Gut and intestinal biometrics of the giant trevally, <i>Caranx ignobilis,</i> fed an experimental diet with difference sources of activated charcoal

Firdus Firdus; Samadi Samadi; Abdullah A. Muhammadar; Muhammad A. Sarong; Zainal A. Muchlisin; Widya Sari; Agung S. Batubara

doi:10.12688/f1000research.23788.2

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Research Article

Revised

Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoal

[version 2; peer review: 2 approved]

Firdus Firdus^1,2, Samadi Samadi ³, Abdullah A. Muhammadar⁴, [...] Muhammad A. Sarong⁵, Zainal A. Muchlisin⁴, Widya Sari¹, Agung S. Batubara⁴

Firdus Firdus^1,2, Samadi Samadi ³, [...] Abdullah A. Muhammadar⁴, Muhammad A. Sarong⁵, Zainal A. Muchlisin⁴, Widya Sari¹, Agung S. Batubara⁴

PUBLISHED 13 Oct 2020

Author details Author details

¹ Departement of Biology, Faculty of Mathematics and Natural Science, Universitas Syiah Kuala, Banda Aceh, Aceh, 23111, Indonesia
² Graduate School of Mathematics and Applied Science, Universitas Syiah Kuala, Banda Aceh, Aceh, 23111, Indonesia
³ Animal Husbandry Department, The Faculty of Agriculture, Syiah Kuala University, Banda Aceh, Aceh, 23111, Indonesia
⁴ Departement of Aquaculture, Faculty of Marine and Fishery, Universitas Syiah Kuala, Banda Aceh, Aceh, 23111, Indonesia
⁵ Departement of Biology Education, Faculty of Teacher Training and Education, Universitas Syiah Kuala, Banda Aceh, Aceh, 23111, Indonesia

Firdus Firdus
Roles: Conceptualization, Formal Analysis, Methodology, Project Administration, Resources, Writing – Original Draft Preparation

Samadi Samadi
Roles: Writing – Review & Editing

Abdullah A. Muhammadar
Roles: Supervision, Validation, Writing – Review & Editing

Muhammad A. Sarong
Roles: Supervision, Validation, Writing – Review & Editing

Zainal A. Muchlisin
Roles: Validation, Writing – Review & Editing

Widya Sari
Roles: Project Administration, Software

Agung S. Batubara
Roles: Data Curation, Software

OPEN PEER REVIEW

REVIEWER STATUS

Abstract

Background: The giant trevally, Caranx ignobilis, is a commercially important marine fish in Indonesia. This species was initially cultured in Aceh Province. Previous reports showed that charcoal has a positive effect on survival and feed utilization of the giant trevally. However, the effects of adding charcoal to the diet on gut and intestine biometrics has, to our knowledge, never been described.
Methods: Four activated charcoal sources were tested in this study using a completely randomized experimental design; coconut shell charcoal, mangrove wood charcoal, rice husk charcoal, and kernel palm shell charcoal. All treatments were performed with four replications. Juvenile giant trevally (average body weight, 16.52 ± 3.12 g; and average total length, 10.26 ± 0.64 cm) were stocked into the experimental tank at a density of 15 fish per tank. The fish were fed an experimental diet twice daily at 7 AM and 5 PM ad satiation for 42 days.
Results: Analysis of variance showed that adding charcoal to the diet had significant effects on the length and width of the foveola gastrica and villous intestine (P < 0.05). The greatest length and width of the foveola gastrica was recorded in fish fed an experimental diet of rice husk charcoal with average values of 311.811 ± 9.869 µm and 241.786 ± 10.394 µm, respectively. The greatest length of intestinal villous was found in fish fed the mangrove wood charcoal diet, with a value of 135.012 ± 5.147 µm, but this length was not significantly different to that in fish fed rice charcoal and kernel palm shell charcoal. However, the greatest width of intestinal villous was recorded in fish fed the control diet (without charcoal; P < 0.05).
Conclusion: The optimal sizes of the foveola gastrica and villous intestine were found in fish fed an experimental diet with rice husk charcoal.

Keywords

Foveola gastrica, villous intestine, coconut shell, mangrove wood, rice husk, and kernel palm shell

Corresponding author: Samadi Samadi

Competing interests: No competing interests were disclosed.

Grant information: This study was supported by Kemenristekdikti, the Republic of Indonesia through the Doctoral Dissertation Scheme, Contract Number: 17/UN11.2/PP/SP3/2018.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Copyright: © 2020 Firdus F 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: Firdus F, Samadi S, Muhammadar AA et al. Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoal [version 2; peer review: 2 approved]. F1000Research 2020, 9:444 (https://doi.org/10.12688/f1000research.23788.2) First published: 26 May 2020, 9:444 (https://doi.org/10.12688/f1000research.23788.1) Latest published: 13 Oct 2020, 9:444 (https://doi.org/10.12688/f1000research.23788.2)

Revised Amendments from Version 1

In response to comments from the reviewers, the following is our amendments:

Abstract

We changed: ‘This species was…’ to be ‘The species was…’
Four activated charcoal sources were tested in this study not include control, in the Methods has been explained with five different charcoal sources including control (no active charcoal source)
All mistake numbers in the Abstract have been adjusted based on reviewer comments

Methods and Experimental

All the mistake numbers in the Methods have been adjusted based on the reviewer comments including type mistake in the Tables and Figures

Discussion

Some sentences have been modified to make easy to understand such as “ Hence, a longer foveola gastrica and larger intestinal villi were able to provide more nutrients to be absorbed due to a larger surface area of digestive organs” and also the contain amount of rice husk charcoal has been revised. Some words have been added to make easier to understand.

See the authors' detailed response to the review by Srikanta Samanta

Introduction

Trevally fish are a commercially important group of marine fish in the family Carangidae. A total of 146 species of trevally have been recorded worldwide¹. These fish are distributed in tropical, subtropical, and temperate waters^2–7. In Indonesia, trevally fish are found in the Aceh waters^8,9, East Borneo¹⁰, Papua and Wester Nusa Tenggara^11,12, and Java¹³.

Giant trevally, Caranx ignobilis, is among the most popular trevally fish in Indonesia. The population of this species has declined over the years due to overfishing^7,14–16. Culture of this fish has been initiated in Aceh Province, Indonesia. However, farmers are faced with a feeding obstacle. Giant trevally in culture systems are currently fed waste fish and a commercial diet (Hi-Pro-Vite, Central Proteina Prima Company). The commercial diet is costly and difficult to obtain in remote areas, and the waste fish supply is very seasonal. Trash fish are limited in nutrients, particularly the essential amino acid composition¹⁷. Therefore, it is crucial to formulate a diet for giant trevally using local raw materials with higher protein, that is inexpensive, easy to find, and digestible.

Activated charcoal is commonly added to the diet to increase digestibility and trigger growth in fish. For example, Jahan et al.¹⁸ successfully used activated charcoal to increase the digestibility and growth performance of river catfish, Pangasiaodon sp. Other researchers have used charcoal in the diets of fish species, such as Nile tilapia, Oreochromis niloticus^19–21, tiger pufferfish, Takifugu rubripes²², Japanese flounder, Paralichthys olivaceus²³, African catfish, Clarias gariepinus^24,25, gilthead seabream, Sparus aurata²⁶, and sturgeon, Huso huso²⁷. Firdus et al.²⁸ added rice husk charcoal to the diet of giant trevally. However, the effect of charcoal on the morphology of the gut and intestine has not been reported.

Organogenesis of the digestive system occurs as fish age, and this process is strongly dependent on the quantity and quality of food^29–32, which is related to the development of mucosal cells, amplification of apical plasma membranes, and formation of the foveola gastrica and intestinal villi^33,34. It has been hypothesized that adding activated charcoal to the diet triggers the digestive organogenesis system process^35,36. In this study, we tested four charcoal sources in the diet to evaluate the morphology of the gut and intestine of giant trevally. Information on the gut and intestinal morphology is important to understand the absorption mechanism of nutrients from the diet.

Methods

Time and site

The study was conducted at the Center for Brackish Water Aquaculture, Ujung Batee, Aceh, Indonesia from February to July 2018. The activated charcoal was characterized at the Integrated Laboratory of Calibration, Universitas Gajah Mada, Yogyakarta, Indonesia. Histological samples were prepared at the Laboratory of Histology, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh, Indonesia.

Experimental design

A completely randomized experimental design with five treatments consisting of control and four different charcoal sources was used in this study. The experimental groups were: (A) the experimental diet without charcoal, (B) the experimental diet with 2% charcoal from coconut shell, (C) the experimental diet with 2% charcoal from mangrove wood, (D) the experimental diet with 2% charcoal from rice husk, and (E) the experimental diet with 2% charcoal from kernel palm shell. All treatments were performed with four replications.

Experimental fish

A total of 300 giant trevally juveniles of mixed sex (average body weight, 16.52 ± 3.12 g; total length, 10.28 ± 0.64 cm) were purchased from a local farmer in Lancang Barat Village, Aceh Utara District, Aceh, Indonesia. The fish were acclimatized in ponds (ponds size 2 m x 1.8 m and temperature of around 29°C) at the Center for Brackish Water Aquaculture, Ujung Batee for 2 weeks. The fish were fed an experimental diet containing 50% crude protein twice daily at 7 AM and 5 PM at 3% of body weight per day (Table 1).

Table 1. The composition of raw materials in the experimental diet (g kg⁻¹) with 50% crude protein.

Raw materials	Crude protein (%)	Composition (g kg⁻¹)
Raw materials	Crude protein (%)	Diet without charcoal (Diet A, Control)	Diet with charcoal (Diet B, C, D, E)
Ebi-shrimp meal	58.80	50	50
Fish meal	59.00	660	660
Rice flour	7.26	180	160
Soybean meal	45.06	20	20
Bloodmeal	71.00	20	20
Corn flour	6.48	10	10
Coconut oil	0	5	5
CaCO3	0	5	5
Isoleucine	100	10	10
L-Tryptophan	100	17.5	17.5
DL-Methionine	100	17.5	17.5
Mineral mix	0	5	5
Active charcoal	0	-	20
Total material		1000	1000
Total crude protein		50%	50%

Note: (A) diet without charcoal, (B) diet with charcoal from coconut shells, (C) diet with charcoal from mangrove wood, (D) diet with charcoal from rice husks, (E) diet with charcoal from kernel palm shells.

Charcoal preparation and activation

The raw coconut shells, mangrove wood, rice husks, and kernel palm shells were chopped and ground. Approximately 500 g of the ground materials were placed on aluminum foil and heated in a furnace at 400°C for 1 hour. Nitrogen gas was flowed into the furnace to remove the oxygen. Then, the temperature was decreased to 30°C gradually and held for 1 hour. After 1 hour, the charcoal was removed from the furnace, sieved through a No. 40 mesh, and held in a jar before activating. A total of 100 g of sieved charcoal was taken and mixed with 400 ml of 0.2 M citric acid. The solution was stirred for 24 hours. After 24 hours, the solution was filtered through filter paper. The filtered charcoal was washed with distilled water and dried in an oven at 110°C for 24 hours.

Diet preparation

The experimental diet was formulated from both plant and animal-based protein sources, such as Ebi-shrimp meal, fish meal, blood meal, soybean meal, rice flour, and corn flour. All raw materials were subjected to a proximate analysis before use in the formulation. Three types of amino acids i.e. isoleucine, L-tryptophan, and DL-methionine were also added (Table 1). A total of 2% of the tested charcoal sources was added to the formulation (Table 1). The formulated diets were subjected to a proximate analysis before use in the experiment.

Stocking and feeding

The fish was captured randomly, measured for body weight and total length, and then distributed into 20 plastic containers (48 × 43 × 70 cm) at a stocking density of 15 fish per container. The water volume in the container was 75 L. The fish were fed an experimental diet twice daily at 7 AM and 5 PM to satiation for 42 days.

Histological sample preparation

Gastric and intestinal samples were collected at the end of the study. Three fish from each treatment were taken randomly from the experimental tanks. The fish were anesthetized with 30 mg L⁻¹ clove oil³⁷, and the abdomen of the fish was gently dissected following the procedure of Purushothaman et al.³⁸. The stomach and intestines were removed with scalpel scissors and preserved in 4% formalin for 1 week. Histological sampling was carried using the paraffin method based on Osman and Caceci³⁹. The samples were dehydrated through an alcohol series and cleared in xylol. Subsequently, the gut and intestine samples were embedded in paraffin. The paraffin block was sectioned to 6 µm, and the sections were stained with hematoxylin and eosin. The size (height and width) of villi was determined using a binocular microscope (Zeiss Primo Star, Carl Zeiss Suzhou Co., Ltd., Suzhou, China) which was connected to a CCD camera and computer monitor¹⁹. All efforts were made to lessen harm to the animals by complying to the guidelines of ethics animal use in research of Syiah Kuala University.

Data analysis

The qualitative gut and intestinal morphology data were subjected to one-way analysis of variance followed by Duncan’s multiple range test. The analysis was performed using SPSS ver. 18.0 software. The qualitative (histological) gut and intestinal data were analyzed descriptively. A P-value < 0.05 was considered significant.

Results

Adding activated charcoal to the diet significantly affected the length and width of the foveola gastrica and intestinal villi (P < 0.05). In general, fish fed the activated charcoal diets produced better results than those not fed the charcoal (Figure 1 and Figure 2). The best foveola gastrica morphology was obtained with the rice husk charcoal and the mean length and width of the foveola gastrica were 311.811 µm and 241.786 µm, respectively; followed by coconut shell charcoal (257.040 µm and 183.816 µm), kernel palm charcoal (229.969 µm and 169.131 µm µm), and mangrove wood charcoal (229.595 µm and 166.509 µm).

Figure 1. The average of length and width of the foveola gastrica.

(A) Diet without charcoal, (B) diet with coconut shell charcoal, (C) diet with mangrove wood charcoal, (D) diet with rice husk charcoal, (E) diet with kernel palm shell charcoal.

Figure 2. Histology of foveola gastrica from a juvenile giant trevally.

(A) Diet without charcoal, (B) diet with coconut shell charcoal, (C) diet with mangrove wood charcoal, (D) diet with rice husk charcoal, (E) diet with kernel palm shell charcoal. M, tunica mucosa; SM, tunica submucosa; Mc, tunica muscularis; Le, lamina epithelialis; Lp, lamina propria; m, muscle; Lm, longitudinal muscle fibers; Cm, circular muscle fibers (Cm).

The greatest length of the villous intestine was recorded in fish fed a diet with activated charcoal than those not fed the activated charcoal (Figure 3). The greatest growth of intestinal villi was determined in the mangrove active charcoal (mean, 135.012 µm) group, but this value was not significantly different from the rice husk or kernel palm shell charcoals (Figure 4). However, the greatest intestinal villi width was obtained in the treatment without activated charcoal (38.341 µm), and this value was significantly different from the other treatments.

Figure 3. The average length and width of intestine villi from juvenile giant trevally.

(A) Diet without charcoal, (B) diet with coconut shell charcoal, (C) diet with mangrove wood charcoal, (D) diet with rice husk charcoal, (E) diet with kernel palm shell charcoal.

Figure 4. Histology of intestinal villi from a giant trevally juvenile.

Raw biometic data, in addition to unprocessed imaged, are available as Underlying data^40–42.

Discussion

The results show that adding activated charcoal to the diet of C. ignobilis significantly affected favoela gastrica and intestinal villi biometrics. According to Pirarat et al.¹⁹, activated charcoal plays a significant role stimulating the development of epithelial cells of the digestive organs. Activated charcoal in the diet functions as a decontaminating agent to eliminate pathogenic organisms and toxic compounds, such as mycotoxins²⁰. Hence, a longer foveola gastrica and larger intestinal villi were able to provide more nutrients to be absorbed due to a larger surface area of digestive organs⁴³. Optimal development of the alimentary tract was recorded in giant trevally juveniles fed the experimental diet containing rice husk charcoal. This was presumably due to the high hemicellulose, cellulose, and lignin contents in the rice husk charcoal. A previous report indicated that rice husk charcoal contains 29.3% hemicellulose, 34.4% cellulose, and 19.2% lignin⁴⁴, while mangrove wood charcoal has 30% hemicellulose, 36% cellulose, and 28% lignin⁴⁵, coconut shell charcoal has 19.27% hemicellulose, 33.61% cellulose, and 36.51% lignin⁴⁶, and kernel palm shell charcoal has 26.27% cellulose, 12.61% hemicellulose, and 42.96% lignin⁴⁷. Maria and Banu⁴⁸ and Jamilatun et al.⁴⁹ reported that the concentration and quality of charcoal depend on the composition of hemicellulose, cellulose, and lignin. The quality of the activated charcoal is higher when these three components increase. According to Jasman⁵⁰, rice husk contains 85–95% activated charcoal, while mangrove wood has 76% activated charcoal⁵¹, kernel palm shell 65% activated charcoal⁴⁷, and coconut shell has 60% activated charcoal⁴⁶.

The microscopic observations showed that the intestinal villi of the fish fed the diet with activated rice husk charcoal had a more pointed shape compared to other treatments, in which the villi tended to be round and blunt. According to Guo et al.⁵², blunt or rounded villi probably occur due to inflammation in the intestinal mucosa, which is characterized by infiltration of neutrophils into the lamina propria. An increase of intestinal villus size is related to nutrient absorption capacity. According to Nafis et al.⁵³, long mucosal folds increase nutrient absorption and reduce food flow movement due to reduced peristaltic contractions, which provides sufficient time to optimally absorb nutrients. The increase in intestinal villi size is strongly related to the activities of digestive enzymes, such as lactase, sucrase, alkaline phosphatase, and disaccharidase^54–57.

The morphology of the intestinal villi of fish fed a diet without activated charcoal was wider and shorter than that of fish fed the diets with activated charcoal. This was probably due to impaired intestinal mucosal integrity, causing interference in nutrient absorption. According to Choct⁵⁸, shortening of the intestinal villi is related to the accumulation of intestinal pathogenic bacteria, resulting in increased susceptibility to infection in the intestinal mucosal layer. This causes the digestive organs to form more secretory cells than absorbent cells, which reduces nutrient uptake^59,60. The active charcoal likely acts as an adsorbent of metabolic pathogens in the intestine in the form of endotoxins and ammonia, therefore, it was able to improve intestinal function⁶¹.

Conclusions

The application of activated charcoal in the diet significantly affected the length and width of the foveola gastrica and intestinal villi of giant trevally, C. ignobilis. The optimal biometrics of the foveola gastrica and intestinal villi were observed in fish fed the experimental diet with activated rice husk charcoal.

Data availability

Figshare: Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoal. https://doi.org/10.6084/m9.figshare.12203525.v2⁴⁰.

This project contains the following underlying data:

DATA BIOMETRIC GUT OF GIANT TREVALLY Caranx ignobilis_Edited (XLSX). (Raw biometric data for the foveola gastrica of all fish examined in this study.)
DATA BIOMETRIC OF INTESTINE OF GIANT TREVALLY Caranx ignobilis_edited (XLSX). (Raw biometric data for the intestinal villi of all fish examined in this study.)

This project contains uncropped, unprocessed images of the intestinal villi of giant trevally.

Figshare: Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoaltem. https://doi.org/10.6084/m9.figshare.12269606.v2⁴².

This project contains uncropped, unprocessed images of the foveola gastrica of the giant trevally.

Data are available under the terms of the Creative Commons Attribution 4.0 International license (CC-BY 4.0).

Acknowledgments

We thank the Kemenristekdikti for supporting this study. All staff at the Center for Brackish Water Aquaculture in Ujung Batee who assisted with this study are acknowledged. Special thanks to Mr. Boihaqi and Maisyarah Rita for their assistance during the study.

Faculty Opinions recommended

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Version 2

VERSION 2 PUBLISHED 26 May 2020

Author details Author details

Firdus Firdus
Roles: Conceptualization, Formal Analysis, Methodology, Project Administration, Resources, Writing – Original Draft Preparation

Samadi Samadi
Roles: Writing – Review & Editing

Abdullah A. Muhammadar
Roles: Supervision, Validation, Writing – Review & Editing

Muhammad A. Sarong
Roles: Supervision, Validation, Writing – Review & Editing

Zainal A. Muchlisin
Roles: Validation, Writing – Review & Editing

Widya Sari
Roles: Project Administration, Software

Agung S. Batubara
Roles: Data Curation, Software

Competing interests

No competing interests were disclosed.

Grant information

This study was supported by Kemenristekdikti, the Republic of Indonesia through the Doctoral Dissertation Scheme, Contract Number: 17/UN11.2/PP/SP3/2018.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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https://doi.org/10.12688/f1000research.23788.2

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https://doi.org/10.12688/f1000research.23788.1

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Firdus F, Samadi S, Muhammadar AA et al. Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoal [version 2; peer review: 2 approved]. F1000Research 2020, 9:444 (https://doi.org/10.12688/f1000research.23788.2)

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Reviewer Report 13 Oct 2020

Abdus Salam, Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

Approved

https://doi.org/10.5256/f1000research.28490.r72869

Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with ... Continue reading

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Reviewer Report 10 Jul 2020

Abdus Salam, Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

Approved

https://doi.org/10.5256/f1000research.26249.r65152

It seems the manuscript has potentials in the scientific world, and work was done and formatted with care. The abstract is concise but well written.
The introduction has supported with up to

It seems the manuscript has potentials in the scientific world, and work was done and formatted with care. The abstract is concise but well written.
The introduction has supported with up to date literature and aim and objectives are well described.
Results supported with details and tables and figures were provided.
The discussion was also well described and literature supported.

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?

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

Yes
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

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.

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Reviewer Report 15 Jun 2020

Srikanta Samanta, Principal Scientist & Head (Acting) Riverine Ecology and Fisheries Division, ICAR-Central Inland Fisheries Research Institute, Barrackpore, India

Approved

https://doi.org/10.5256/f1000research.26249.r63939

The paper has communicated a short but interesting study on the beneficial effects of adding different types of charcoal as a dietary component of giant trevally. The addition of charcoal has significantly improved the gastro-intestinal microstructures including foveola gastrica & villous intestine and thereby, has the potentiality to improve the fish nutrition and health. The rice husk was recorded as the best source of charcoal with respect to 3 other sources including coconut shell, mangrove wood, and kernel palm shell. However, some deficiencies have been noticed which needs rectification.

In Abstract : This species was---: Better to use The species was---
Four activated charcoal sources were tested in this study -----but in Experimental Design mentioned ----A completely randomized experimental design with five different charcoal sources----
In Abstract : average total length, 10.26 ± 0.64 cm, In Experimental fish : total length, 10.28 ± 0.64 cm
ponds size 2 x 1.8 m. No unit given after 2. It may be 2 m X 1.8 m
(see Table 1) : see may be deleted
Table 1 : CaCo3 : CaCO3
In Abstract : and 241.786 μm --- In Figure 1 241.768
Figure 2 and 4 : Histological sample ---- may be replaced by ---- Histology
Sentence to be modified : Hence, a longer foveola gastrica and larger intestinal villi provide a larger surface area to absorb nutrients43.
Sentence to be modified : A previous report indicated that rice husk charcoal contains 39% hemicellulose, 44% cellulose, and 30% lignin44 : Since the addition of 3 parameters are giving values >100%, you may mention "up to" otherwise people will not understand.
Sentence to be modified/changed : The active charcoal likely acts as an adsorbent of metabolic pathogens in the intestine in the form of endotoxins and ammonia to improve intestinal function61. The sentence to be rewritten to increase clarity.
It has been noticed that the SE values have gone out of the bar area. Please check about it and reason behind. For the paper, the fish growth parameters may be given as supplements for better clarity.

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?

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

Yes
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: Aquatic Chemistry

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.

CITE

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Author Response 22 Jul 2020

Samadi Samadi, Animal Husbandry Department, The Faculty of Agriculture, Syiah Kuala University, Banda Aceh, 23111, Indonesia

22 Jul 2020

Author Response

Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Competing Interests: No competing interests were disclosed.
Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Competing Interests: No competing interests were disclosed. Close
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Author Response 22 Jul 2020

Samadi Samadi, Animal Husbandry Department, The Faculty of Agriculture, Syiah Kuala University, Banda Aceh, 23111, Indonesia

22 Jul 2020

Author Response

Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Competing Interests: No competing interests were disclosed.
Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Dear Prof. Srikanta Samanta,
Thank you very much for your comment and we will revise the article based on your suggestions.
Best regards,
Samadi
Competing Interests: No competing interests were disclosed. Close
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Srikanta Samanta, ICAR-Central Inland Fisheries Research Institute, Barrackpore, India
Abdus Salam, Bangladesh Agricultural University, Mymensingh, Bangladesh

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Reviewer Report

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13 Oct 2020 | for Version 2

Abdus Salam, Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

8 Views Cite this report Responses(0)

Approved

Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with different sources of activated charcoal.

The title should be different not difference. Others are fine.

Competing Interests

No competing interests were disclosed.

Reviewer Expertise

Aquaculture, Aquaponics, fish nutrition

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10 Jul 2020 | for Version 1

Abdus Salam, Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

17 Views Cite this report Responses(0)

Approved

It seems the manuscript has potentials in the scientific world, and work was done and formatted with care. The abstract is concise but well written.
The introduction has supported with up to date literature and aim and objectives are well described.
Results supported with details and tables and figures were provided.
The discussion was also well described and literature supported.

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?

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

Yes
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

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.

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Reviewer Report

23 Views

15 Jun 2020 | for Version 1

Srikanta Samanta, Principal Scientist & Head (Acting) Riverine Ecology and Fisheries Division, ICAR-Central Inland Fisheries Research Institute, Barrackpore, India

23 Views Cite this report Responses(1)

Approved

In Abstract : This species was---: Better to use The species was---
Four activated charcoal sources were tested in this study -----but in Experimental Design mentioned ----A completely randomized experimental design with five different charcoal sources----
In Abstract : average total length, 10.26 ± 0.64 cm, In Experimental fish : total length, 10.28 ± 0.64 cm
ponds size 2 x 1.8 m. No unit given after 2. It may be 2 m X 1.8 m
(see Table 1) : see may be deleted
Table 1 : CaCo3 : CaCO3
In Abstract : and 241.786 μm --- In Figure 1 241.768
Figure 2 and 4 : Histological sample ---- may be replaced by ---- Histology
Sentence to be modified : Hence, a longer foveola gastrica and larger intestinal villi provide a larger surface area to absorb nutrients43.
Sentence to be modified : A previous report indicated that rice husk charcoal contains 39% hemicellulose, 44% cellulose, and 30% lignin44 : Since the addition of 3 parameters are giving values >100%, you may mention "up to" otherwise people will not understand.
Sentence to be modified/changed : The active charcoal likely acts as an adsorbent of metabolic pathogens in the intestine in the form of endotoxins and ammonia to improve intestinal function61. The sentence to be rewritten to increase clarity.
It has been noticed that the SE values have gone out of the bar area. Please check about it and reason behind. For the paper, the fish growth parameters may be given as supplements for better clarity.

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?

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

Yes
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

Aquatic Chemistry

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 (1)

Alongside their report, reviewers assign a status to the article:

Approved - the 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 approved - fundamental flaws in the paper seriously undermine the findings and conclusions

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Gut and intestinal biometrics of the giant trevally, Caranx ignobilis, fed an experimental diet with difference sources of activated charcoal

Abstract

Keywords

Revised Amendments from Version 1

Introduction

Methods

Time and site

Experimental design

Experimental fish

Table 1. The composition of raw materials in the experimental diet (g kg−1) with 50% crude protein.

Charcoal preparation and activation

Diet preparation

Stocking and feeding

Histological sample preparation

Data analysis

Results

Figure 1. The average of length and width of the foveola gastrica.

Figure 2. Histology of foveola gastrica from a juvenile giant trevally.

Figure 3. The average length and width of intestine villi from juvenile giant trevally.

Figure 4. Histology of intestinal villi from a giant trevally juvenile.

Discussion

Conclusions

Data availability

Acknowledgments

References

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Table 1. The composition of raw materials in the experimental diet (g kg⁻¹) with 50% crude protein.