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Comparative Studies on Growth and Survival of Clarias Gariepinus, Clarias Batrachus and F1 Hybrid Fry Under Laboratory Condition

M.F.A. Mollah
Department of Fisheries Biology and Limrmlogy, Bangladesh Agricultural UniversityMymensingh - 2202 Bangladesh

M.M.R . Khan
Department of Fisheries Biology and Limrmlogy, Bangladesh Agricultural UniversityMymensingh - 2202 Bangladesh

Abstract/ Executive Summary:

Fry of Clarias gariepinus (species I), Clarias batrachus (species II) and F1, hybrid were reared for a period of 28 days in nine aquaria to compare their growth rate. Twenty one laboratory induced fry of one month old for each of them were used. Initial average total length ( ±SO) of species I, species II and F, hybrid were 39.9 ± 1.03 mm, 38.7 ± 0.88 mm, 37 .8 ± 0.94 mm and weight (±SD) were 0.47 ±0.03 g, 0.42 ±0.03 g, 0.40 ±0.02 g respectively. The fry were fed with Sabinco feed at the rate of 5% of their body weight two times a day. The growth (length and wei.ghU when compared among them showed significant difference (P <0.05). Fry of species I showed bett.er growth compared to species II and there was no significant difference between the growth of species I and F1 hybrid.

Keywords: Magur, Hybrid, Growth, Survival

Location: Department of Fisheries Biology and Limrmlogy

Start Date: 00-00-1977

End Date: 00-00-1977

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To compare the growth and survival rates of C. gariepinus, C. batrachus and F1 hybrid fly.

Methodology:

Larvae of C. gariepinus, C. batrachus and F, hybrid ( female C. batrachus x male C. gariepinus ) were produced by applying induced breeding techniques. They were reared for one month before the experiment was started. The experiment was conducted with one-month old fry for 28 days with two species and one hybrid of catfishes such as C. gariepinus, C. batrachus and F, hybrid (species I, species II and F, hybrid). Twenty one fry of each species and the hybrid was used. The average initial total length ( ± SD) of fry of species I, species II and F, hybrid were 39 .9 ± 1.03 mm, 38.7 ± 0.88 mm, 37 .8 ± 0.94 mm and weight ( ± SD) were 0.47 ± 0.03 g, 0.42 ± 0.03 g, 0.40 ± 0.02 g, respectively. They were placed in nine aquaria divided into three groups ( species I, species II and F, hybrid) each having three aquaria. Volume of each aquarium was 0.46 x 0.31 x 0. 23 m3 and effective volume was 0.46 x 0.31 x 0.15 m3 having 7 L of water in each. The fry were reared by 5% daily ration of Sabinco feed. All of the fry were fed two times ( 1000 hrs, 0400 hrs·) in a day. About two third water with the dirts at the bottom was siphoned out and replaced with fresh water once a day in the morning before feeding. Water temperature fluctuated between 28 and 30°C. Sampling was performed at seven days interval. Fry were caught from aquaria by a scoop net and length (mm) and weight (g) were recorded. Analysis of variance (ANOVA) test following the principles of Completely Randomized Design was employed to compare the data obtained on growth among species I, spec ies II and F, hybrid. Duncan's New Multiple Range test was applied to find out growth (length & weight) variation among them.

Source of Information: Bangladesh J. Agr il. Sci. 24(1): 17-20, January, 1997

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In order to obtain optimal rearing efficiency, effects of feed quantity, quality and water temperature on growth rate and feed utilization at different fish size need to be known.

Knowledge Management: Journal