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Volume: 1; Issue: 4, Nov-Dec, 2013
Impact of different feeds on cannibalism in early larval stages of Koi carp (Cyprinus carpio)
K. Altaff and A. Janakiraman
Koi carp (Cyprinus carpio) is one of the commercially important ornamental fishes and reared in cottage industry for domestic and export market in many countries. In hatchery larval rearing, provision of suitable feed and control of cannibalism are the prime factors which govern the growth and survival of this species. In the present study, growth and survival of early larval stages of Koi carp were evaluated by feeding them with different zooplankton like rotifer (Brachionus plicatilis), cladoceran (Ceriodaphnia reticulata), copepod (Apocyclops dengizicus), mixture of these three zooplankton and the pelletized feed. Feeding trials were conducted in triplicate for three weeks. Results indicated higher survival and growth performance of larvae fed with rotifer, copepod and mixed zooplankton than those fed with cladoceran and pellet feed. Cannibalism is predominantly observed in the larvae ranging in length from 9.00 to 16.00 mm. Higher percentage of cannibalism was recorded in pellet- and cladoceran-fed larvae than in other feeds experimented. To improve the economics of Koi carp culture in hatcheries, use of rotifer (B. plicatilis) and copepod (A. dengizicus) feed is recommended that provides better growth and survival performance as well as less cannibalism.
Keywords: Koi carp, larval rearing, live feed, cannibalism, survival.