Evaluation of different types of feed in carp polyculture

Abstract

An experiment was conducted to assess the effects of different types of feed on the growth and production of common carp (Cyprinus carpio), grass carp (Ctenopharyngodon idella), and rohu (Labeo rohita) for 6 months in 9 ponds of 150 m2 each. They were fed on mash feed (T1), sinking pellet (T2), and floating pellet (T3) @ 5% of total body weight daily along with finely chopped Dubo grass (Cynodon dactylon) for grass carp. Combined extrapolated gross and net fish yield was found the highest in T3, intermediate in T2, and lowest in T1. The feed conversion ratio was found the least in T3 followed by T2 and T1. Total production costs involved in fish production were found the highest in T3 followed by T2 and T1. The gross margin was significantly higher in T2 and T3 than in T1 (p