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Turkish Journal of Fisheries and Aquatic Sciences 2016, Vol 16, Num, 2     (Pages: 453-460)

Effect of Stocking Density on Growth, Size Variation, Condition Index and Survival of Discus, Symphysodon aequifasciatus Pellegrin, 1904

Raju Mahadev Tibile 1 ,Paramita Banerjee Sawant 1 ,Narinder Kumar Chadha 1 ,Wazir Singh Lakra 1 ,Chandra Prakash 1 ,Sambid Swain 1 ,Kaustubh Bhagawati 1

1 ICAR-Central Institute of Fisheries Education, Versova, Andheri (W), Mumbai-400061, India DOI : 10.4194/1303-2712-v16_2_25 Viewed : 2108 - Downloaded : 1939 Juveniles of the tropical ornamental fish, Discus (Symphysodon aequifasciatus) of mean standard length, 3.58 ± 0.03 cm and mean weight, 3.36 ± 0.03 g, were reared at four stocking densities (1 juvenile/10 L, 1 juvenile/7.5 L, 1 juvenile/5.0 L and 1 juvenile/2.5 L) with three replicates each, for a period of 12 weeks, to evaluate effect of stocking density on growth, condition index, size variation and survival. Growth and survival were recorded after every two weeks. At the end of the culture period, lower densities of 1 juvenile/10 L and 1 juvenile/7.5 L showed significantly higher growth and survival (p<0.05). The condition index and coefficient of variation did not vary significantly (p>0.05) among the stocking densities but coefficient of variation (CV) increased towards the end of the culture period. Results indicated that discus juveniles may be reared at the highest density of 1 juvenile per 2.5 l up to a period of two weeks without affecting growth parameters significantly, at a density of 1 juvenile per 5.0 l up to a period of six weeks and at a density of 1 juvenile per 7.5 l for a period of twelve weeks. It can, therefore, be concluded that a stocking density of 1 juvenile per 7.5 l is optimal for rearing juveniles of this fish without compromising on specific growth, survival and well-being. Keywords : Discus, stocking density, growth, survival, condition index