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Preliminary Study on the Culture of Rita Rita (ham) in Freshwater Ponds

M. K. Khalilur Rahman
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

A. K. Yousuf Haroon
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

J. N. Akhter
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

G. C. Halder
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

Abstract/ Executive Summary:

A preliminary study on the mono culture of Rita rita at a stocking density of 2.000/ha was carried out for a period of six months. Some physico-chemical parameters of the pond water were recorded to find out their impact on the growth of rita. The fishes were fed on a mixed feed containing mustard oil cake 50% rice bran 30%, wheat bran 15% and molasses 5%, at the rate of 5% body weight daily (wet weight basis).The growth of R. rita was 390.0g with average increment of2.0 g/day. Survival rate and net production were 94.0% and 1.466.0 kg/ha/yr respectively. The length-weight relationship and the regression equation were established as Log W= 2.225 + 0.24 Log Land Y = - 143.10 + 17.77x, respectively. The exponential values in length-weight regression did not reveal significant relationship to the cubic law. The values of condition factor and relative condition factor were calculated.

Keywords: Performance, Fish, Pond

Location: Riverine Station, Chandpur.

Start Date: 14-06-1990

End Date: 15-12-1990

Program Area: Socio-economic and Policy

Commodity: Cat fish

Objectives:

To find out its lenght-weight relationship and condition factor.

Methodology:

The investigation was carried out from 14 June to 15 December 1990 in a 0.05 ha pond at the Riverine Station. Chandpur of the Fisheries Research Institute. A total of 100 fingerlings (Average 10.0 cm and 30.0g) were collected from the Meghna river near Chandpur ghat. The fishes were caught by box traps and transported by placing in a fibre glass tank(500 1 capacity). The fingerlings were released directly into the experimental pond without acclimatization. The stocking density was 2.000/ha. The water depth of the pond was maintained at 1.5± 0.20 m. The fingerlings were fed with a non-pelleted supplemental feed at a rate of 5% body weight per day. The feed ingredients were mustard oil cake. rice bran. wheat bran and molasses at a ratio of 50. 30. 15 and 5%respectively. Neither organic nor inorganic fertilizers were used during the culture period.Twenty per cent of the total stock was sampled once in a month and the total length (cm) and body weight (g) of fishes were recorded. Monthly data for water temperature. water depth. dissolved oxygen. free carbondioxtde and pH were recorded. Dissolved oxygen. free carbondioxide and pH were recorded by HACH water testing kit box (Model FF-1). Final harvest was done after 180 days by repeated netting. To obtain the length-weight relationship of R. rita; 50 unsexed fishes ranging from 20-35 cm in length and 120.0-450.0g in weight were randomly taken from the catch of the final harvest.

Source of Information: J. Zool. Vol. 6: (75-83) 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The fishes were fed on a mixed feed containing mustard oil cake 50% rice bran 30%, wheat bran 15% and molasses 5%, at the rate of 5% body weight daily (wet weight basis).The growth of Rita rita was 390.0g with average increment of 2.0 g/day. Survival rate and net production were 94.0% and 1.466.0 kg/ha/yr respectively. The length-weight relationship and the regression equation were established as Log W= 2.225 + 0.24 Log Land Y = - 143.10 + 17.77x, respectively. The exponential values in length-weight regression did not reveal significant relationship to the cubic law. The values of condition factor and relative condition factor were calculated.

Knowledge Management: Journal