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Effects of Different Supplementary Feeds on the Growth Performance and Survival of Labeo Bata Fry

Md. Baki Billah*
Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Suny Akter
Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Suraiya parveen
Research Fellow, Biological Research Division, Zoology Section, BCSIR

Azizur Rahman
Department of Statistics, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Lutfun Nahar
Department of Chemistry, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Md. Kamrujjaman
Department of Zoology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted with Labeo bata fry for 60 days to examine the growth performance and survival in response to three supplementary feeds i.e. wheat bran, maize bran and mixed diet. The length gain, percent length gain, weight gain, percent weight gain and specific growth of the fry were found significantly higher (p<0.05) in mixed diet. The highest survival rate (74.38±8.1%) was shown by the mixed diet treated fry which was significantly higher than those of maize bran and wheat bran treated fry respectively. There were no significant differences (p<0.05) among the treatments in term of water temperatures, pH and dissolved oxygen (DO). Thus, on the basis of the fry growth performance and survival rate, it could be suggested that the mixed diet of wheat bran and maize bran is suitable for the culture of L. bata fry.

Keywords: Labeo bata, Fry, Maize bran, Wheat bran, Growth.

Location: In the laboratory of Fish Hatchery and Research Centre, Jahangirnagar University, Bangladesh

Start Date: 00-04-2017

End Date: 00-05-2017

Program Area: Animal Health and Management

Commodity: Bata

Objectives:

In this study supplementary feeds such as wheat bran, maize bran and mixed diet of wheat bran, maize bran were used to study the growth and survival of L. bata in successful aquaculture. This study will be helpful to the hatchery owners, fish culturists and extension workers to run a hatchery effectively as well as to improve the quality fish seed and fry production in a cost effective way.

Methodology:

Fish collection and conditioning: The experiment was conducted for two months starting from first of April to the end of May 2017 in the laboratory of Fish Hatchery and Research Centre, Jahangirnagar University, Bangladesh. Healthy, mature L. bata was collected from Jahangirnagar University campus hatchery pond prior to 4 hours of induced breeding. Induced breeding: The induced breeding of L. bata was carried out as previously described (Miah et al., 2008; Hossain et al., 2007). Briefly, the females were first injected at the rate of 1.0 mg PG/kg body wt. while the second doses were performed at the rate of 5.0 mg PG/kg body wt. after 6 h from the first dose. On the other hand, the males were administered a single dose of 2 mg PG/kg body wt. at the time of second dose of the female. The male and female fishes were kept in a circular tank for natural spawning. After 8 hours the fertilized eggs were collected and the hatchings were reared in a hapa for 7 days. Preparation of feeds: About two-third water from each aquarium was replaced with deep tube well water at each alternate day. The faecal matter and wastage of food were removed by siphoning. Proper aeration was provided and was stopped during feeding. The proximate composition of wheat bran, maize bran and mixed diet (50% wheat bran + 50% maize bran) were analyzed following the standard methods given by Association of Official Analytical Chemists (AOAC, 1980). The fish were fed with extruded fish feeds at 3% of the fish body weight. Experimental design: The experiment was designed as described previously with slight modification (Ahammad et al., 2009; Moniruzzaman & Mollah, 2010 and Mahfuj et al., 2012a). Stocking: The 15 days old fry (average length 3.62±0.9mm and weight 0.008g) were taken in glass aquaria and fed with different artificial feeds to examine the growth performance in response to different diets. The experiment was conducted in nine rectangular glass aquaria (47x26x24cm) each containing 50L of deep tube well water. The experiment was designed with 3 treatments (T1, T2 and T3) each having 2 replications. The fry were released in the aquarium at the density of 4 fry/L of water i.e. 200 fry in each aquarium and reared for 60 days as described previously (Ahammad et al., 2009; Moniruzzaman & Mollah, 2010). Sampling procedure: The fish were sampled at weekly interval to determine the increase in length and weight. Sampling of fish was done early in the morning when the stomach of the fish was almost empty to avoid the biasness of fish weight due to intake of food. Fifteen (15) fry were randomly collected to take length and weight data. Weight was taken by digital analytical balance and length was measured placing the fish on 1mm graph paper. Water quality parameters: During the study period the physico-chemical parameters i.e., temperature, pH, DO and transparency of both fry rearing tank and aquarium were investigated with the help of aqua mate water testing kit (Model WAKQ-1A). All analysis was done in the fish hatchery and research centre in Jahangirnagar University. Growth parameters: For determining the growth parameters, the following formulae were used as described by Mahfuj et al., 2012b. 1) Length gain of fry (mm) = Average final length of fry – average initial length of fry. 2) Weight gain of fry (g) = Average final weight of fry – average initial weight of fry. 3) Percent gain in length= Average final length-average initial length)/ Average initial length × 100 4) Percent gain in weight = (Average final weight-average initial weight)/ Average initial weight × 100 5) Specific Growth Rate (SGR) = (lnW_f - lnW_{i x100}) / t lnW_f = the natural logarithm of the final weight, lnW_i = the natural logarithm of the initial weight, t = time (days) between lnW_f and lnW_i 6) The survival rate = (No. of fry alive/Total number of stocked) X100. Statistical analysis: All the growth parameters were tested using one-way analysis of variance (ANOVA). Significant results (p<0.05) were further tested using Duncan’s Multiple Range Test (DMRT) with the aid of the computer software SPSS 17.0 program.

Source of Information: Jahangirnagar University J. Biol. Sci. 7(1): 15-21, 2018 (June)

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Achievement/Findings:

The water temperatures, pH and dissolved oxygen recorded in this study were within the suitable range for fish culture. The highest length gain, percent length gain, weight gain and percent weight gain of the fry was found in mixed diet (50% wheat bran + 50% maize bran) which was significantly higher than those of wheat bran and maize bran treatments alone. The highest specific growth rate and survival rates were found 3.2±0.06 and 74.38±8.10% in case of fry fed with mixed diet. Therefore, depending on growth performance mixed diet (50% wheat bran + 50% maize bran) for fry rearing of L. bata could be recommended. The results of the present study clearly demonstrated that the use of low cost supplemental mixed feed (50% wheat bran + 50% maize bran) has significant role in promoting the growth of L.bata fry.

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