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Effect of Different Protein Levels of Fry Feed on the Production of Quality Tilapia (oreochromis Niloticus) Fry

K. R. Sumi
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

I. Siddika
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Das
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A 4-week long feeding experiment was conducted to evaluate the effect of different protein levels of quality Tilapia (O. niloticus) fry production in Agro-3 Fish Hatchery and Culture Farm, Boilor, Trishal, Mymensingh. Four days old 1247 fry (length 0.8 cm and weight 0.012 g) were stocked at the density of 1560/m² in twelve synthetic hapas. Four different treatments (T₁, T₂, T₃ and T₄) in three replications were used having different level of protein containing diets (T₁=35.95%, T₂=40.43%, T₃=45.61% and T₄=50.85%) in the experiment. Feeds were supplied to fry at 4 h intervals during 24 h cycle upto satiation level. Sampling was done at 7 days interval throughout the experiment. The best growth was obtained at 35.95% protein level in T₁ treatment. Therefore, a follow up second experiment with feeds having protein levels 30.12%, 33.42%, 36.19% and 39.01% encircling the best performed diet (35.95% protein) of the first experiment was conducted. Significantly (P<0.05) higher mean weight gain (g), SGR (%/day), PER, survival rate (%) and lower FCR value were found at 36.19% protein containing diet. Thus, from the results of the two experiments conducted in two consecutive years it can be said that the feed containing approximately 36% protein is the best for the production of quality tilapia fry. If farmers use 36% protein instead of 40% then it will be more economic because fish meal is costly. Further experiment can be carried with feed containing 36% protein from cheaper ingredients other than fish meal to reduce the feed cost.

Keywords: Tilapia fry, Protein levels of diets, Growth performance

Location: Agro-3 Fish Hatchery and Culture Farm, Boilor, Mymensingh.

Start Date: 25-08-2010

End Date: 22-09-2010

Program Area: Animal Health and Management

Commodity: Tilapia

Objectives:

1. To determine growth performance and survival rate of tilapia fry at different protein levels.

Methodology:

An experiment was conducted in a selected private farm called Agro-3 “Fish Hatchery and Culture Farm” located at Boilor under Trishal upazila in Mymensingh district for production of quality Tilapia (O. niloticus) fry for a period of 28 days from 25^th August to 22^nd September, 2010. Twelve same size hapas (0.81 m × 0.96 m × 1.02 m) were washed using bleaching powder and set into the pond by using bamboo sticks. Fertilized eggs were collected manually from the mouth of tilapia brood fish previously stocked in hapa set into brood pond in the farms. The fertilized eggs were transferred to hatching trays for hatching. After hatching yolk sac gradually absorbed in 4 days. Then the fry (0.012g) were stocked in experimental hapa. At first feeds were formulated containing 35%, 40%, 45% and 50% protein from three ingredients such as fish meal, rice bran and wheat flour supplied by the farm owner. Formulation of feeds was done by Pearson’s method. After formulation, feeds were prepared by mixing ingredients and proximate analysis was done. The protein levels of the prepared feeds were found 35.95%, 40.43%, 45.61% and 50.85%. All the prepared feeds were stored separately in air-tight polythene bags in the refrigerator for use during experimental period. Proximate compositions of prepared feeds were analyzed at the Fish Nutrition Lab in the Department of Aquaculture, Faculty of Fisheries. The experiment was designed into 4 treatment groups (group T₁, T₂, T₃ and T₄) fed with diet of different (35.95%, 40.43%, 45.61% and 50.85 %) protein levels. Four (4) days old 1247 fry of initial average length 0.8 cm and weight 0.012 g were released at the same stocking density (1560/m²) in each hapa on 25^thAugust, 2010. For each protein level three replications were used and fries were fed 4 h intervals during 24 h cycle. The water quality parameters of different hapas were measured at fortnightly interval throughout the experimental period. The parameters like dissolved oxygen and pH were determined by respective test kits and temperature by Celsius/ centigrade thermometer. Weekly sampling of fry were done by a scoop net and kept in a bowl with water. Weight was recorded by using a digital balance (AND GULF, Dubai, U.A.E, model: GL-300) and growth performances were calculated. The collected data were statistically analyzed by one way ANOVA (Analysis of Variance) to see whether there are differences in different treatments. The means of different parameters were compared by Duncan’s new multiple range test (DMRT) at 5% probability level.

Source of Information: J. Bangladesh Agril. Univ. 9(2): 365–374, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The feed containing 36% protein could be highly recommended for the production of tilapia fry. Further research can be carried out with 36% protein diet where protein source can be switched from fish meal to other cheaper ingredients still good enough to perform good growth and survival to reduce the fry production cost.

Knowledge Management: Journal