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The Dietary Chitosan Positively Modulates the Growth and Survival of Barbonymus Gonionotus Fry

F Islam
Department of Genetics and Fish Breeding, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

SI Paul
Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

TR Das
Department of Genetics and Fish Breeding, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

AK Barman
Department of Genetics and Fish Breeding, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

MA Rahman
Department of Genetics and Fish Breeding, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

DC Shaha
Department of Fisheries Management, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

MM Rahman
Institute of Biotechnology and Genetic Engineering, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

MA Salam
Department of Genetics and Fish Breeding, Faculty of Fisheries, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

The dietary chitosan has been largely used in the supplemental diets of terrestrial animals to improve growth and development. However, there is little information on the roles of dietary chitosan in the growth and development of aquatic animals like fish. Thus, this study aimed at determining the effects of dietary chitosan on growth performances and survival of Barbonymus gonionotus fry. A total of 600 B. gonionotus fry (2.12±0.02 g) were considered for this study. This experiment consisted of four treatments (0, 1, 2 and 3 g Kg^-1 formulated feeds) and each treatment had three replications with a stocking density of 50 fry/tank. The dietary chitosan was supplied as 8% of the bodyweight of each fry twice daily for 60 days. Fish fry treated with the dietary chitosan exhibited significant (P < 0.05) improvement in growth (body weight gain, % body weight gain, specific growth rate, and feed conversion ratio) and survival of B. gonionotus in comparison with untreated control. The water quality parameters, such as temperature, pH, and dissolved oxygen showed no significant variations and maintained a suitable range throughout the study period for fish growth. Among the treatments, the application of 1 g chitosan kg-1 feed showed the highest positive effects on growth and survival of B. gonionotus fry, indicating their potentials for practical application in promoting sustainable aquaculture.

Keywords: Diets, Aquatic animal, Formulated feeds, FCR, Fish growth

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur.

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To assess the effect of the prebiotic dietary chitosan on growth and survival of B. gonionotus fry.

Methodology:

A total of 600 (initial mean weight 2.12±0.02 g) of B. gonionotus fry were collected from a mini hatchery of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur. The fry was reared in the Wet Laboratory, Faculty of Fisheries, BSMRAU. The fry was fed with a commercial diet before starting of feeding trial. Chitosan was collected from a well-recognized pharmaceutical company named research-lab fine Chem Industries, Mumbai, India (Cat. No. 2095A). This experiment was designed according to a completely randomized design (CRD) and this experiment was divided into four treatments, including control, T₁, T_2, and T₃. Each treatment had three replicates. A total of 12 plastic tanks (300 L) were used for fry rearing and each tank was considered as a replication. Fish fry was stocked at 50 fry tank-1 by random selection. Fish fry fed feed the dietary chitosan control (0g chitosan kg^-1 diet), T₁ (1g chitosan kg^-1 diet), T₂ (2g chitosan kg^-1 diet) and T₃ (3g chitosan kg^-1 diet). The experimental system had the facility of the good inlet, outlet, aerators and shed. The indigenous ingredients (maize flour, soybean meal, mustard oil cake, and wheat flour), fish meal, and vitamin premix were used to formulate the feeds. All ingredients were ground using a blender, mixed with one another properly. The formulated feed contained about 37% protein as determined using Pearson’s square method. Then a mixture of ingredients was divided into 4 parts to use for 4 treatments. A required amount of chitosan was added to each treatment. The dough was prepared with the required amount of water. Pellets were prepared and dried under sunlight. After drying, the pellets were ground using a blender according to the mouth size of the fry. The pellet feeds were kept in an airtight container. The proximate composition of formulated feed was analyzed according to AOAC (1980). Fish fry was reared for 60 days and fed with chitosan mixed at feed 8% of body weight twice daily (9:00 AM and 17.00 PM). Uneaten feeds were collected in the morning from each tank. The water of the tank was renewed every two days. Every day the water quality parameter such as water temperature, water pH, dissolved oxygen (DO) of water were recorded. A digital DO and thermometer (LUTRON PDO-519, TAIWAN) were used to check the temperature and DO of water. A digital pH meter (EZODO, Taiwan pH 5011) was used for the measurement of pH of water. For the determination of the effects of chitosan incorporated diets in the growth of fry of fish, weight gain (WG), % BWG (percent body weight gain), SGR (specific growth rate) were measured. Feed utilization was determined by measuring FCR (feed conversion ratio). Collected data such as water quality parameters, WG, %BWG, SGR, FCR, and survival rate of fish fry were statistically analyzed using ANOVA (one-way analysis of variance) test between means. Standard deviation (±SD) was calculated to identify the range of means. All statistical analyses were performed with the aid of the computer software Statistics 10.0 version.

Source of Information: Ann. Bangladesh Agric. (2020) 24(1) : 41-50

Article Link (Online Journal): DOI: https://doi.org/10.3329/aba.v24i1.51934

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study demonstrated that the optimum level of dietary chitosan improves the growth performances and survival of the fry of B. gonionotus. Supplementation of dietary chitosan at 1 g kg^-1 feed could be recommended for the fish fry. Further investigation is required to identify the mechanisms of chitosan action in the health improvement of fish.

Knowledge Management: Journal