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Effects of Fry Stocking Densities on Growth, Survival Rate and Production of Hypophthalmichthys Molitrix, Cyprinus Carpio Var. Specularis and Labeo Rohita in Earthen Ponds at Natore Fish Farm, Natore, Bangladesh

Md. Istiaque Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi-6205, Bangladesh.

Jesmin Ara
Department of Fisheries, Faculty of Agriculture, University of Rajshahi-6205, Bangladesh.

B. M Mostafa Kamal
Natore Government Fish Farm, Natore, Bangladesh.

Anannya Sen Tumpa
Department of Fisheries, Faculty of Agriculture, University of Rajshahi-6205, Bangladesh.

Md. Yeamin Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

The experiment was conducted to determine the effects of fish population density on the growth and production of carps fries (Silver carp, Mirror carp and Rui) in polyculture for a period of 90 days in earthen ponds. Mean individual stocking weight (wt) (g) of the fry of silver carp, mirror carp and rui were 0.10, 0.103 and 0.08 under treatment-I and were 0.17, 0.142 and 0.11 under treatment-II. In the ponds under both treatments, inorganic and supplementary balanced feed (50% per body weight) was used to the cultured ponds for spawn to fish fingerlings. During the experimental period, the ranges of water temperature (26 to 34⁰C), transparency (28 to 41 cm), dissolved oxygen (2.45 to 5.5 mg/L), pH (7.0 to 8.5), total alkalinity (130 to 182 mg/L), and ammonia nitrogen (0.12 to 0.3 mg/L) found were within the productive limit and more or less similar in all the ponds under treatment-I and II. The survival rate of silver carp was 38.60 and 66.48 under treatments I and II. The survival rate of mirror carp was 31.20% and 45.50% under treatment I and II and the survival rate of rui was 31.51% and 53.35% under treatment I and II, respectively. The calculated net fish production of the ponds under treatment-I was 1905.13±141.95 kg ha^-1 90d^-1 and that of the ponds under treatment-II was 3831.74±411.35 kg ha^-1 90d^-1. It was found that net fish growth, survival rate and productions was better in treatment-II than treatment- I. Finally it is concluded that the growth, survival rate and production of fry up to fingerlings would be better by intervention of proper stocking density of various fish species in pond fish culture.

Keywords: Fish Population Density, Water Quality Parameter, Survival Rate, Specific Growth Rate, Fish Production

Location: Sadar Upazila, Natore district, Bangladesh.

Start Date: 00-04-2012

End Date: 00-06-2012

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To evaluate the suitable stocking density of Hypophthalmichthys molitrix, Cyprinus carpio var. specularis and Labeo rohita and determine the survival, growth rate and production of carps spawn in the ponds.

Methodology:

Study period and site: The research was carried out at the Banbelgharia, the Government fish seed production farm, Natore Sadar Upazila under Natore district, Bangladesh for a period of 3 months (April to June, 2012) in six experimental fish ponds. Each pond has inlet for watering but no outlet. The ponds were dependable on rainfall and deep tube well water. Experimental design: The experiment was conducted in Completely Randomized Design (CRD). The ponds were two treatments each having three replications. Under treatment-I, the population density of Silver carp, Mirror carp and Rui was 7817 fry/decimal (i.e. 2432 silver carp + 2425 mirror carp + 2960 Rui) and under treatment-II fish population density was 6253 per decimal (1945 silver carp + 1940 mirror carp + 2368 Rui). Pond preparation, stocking and fertilization: Ponds under the treatment I were new made and the Treatment II were renovated, dried and cleaned of aquatic vegetation manually. Liming (Cao) was done in all the ponds at rate 1 kg/decimal before 7 days of fertilization. Seven days after liming, Urea and Triple Super Phosphate (TSP) were applied at the rate of 100g/decimal and 100g/decimal respectively as initial doses. Sumithion was done in all the ponds at rate 100 ml/decimal after watering. Fertilization of the ponds under treatment I and treatment II was done with the application of Urea (4 kg/decimal) and triple super phosphate (2 kg/ decimal). TSP was dissolved in water for 24 hours in a plastic bucket and then applied by spreading over the pond surface. Urea was dissolved in a bucket and then applied by spreading with a mug on the pond surface. Fertilization was done fortnightly. Water quality parameters: Water quality parameters such as water temperature (⁰C), pH, dissolved oxygen (mg/L), total alkalinity (mg/L)), transparency (cm), were recorded between 10 AM and 12 PM. Water temperature was recorded using a Celsius thermometer at 15-20 cm depth. Water transparency was measured by a Secchi-disk. Dissolved oxygen was measured by the aid of a water quality test kit (HACH kit model FF-2, made in USA). The negative logarithm of the hydrogen ion concentration or pH of water was measured by using HACH kit (model FF-2, cat. No. 2430-01, made in USA).Total alkalinity (mg/L) was determined by titrimetric method using methyl orange indicator. Statistical analysis: Water quality, growth, survival rates (%) and fish production were subjected to using computer Microsoft Office and Excel.

Source of Information: International Journal of Fisheries and Aquatic Studies 2014; 2(1): 106-112

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

All of the physico-chemical parameters of the ponds under treatment-I and treatment-II were more or less similar but the higher production of fish was recorded under treatment-II (where fish population density was 6253 per decimal) than that of treatment-I (where fish population density was 7817 per decimal). Stocking wt of fishes in treatments I and II was same but size of the fishes in treatment-II was some large and there was no competition among food, suitable environment, oxygen requirements etc. In this case specific growth rate of carp species was high and production was better. So, the lower fish population density was more suitable and better and did not affect fish production. In case of higher fish population densities, fish population was together and was competition among food, environment and oxygen requirements.

Knowledge Management: Journal