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Effect of Dietary Vitamin E on Growth and Survival Rate of the Giant Freshwater Prawn Macrobrachium Rosenbergii

MD. FAZLE ROHANI
Department of Aquaculture Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MONORANJAN DAS
Department of Aquaculture Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

MD. SAZZAD HOSSAIN
Department of Aquaculture Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

The experiment was carried out to evaluate the effect of dietary vitamin E on the growth and survival rate of freshwater prawn (Macrobrachium rosenbergii) for a period of 10 weeks. PL of the initial weight of 0.18±0.03g was released at stocking density of 265/m³. Four different treatments (T1, T2, T3 and T4) having different amount of vitamin E such as 1000 mg vitamin E/kg feed (T2), 2000 mg vitamin E/kg feed (T3), and 3000 mg vitamin E/kg feed (T4) where 0 mg vitamin E/kg feed (T1) was considered as control. Final weight (g), weight gain (g), specific growth rate (%/day) and protein efficiency ratio (PER) varied from 1.0 ± 0.02 to 1.20 ±0.01, 0.86±0.02 to 1.02±0.01, 476.38±11.81 to 564.21±5.54, 2.50±0.03 to 2.70±0.01 and 1.75±0.15 to 1.86±0.23, respectively. The highest survival rate (95.53 ± 1.03) was found in T4 and the lowest was (88.87±1.98) in T1. Best growth performance and survival rate was found in T4 followed by T3, T2 and T1. The study suggests that the best growth performance and survival rate of prawn can be obtained from supplementation of 3000 mg vitamin E/kg feed containing diet.

Keywords: Keywords: Macrobrachium rosenbergii, Vitamin E

Location: The wet laboratory, Faculty of Fisheries, Bangladesh Agriculture University, Mymensingh, Bangladesh

Start Date: 03-08-2018

End Date: 12-10-2018

Program Area: Animal Health and Management

Commodity: Prawn, Vitamin

Objectives:

To determine the effect of different levels of vitamin E on the growth performances and survival rate of M. rosenbergii.

Methodology:

Experimental design: The research work was undertaken in 12 glass aquaria (each contained 60L) at the wet laboratory, Faculty of Fisheries, Bangladesh Agriculture University, Mymensingh. The size of each aquarium was 61×30.50×39.59cm3. Stored ground water was used for rearing the prawn. The glass aquaria were divided into four treatments T1, T2, T3 and T4 with three replications of each. An adequate level of dissolved oxygen in each aquarium was maintained through artificial aeration. Partial change of water from each aquarium was done daily during the removal of uneaten feed and faces. Sample collection and acclimatization: PL of M. rosenbergii was collected from Fish Seed Multiplication Farm, Shambhuganj, Mymensingh. Transportation of PL was done in oxygen bag to avoid stress and injury. During three days of acclimatization period, adequate oxygen supply was maintained through artificial aeration and PL were fed formulated pelleted feed. The PL were randomly distributed at a rate of 15 per aquarium. Feed formulation: The ingredients used for preparation of basal experimental diets along with their proximate composition are shown. Four levels of vitamin E (α-tocopherol acetate) were tested in this study. Diets of T1, T2, T3 and T4 contained 0 mg, 1000 mg, 2000 mg and 3000 mg vitamin E/kg respectively. α-tocopherol acetate was supplemented separately to the basal diet at the expense of wheat bran. The ingredients were ground, milled, weighed, mixed, dough of feed ingredients made and pelleted with meat mincer through a 0.5 mm diameter. After pelleting, the feed were air dried and put in an air-tight container. All diets were stored at -20°C until fed. Experimental procedure: The experiment was conducted for 10 weeks (from 03 August to 12 October, 2018). Initial weight of M. rosenbergii was 0.18g. Feeding was done once daily at 6.30 pmat the rate of 15% for first two weeks, 10% for following two weeks, 5% of the body weight for rest of the experimental period. About 50% water was changed daily at 9.00 am. Initial and final weight of prawn in each aquarium was recorded. The weight was measured biweekly to keep the record. Estimation of growth performance: The growth performances of M. rosenbergii in terms of final weight (g), weight gain (g), specific growth rate (%/day), feed conversion ratio (FCR), feed conversion efficiency (FCE) and protein efficiency ratio (PER) were calculated at the end of the experiment. Water quality parameters: The water quality parameters such as water temperature, dissolved oxygen (DO), pH were monitored biweekly throughout the experimental period to evaluate the environmental quality of aquaria. Data analysis: The collected data were analyzed by Microsoft Excel and XL-Stat (version 2013) analytical tool which was used to perform statistical analysis as one way ANOVA. The means of different treatment were compared by Duncan Multiple Range Test (Duncan, 1955) to test the significance of variation between the treatment means at p<0.05.

Source of Information: Bangladesh J. Fish. (2019) 31(1) : 49-54

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The dissolved oxygen content from present experiment ranged from 8.3 to 9.4 mg/l. Zafar et al. (2015) observed that the dissolved oxygen level ranged from 7.67±0.33 to 9.67±1.68 mg/L is suitable for prawn and shrimp culture. Other studies reported that the optimum range of dissolved oxygen for shrimp and prawn is >4 ppm which is very similar to the finding of the present study (DoF 2009). During the study period, the pH value was 7.98 to 8.20. Zafar et al. (2015) observed that the pH level ranged from 8.17±0.17 to 8.37±0.08 is suitable for prawn and shrimp culture. The pH values recorded in the present study were within suitable range for prawn culture. So, all the water quality parameters measured were suitable for prawn culture and did not have any negative effect on growth of prawn. The result of the present study revealed that the best growth performance and survival rate of M. rosenbergii were obtained with supplementation of 3000 mg/kg feed that could be recommended for prawn PLs rearing. Further research should be carried out in pond system to observe growth, survival rate and histological parameters of prawn to find out the optimum level of vitamin E per kg feed which could be chosen by the fish farmers and feed manufacturers.

Knowledge Management: Journal