International Journal of Fisheries and Aquatic Research

International Journal of Fisheries and Aquatic Research


International Journal of Fisheries and Aquatic Research
International Journal of Fisheries and Aquatic Research
Vol. 6, Issue 1 (2021)

Study the optimization of stocking density of tilapia and carps in poly-culture system at earthen ponds of Bapard campus of Gopalganj district


MM Nabi

An experiment was conducted to determine the growth and production of tilapia (Oreochromis niloticus) with rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus mrigala) and silver carp (Hypophthalmichthys molitrix) in poly-culture system for a period of 135 days at nine earthen ponds. The experiment was carried out under three treatments each with three replications. The stocking density was 220 fingerlings per decimal (tilapia 200, rohu 5, catla 5, mrigal 5 and silver carp 5) under T1, 270 fingerlings per decimal (tilapia 250, rohu 5, catla 5, mrigal 5 and silver carp 5) under T2 and 320 fingerlings per decimal (tilapia 300, rohu 5, catla 5, mrigal 5 and silver carp 5) under T3. The average initial length and weight of the fingerlings of tilapia (Oreochromis niloticus), rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus mrigala) and silver carp (Hypophthalmichthys molitrix) were 2.15±0.10 cm, 6.10±0.30 cm, 7.81±0.23 cm, 6.15±0.54 cm, 5.20±0.42 cm and 7.50±0.16 g, 23.50±0.14 g and 20.12±0.15 g, 19.20±0.18 g, 21.25±0.17 g respectively. The ponds were fertilized fortnightly with urea and TSP at the rates of 100 g and 50 g per decimal respectively. Mean survival rates of fish under T1, T2 and T3 were 76%, 74.8% and 68% respectively. The specific growth rates (SGR, % per day) of fish under T1, T2 and T3 were 2.21%, 2% and 1.80%. The calculated net fish production of the ponds under T1 was 27.29 kg/dec. and that of the ponds under T2 was 25.08 kg/dec. and 21.79 kg/dec. inT3. The BCR was calculated 1:1.38 for T1, 1:1.20 for T2 and 1:1.06 for T3. The findings of this experiments revealed that among three treatments, the stocking density 220 per decimal (T1) is the most suitable.
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How to cite this article:
MM Nabi. Study the optimization of stocking density of tilapia and carps in poly-culture system at earthen ponds of Bapard campus of Gopalganj district. International Journal of Fisheries and Aquatic Research, Volume 6, Issue 1, 2021, Pages 34-39
International Journal of Fisheries and Aquatic Research