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Culture Feasibility of African Catfish ( Clarias Gariepinus Lin.) Fry in Glass Tank and Synthetic Hapa System Using Supplemental Diets

G.U. Ahmed
Faculty of Fisheries Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.F. Islam
Faculty of Fisheries Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.N.A. Khan
Faculty of Fisheries Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.M. Haque
Faculty of Fisheries Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M.G. Kibria
Faculty of Fisheries Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out with 1 0 days old Clarias gariepinus fry over a period of 42 days to determine the effects of different feeds on growth and survival of African catfish fry in glass tanks. The experiment was designed into four treatments each having three replications. Thus treatment 1 (T1) was named as Tank Tubifex (TT) and treatment 2 (T2) as Tank Sabinco (TS), treatment 3 as Pond Tubifex (PT), and treatment 4 (T4) as Pond Sabinco (PS). Live Tubifex (protein levels 64.48%) was supplied to treatments 1 and 3 and rest of the treatments were supplied Sabinco starter-1 (protein levels 40.13%). The highest and the lowest growth in total length and weight were 12.90 em, 18.77 g and 6.17 em, 4.04 g recorded from the treatments 3 and 2, respectively. Growth of catfish fry under treatment 3 in terms of both length and weight were significantly higher (P<0.01) than those of the other treatments. However treatment 2 showed the significantly lowest (P<0.01) growth performance among the various treatments. The highest survival rate (92%) was also obtained with treatment 3. Tubifex proved to be the best larval feed in respect of growth and survival rate.

Keywords: Bangladesh J. Fish. Res., 1 (2) : 59-66

Location: Faculty of Fisheries, Bangladesh Agricultural University

Start Date: 00-00-1994

End Date: 00-00-1994

Program Area: Knowledge Management

Commodity: Cat fish

Objectives:

To determine a suitable rearing technique of African catfish (C. gariepinus) fry using supplemental feed.

Methodology:

The proposed research work was carried out in a rectangular pond of size 0.006 hac. Twelve cultural basins were selected each' having a size of 60 X 32 X 33 em. The effective size of basins were maintained at 60 X 32 X 20 em each having 10 liters of water. Six basins were glass aquaria which were set in the laboratory and the rest were synthetic hapa having mesh size of 1.00 mm. A bamboo frame was made and placed in the pond where all the synthetic hapa were fixed with the frame in such a position that 20 em of the structure of each synthetic hapa remained below water. A small opening was kept at one topcorner of each hapa for providing feed and sampling of fry. The larvae were reared up to 10 days in metal trays and fed Tubifex and other prepared feed. the experiment was designed into four treatments each having three replications. In treatments 1 and 2 glass tanks were used where Tubifex and Sabinco starter feed were supplied having a protein level of 64.48% and 40.31% (Table 1 ). In treatments 3 and 4 synthetic hapa were used providing similar supplemental feed. Ten days old African catfish fry of initial total length of 2.90 ± 0.01 em and weight of 0.30 ± 0.01 g were released at same stocking densities i.e. 50 individuals per experimental basins. Fry were acclimatized with experimental pond water in plastic bowl· and then stocked in the synthetic hapa and glass aquaria at 1700 h on 7 July 1995. The larvae of treatments 1, 2, 3 and 4 were fed two times a day at 0800h and 1600h respectively. Feeds were supplied in excess of satiation. Two third of water from each aquarium was changed once daily in the morning before feeding. A weekly record of water quality parameters such as pH, dissolved oxygen and temperature were also maintained. The parameters were determined by pH meter (Jenway microprocessor pH meter, model no. 2050). Digital DO meter (Jenway oxygen meter, model no. 3050) and a celsius/centigrade thermometer respectively. Plankton samples were collected from the rearing pond at every 7 days interval. Ten litres of water samples were passed through the plankton net for filtration of plankton. Two plankton samples were taken at every sampling day. Two clear white plastic bottles were used for plankton preservation. The bottles had a capacity of 200 mi. Five percent formalin was used for preservation of plankton samples. The number of phytoplankton was expressed as units per liter. In that case the colonial as well as the filamentous algae each were treated as a single unit. The water of zooplankton was expressed as cells per liter. The number of larvae died in a day were recorded carefully. All the fry were counted during sampling period from both tanks and hapa. However, a final count was made at the end of the experiment. The data obtained in present experiment were analyzed statistically to see whether the effects of different feed on growth (length and weight) and health condition of fry were significant. The mean values were compared according to Duncan's New Multiple Range test at the 0.01 probability level.

Source of Information: African catfish fry, Glass tanks, Hapa, Supplemental diets

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

As a cultural basin, net cages fixed in waterbodies might be better when compared with culture in aquaria. Net cage system, are less labour intensive, low cost showing a higher growth performances in the present experiment. Thus for rearing of young catfish fry a net cage system set would be preferable.

Knowledge Management: Journal