Growth performance of Jayanti rohu with three species combination viz., Catla catla, Labeo rohita and Cirrhinus mrigala at different stocking densities

Abstract

The present study was conducted to compare the growth performance of 9 th generation Jayanti rohu with non-Jayanti rohu cultured together with Catla catla and Cirrhinus mrigala at different stocking densities for 90 days The experiment was carried out in homogenous rectangular cement cisterns in the wet laboratory of College of Fisheries, Assam Agricultural University, Raha. Four treatments with three replicates viz. Treatment-I, Treatment-II, Treatment-III and Treatment Control (reference treatment) were taken. Ten numbers of fishes were stocked in each cistern. Jayanti rohu was stocked at the rate of 35%, 40%, 45% and 0% in the treatments respectively. Non-Jayanti rohu was stocked at the rate of 40% in Control treatment The study revealed the effect of different stocking densities with better growth of Jayanti rohu in Treatment-I (35% stocking density) where stocking density of catla and mrigal was 55% and 10% respectively. The percentage weight gain of 9 th generation Jayanti rohu over non-Jayanti rohu showed 31.60% in Treatment-I followed by 17.13% in Treatment-II and lowest was recorded at 6.65% in Treatment-III treatment. The result indicates better performance of Jayanti rohu in terms of net weight gain, average daily growth rate, Food Conversion Ratio (FCR), Specific Growth Rate (SGR), survivability and production compared to non-Jayanti rohu.

Biocontrol of Oreochromis mossambicus Population by Chitala chitala (Hamilton, 1822) in a Composite Carp Culture System of Purulia District in West Bengal, India

“…C. catla known for its fast growing nature in an IMC based composite system [44], and in the present study similar phenomenon also been observed where average WG% and SGR values of C. catla remained significantly high among all treatments. Present study also represented poor growth performance of C. mrigala in comparison with other IMC, such situation coincides with some other works where similar types of variation among weight gain and SGR values of IMC varieties were reported [47]. Fruitful adoption of Chitala fish in composite carp culture system has been developed at farmers level in India for their piscivorous characteristics, but scientifically published data regarding the same not available yet [22].…”

“…As compared to C significantly lower growth rate of different carp species in T1 and T2 correlated with the survival rate. However, despite of ideal stocking density and ratio maintenance, WG% and SGR values remained low even in C if we compare this results with some other related works [33,47]. Based on such observations, it has been predicted that shortage of required supplementary feed is a potential reason for such unsatisfactory outcomes, as similar kinds of feed ingredients combinations showed ideal fish growth by utilizing them at the rate of 2-5% of total biomass on daily basis [32].…”