GROWTH AND SURVIVAL OF CARPS IN SALT-AFFECTED PONDS UNDER DIFFERENT TREATMENTS
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Authors
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SURESH CHANDRA
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KRIPAL DATT JOSHI
Abstract
Field experiments were conducted on salt-affected fish ponds having water conductivity between 1191 and 1386μmhos/ cm showed the effect of cow dung application @ 5 ton /ha/yr (T1), 15 ton/ha/ yr (T2) and 10 ton/ ha/yr with 5 ton ensiled paddy straw (T3) in replicates. Ponds were stocked with advance fry of rohu (Labeo rohita), catla (Catla catla), mrigal (Cirrhinus mrigala) and common carp (Cyprinus carpio) @ 8,000nos. /ha. Besides three applications, gypsum @ 1.5 ton/ha and standard practices of fish pond management were uniformly followed in all the six ponds
during the culture period of 12 months. Pooled data showed significant decline in Conductivity and Total Dissolved Solids (TDS). Percent reduction of Conductivity and Total Dissolved Solids was 41.78 and 41.64 in T1; 42.69 and 42.57 inT2 and 47.09 and 46.72 in T3 , with survival of 55.46%, 57.85% and 62.69% respectively. Fish yield of 4239.75tonns /ha/ yr obtained in T3, which was 26.27%, higher than T2, and 32.41% higher than T1. Common carp species performed better in all treatments with 25% higher growth in T3. Improvement of pond environment in T3 resulted to faster amelioration of water parameters establishing its superiority over other applications in salt-affected fish ponds.
Key words : Salinity, gypsum, cow dung, ensiled paddy straw, major carp production.
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