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Economics behind alterations in the management practices of composite farming of Indian major carps in 24 Parganas (N) district, West Bengal

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  • The present status and deviations from the classical management practices of composite farming of Indian major carps (IMC) have been investigated in North 24 Parganas district of West Bengal, India. Classical six species combination, ratio of IMC and exotic carps were not being followed by any of the farmers as 75% fish farmerspolyculture 7-10 species with stoking density of 15000 nos. fingerling ha-1though six species combination has been proved to be optimalfor fish yield. 71.68% farmers who produced more than 5 tonnes ha-1yr-1stocked their pond twice in a year instead of once.With regards to annual yield, application of 350-400 and 200-250 kg ha-1agricultural lime and fertilizer (urea + single super phosphate = 1:1) respectively, was found to be optimal towards fish production. Production level declined as the depth of the pond increased from 5 to 9 feet. Inclusion of readily available carbohydrate source like molasses and boiled starch in supplementary feed preparation was conspicuous. Because of better economical returns from minor fishes, remarkable introductions in the original six species combination were minor carps like bata, Japani punti, tilapia; minor fish like mola (Amblypharyngodon mola) carplet and scampi (Macrobrachiumrosenbergii). Majority of the farmers used to stock more silver carp because of faster economic returns though it had a direct bearing upon the major carps.
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  • Seattle, Washington, USA
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