profile of catfish. Also, there was benefit for specific growth rate, feed conversion ratio and survival.

Data availability

All data underlying the results are available as part of the article and no additional source data are required

Acknowledgements

We are grateful to University of Riau, Ministry of Research, Technology and Higher Education of Indonesia for financial support.

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¹ Universitas Riau, Pekanbaru, 28294, Indonesia
² Insitute of Aquaculture, University of Stirling, UK, UK

Henni Syawal
Roles: Conceptualization, Methodology, Project Administration, Writing – Review & Editing

Ronal Kurniawan
Roles: Conceptualization, Investigation, Methodology, Software, Writing – Original Draft Preparation

Irwan Effendi
Roles: Conceptualization, Methodology, Validation, Writing – Original Draft Preparation, Writing – Review & Editing

Brian Austin
Roles: Data Curation, Methodology, Resources, Validation, Writing – Original Draft Preparation, Writing – Review & Editing

Competing interests

No competing interests were disclosed.

Grant information

Funding was provided by community Research and Development institute Universitas Riau, DRPM DIKTI (807/UN.19.5.1.3/ PT.01.03/2019).
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Article Versions (3)

version 3

Revised

Published: 19 Apr 2022, 10:466

https://doi.org/10.12688/f1000research.52640.3

version 2

Revised

Published: 11 Nov 2021, 10:466

https://doi.org/10.12688/f1000research.52640.2

version 1

Published: 14 Jun 2021, 10:466

https://doi.org/10.12688/f1000research.52640.1

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© 2022 Syawal H et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Syawal H, Kurniawan R, Effendi I and Austin B. Fermented medicinal herbs improve hematological and physiological profile of Striped catfish (Pangasianodon hypophthalmus) [version 3; peer review: 1 approved, 2 approved with reservations]. F1000Research 2022, 10:466 (https://doi.org/10.12688/f1000research.52640.3)

NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.

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ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested

Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.

Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions

Version 3

VERSION 3

PUBLISHED 19 Apr 2022

Revised

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7

Reviewer Report 20 Apr 2022

Mohammed El Basuini, Department of Animal Production, Faculty of Agriculture, Tanta University, Tanta, Egypt

Approved

https://doi.org/10.5256/f1000research.128325.r135069

The authors have included all the ... Continue reading

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Version 2

VERSION 2

PUBLISHED 11 Nov 2021

Revised

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11

Reviewer Report 06 Jan 2022

Mohammed El Basuini, Department of Animal Production, Faculty of Agriculture, Tanta University, Tanta, Egypt

Approved with Reservations

https://doi.org/10.5256/f1000research.77351.r102340

More background is required on the application of fermented plant-based diets in aquaculture.

A simple paragraph or summary on the type of fish used in terms of importance, production, or normal distribution.

"fermented medicinal ... Continue reading

More background is required on the application of fermented plant-based diets in aquaculture.

A simple paragraph or summary on the type of fish used in terms of importance, production, or normal distribution.

"fermented medicinal herbs (FMH) in combination with molasses and probiotic drink (Yakult) have been used successfully as dietary supplements on a small number of rural catfish farms in Sumatra, Indonesia, for approximately two years." - Is there any data published?

The chemical composition, especially the percentage of protein and lipid in the feed provided to fish, must be clarified.

The absolute weight equation: W0 = average weight at the beginning of the study (g). Correct it.

SGR equation is not correct. The correct formula is SGR = (Ln Wt - Ln W0) / t where:

SGR = Specific Growth Rate
Ln = Natural logarithm
Wt = Weight of fish at the end of the experimental period (T)
W0 = Weight of fish at the initial of the experimental period
t = Experimental period in days

Does data meet the assumption of homogeneity of variances? Clarify if the authors ran a homogeneity test. How authors presented their results (Means ± SE or SD).

Feed utilization (FCR and feed efficiency) is not described in the result section.

Glucose is an indicator of exposure to stress, as glucose level rises with the level of stress. How do the authors explain the increased glucose level with feed additives?

Is the work clearly and accurately presented and does it cite the current literature?

Partly
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

Partly
Are all the source data underlying the results available to ensure full reproducibility?

No source data required
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: Aquaculture; Immunology; Nutrition

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

CITE

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Version 1

VERSION 1

PUBLISHED 14 Jun 2021

Views

15

Reviewer Report 31 Aug 2021

Saurav Kumar, Aquatic Environment and Health Management Division, ICAR- Central Institute of Fisheries Education, Mumbai, India

Approved with Reservations

https://doi.org/10.5256/f1000research.55942.r92787

Title:

Correct Pangasianodon spelling.

Abstract:

Write only significant results and no need to mention values of estimated parameters in this section.

Title:

Correct Pangasianodon spelling.

Abstract:

Write only significant results and no need to mention values of estimated parameters in this section.

Introduction:

Author needs to highlight the researchable problem with normal herbal immunostimulant, and why is the fermentation process required for preparing the product?

Methodology:

Fish acclimatization and standard procedure of FHM product preparation need to be mentioned with suitable references.
Statistical analysis of data needs to be mentioned.

Results:

Why do the significant change in the control group observe in RBC of 30 days sampled fish from 60 days?
Do the experimental periods have a significant effect on observed parameters?
Similar changes are also observed in haemoglobin, hematocrite values...

Discussion:

The section is well written however the mechanism need to be illustrated.

References:

Very few recent references and authors need to cite the recent findings.

Is the work clearly and accurately presented and does it cite the current literature?

Partly
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

No
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: Aquatic Environment and Health Management

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

CITE

Report a concern

Respond or Comment

Views

35

Reviewer Report 22 Jul 2021

S. M. Sharifuzzaman, Institute of Marine Sciences, University of Chittagong, Chittagong, Bangladesh

Approved with Reservations

https://doi.org/10.5256/f1000research.55942.r87441

Some specific comments:

1) Please revise title as "Fermented medicinal herbs improve hematological and physiological profiles of Striped catfish (Pangasionodon hypophthalmus)"

2) "Some researchers have reported the impact of herbal supplemented diets on hematology and innate ... Continue reading

Some specific comments:

1) Please revise title as "Fermented medicinal herbs improve hematological and physiological profiles of Striped catfish (Pangasionodon hypophthalmus)"

2) "Some researchers have reported the impact of herbal supplemented diets on hematology and innate immunity of fish" - so why were you combining molasses and probiotics? Please explain this in introduction section.

3) What were the probiotics cell numbers in different experimental diets?

4) An additional experiment with medicinal herbs, i.e. cutchery (Kaempferia galanga), turmeric (Curcuma longa) and curcuma (Curcuma zanthorrhiza) devoid of molasses, probiotic drink (Yakult) and yeast (Saccharomyces cerevisiae) would be interesting to determine the role of probiotics and prebiotics - the authors are requested to include it.

Is the work clearly and accurately presented and does it cite the current literature?

Yes
Is the study design appropriate and is the work technically sound?

Partly
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

Yes
Are all the source data underlying the results available to ensure full reproducibility?

Yes
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests: No competing interests were disclosed.

Reviewer Expertise: Aquaculture health and nutrition

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

CITE

Report a concern

Respond or Comment

Comments on this article Comments (0)

Version 3

VERSION 3 PUBLISHED 14 Jun 2021

Open Peer Review

Reviewer Status

Reviewer Reports

	Invited Reviewers
	1	2	3
Version 3 (revision) 19 Apr 22			read
Version 2 (revision) 11 Nov 21			read
Version 1 14 Jun 21	read	read

S. M. Sharifuzzaman, University of Chittagong, Chittagong, Bangladesh
Saurav Kumar, ICAR- Central Institute of Fisheries Education, Mumbai, India
Mohammed El Basuini, Tanta University, Tanta, Egypt

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Reviewer Report

7 Views

20 Apr 2022 | for Version 3

Mohammed El Basuini, Department of Animal Production, Faculty of Agriculture, Tanta University, Tanta, Egypt

7 Views Cite this report Responses(0)

Approved

The authors have included all the comments properly and no more comments.

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Aquaculture; Immunology; Nutrition

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

Respond to this report

Responses (0)

Back to all reports

Reviewer Report

11 Views

06 Jan 2022 | for Version 2

Mohammed El Basuini, Department of Animal Production, Faculty of Agriculture, Tanta University, Tanta, Egypt

11 Views Cite this report Responses(0)

Approved With Reservations

More background is required on the application of fermented plant-based diets in aquaculture.

A simple paragraph or summary on the type of fish used in terms of importance, production, or normal distribution.

"fermented medicinal herbs (FMH) in combination with molasses and probiotic drink (Yakult) have been used successfully as dietary supplements on a small number of rural catfish farms in Sumatra, Indonesia, for approximately two years." - Is there any data published?

The chemical composition, especially the percentage of protein and lipid in the feed provided to fish, must be clarified.

The absolute weight equation: W0 = average weight at the beginning of the study (g). Correct it.

SGR equation is not correct. The correct formula is SGR = (Ln Wt - Ln W0) / t where:

SGR = Specific Growth Rate
Ln = Natural logarithm
Wt = Weight of fish at the end of the experimental period (T)
W0 = Weight of fish at the initial of the experimental period
t = Experimental period in days

Does data meet the assumption of homogeneity of variances? Clarify if the authors ran a homogeneity test. How authors presented their results (Means ± SE or SD).

Feed utilization (FCR and feed efficiency) is not described in the result section.

Glucose is an indicator of exposure to stress, as glucose level rises with the level of stress. How do the authors explain the increased glucose level with feed additives?

Is the work clearly and accurately presented and does it cite the current literature?

Partly
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

Partly
Are all the source data underlying the results available to ensure full reproducibility?

No source data required
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Aquaculture; Immunology; Nutrition

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

Respond to this report

Responses (0)

Back to all reports

Reviewer Report

15 Views

31 Aug 2021 | for Version 1

Saurav Kumar, Aquatic Environment and Health Management Division, ICAR- Central Institute of Fisheries Education, Mumbai, India

15 Views Cite this report Responses(0)

Approved With Reservations

Title:

Correct Pangasianodon spelling.

Abstract:

Write only significant results and no need to mention values of estimated parameters in this section.

Introduction:

Author needs to highlight the researchable problem with normal herbal immunostimulant, and why is the fermentation process required for preparing the product?

Methodology:

Fish acclimatization and standard procedure of FHM product preparation need to be mentioned with suitable references.
Statistical analysis of data needs to be mentioned.

Results:

Why do the significant change in the control group observe in RBC of 30 days sampled fish from 60 days?
Do the experimental periods have a significant effect on observed parameters?
Similar changes are also observed in haemoglobin, hematocrite values...

Discussion:

The section is well written however the mechanism need to be illustrated.

References:

Very few recent references and authors need to cite the recent findings.

Is the work clearly and accurately presented and does it cite the current literature?

Partly
Is the study design appropriate and is the work technically sound?

Yes
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

No
Are all the source data underlying the results available to ensure full reproducibility?

Partly
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Aquatic Environment and Health Management

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

Respond to this report

Responses (0)

Back to all reports

Reviewer Report

35 Views

22 Jul 2021 | for Version 1

S. M. Sharifuzzaman, Institute of Marine Sciences, University of Chittagong, Chittagong, Bangladesh

35 Views Cite this report Responses(0)

Approved With Reservations

Some specific comments:

1) Please revise title as "Fermented medicinal herbs improve hematological and physiological profiles of Striped catfish (Pangasionodon hypophthalmus)"

2) "Some researchers have reported the impact of herbal supplemented diets on hematology and innate immunity of fish" - so why were you combining molasses and probiotics? Please explain this in introduction section.

3) What were the probiotics cell numbers in different experimental diets?

4) An additional experiment with medicinal herbs, i.e. cutchery (Kaempferia galanga), turmeric (Curcuma longa) and curcuma (Curcuma zanthorrhiza) devoid of molasses, probiotic drink (Yakult) and yeast (Saccharomyces cerevisiae) would be interesting to determine the role of probiotics and prebiotics - the authors are requested to include it.

Is the work clearly and accurately presented and does it cite the current literature?

Yes
Is the study design appropriate and is the work technically sound?

Partly
Are sufficient details of methods and analysis provided to allow replication by others?

Partly
If applicable, is the statistical analysis and its interpretation appropriate?

Yes
Are all the source data underlying the results available to ensure full reproducibility?

Yes
Are the conclusions drawn adequately supported by the results?

Yes

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Aquaculture health and nutrition

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

Respond to this report

Responses (0)

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Fermented medicinal herbs improve hematological and physiological profile of Striped catfish (Pangasianodon hypophthalmus)

Abstract

Keywords

Revised Amendments from Version 2

Introduction

Methods

Experimental diet

Fish

Use of dietary supplements

Table 1. Composition of medicinal herb mixture.

Examination of fish blood

Growth parameters

Statistical methods

Statement on animal ethics

Results

Table 2. Growth of striped catfish during the study.

Table 3. Results of measurement of striped catfish hematological profile during the study.

Table 4. Physiological profile of striped catfish during the study.

Discussion

Data availability

Acknowledgements

References

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