The Israeli Journal of Aquaculture – Bamidgeh 57(2), 2005, 115-124       
 
MANAGEMENT INDUCED CHANGES IN FOOD SELECTION, GROWTH AND SURVIVAL OF KOI CARP, CYPRINUS CARPIO VAR. KOI L., IN TROPICAL PONDS

Prithwiraj Jha and Sudip Barat* 

Aquaculture and Limnology Laboratory, Department of  Zoology, University of North Bengal, District Darjeeling, West Bengal 734 430, India
(Received 26.12.04, Accepted 12.3.05)

Key words: Cyprinus carpio, enriched ponds, food selection, larvae, plankton
 
Abstract


The effects of different management regimes on the feeding habits and food selection of koi carp (Cyprinus carpio var. koi L.) larvae were examined. Weight gain, fish deformities, and survival were compared in an 11-week growth trial conducted in tropical ponds maintained according to four culture regimes: (1) live food system; (2) poultry manure treated system; (3) cow dung treated system; and (4) a control. The Ivlev’s Electivity Index showed that koi larvae avoided phytoplankton and preferred cladocerans, an important source of natural food in all the regimes. In the poultry and cow manured ponds, the larvae were negatively elective towards copepods although they were more abundant than cladocerans. Weight gain and survival was significantly higher in the live-feed system (p<0.05) than in the other systems. Fish deformities were significantly higher (p<0.05) in the control.


* Corresponding author. E-mail: sudipbarat@rediffmail.com

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