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Studies on the Induced Breeding and Post-larval Rearing of Shing (heteropneustes Fossilis Bloch )

J.K. Saha
Department of Aquaculture Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.A. Islam*
Department of Aquaculture Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted on induced breeding and fry rearing of shing ,Heteropneustes fossilis (Bloch) in the Department of Aquaculture, Bangladesh Agricultural University for a period of four months from April to July 1994. Hatching rate was calculated at 21.50 hrs and was found to be 45 to 55 % and the survival rate of larvae was 30 to 40 % at 26 to 29°C. Survival rate and growth rate of post larvae were found to be 50 to 60 % and 96.6 to 117.2 % respectively. Feed-3 (F 3) showed the highest survival rate and growth rate of post larvae.

Keywords: H. fossilis, Induced breeding, Larvae rearing

Location: Department of Aquaculture, Bangladesh Agricultural University

Start Date: 00-04-1994

End Date: 00-07-1994

Program Area: Variety and Species

Commodity: Fish

Objectives:

The main problem in larval rearing in the lack of suitable feed of appropriate size and quality particularly at the stage of first feeding just after utilization of yolk-mass. The present studies were undertaken with the following objectives: a) to develop an appropriate technique of induced breeding of H. fossilis and b) to formulate an artificial feed from the indigenous ingredients for fry rearing of shing.

Methodology:

Brood fish maintenance Male and female brood fishes of shing ( H. fossi/is) were stocked in the ponds of the Department of Aquaculture and Management in March 1994. The size of the stocking ponds were 60 m 2 and fishes were kept at a density of 20,000 fish/ha. The broods were given artificial feed (1 0% fish meal + 10% soya meal + 80% wheat bran) at the rate of 12 to 15% body weight twice a day. The water depth of the ponds were 1.22 to 1.53 m in the rainy season and 0.46 to 0.61 m in the winter. Ponds have outlet to prevent the overflow of the water in the rainy season. The ponds were treated with lime (at the rate of 100 kg/ha) twice a year first in May and second in November and subsequently fertilized with urea (30 kg/ha), triple superphosphate (30 kg/ha), cowdung (4,000 kg/ha) and mustered oil cake (20 kg/ha) twice a year first in May and Second in November. In the rainy season, ponds were surrounded by net as a precaution of escaping of fish from the ponds. The fishes were collected by seine net and carried to the laboratory and kept in the trays (30.48 em x 60.96 em x 15.24 em).

Induced breeding and post-larval rearing Properly ripe males and females shing (milt and eggs come out with very gentle pressure on the abdomen respectively) were selected from the brood stock. Fish were injected intramuscularly with HCG extract at a dose of 500 I.U./100g body weight. The total dose was divided into two equal doses and was injected to males and females at 6 hours interval. Male and female of a pair were kept together after each injection and aeration of water was maintained in aquaria. Care was taken to prevent fish loss by jumping. After 4 to 5 hours of 2nd injection natural ovulation was noted. Brood fish were separated from the aquaria. Fertilized eggs were incubated in trays in three replications at room temperature (26-29°C) and the aeration of water was maintained. About half of the water of each tray was changed after every six hours during incubation. The hatchling came out after 20-22 hours and dead eggs, egg covers were picked up by means of a dropper. After the completion of hatching, spawn was transferred to other trays and kept there for 4 days until the larval period was completed without feeding. After completion of the larval period, the post-larvae were transferred to the polythene-covered trays (30.48 em x60.96cm x15.24cm) at two densities of 10 post larvae/tray and 20 post larvae/tray in three replication. Three different kinds of feeds were provided to post-larvae of two different densities. Therefore, a total of eighteen trays were used for the rearing of post larvae. Three different types of foods were regarded as F1, F2 and F3

The feed was prepared in paste form. Feeds were given twice a day in the form of dough of paste at 10% of body weight. Excess feeds and wastes were removed by dropper after one hour of feeding. Half of the water along with faecal wastes from each tray was changed daily and aeration was maintained by air stones. The growth rate of post-larvae was studied for two weeks, for which the length of fish was measured to the nearest mm after each week and side by side mortality was recorded.

Statistical analysis The experiment was conducted in Randomised Block Design (RBD) with three replication and two-way analysis of variance (ANOVA) in RBD was done to study the effect of different feed and density on survival and growth rates. Duncan's Multiple Range Test (DMRT) was used for mean separation of 5% level of significance. The percentage data were arcsine transformed before statistical analysis. Data was analyzed with a statistical package called stratigraphic version 7.

Source of Information: Bangladesh}. Fish. Res., 2 (2), 1998 : 139-144

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The different densities showed that there Was no significant effect on the growth rate of shing. Similar growth rates (highest 117.24% and lowest 96.55 to 98.27% ) were recorded at both densities. The result of this study showed that the stocking density has no definite effect on the growth rate of H. fossils. The same results were obtained in Atlantic salmon (Soderberg and Meade 1987, Soderberg et al. 1987). Karjalainen (1991) reported· 60% ·survival rate of vends (Caregonus albula) at all densities.

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