Growth performance and implication of a thermal-unit growth coefficient of grass carp ctenopharyngodon idella and silver carp hypophthalmichthys molitrix larvae reared in recirculation system

الملخص EN

The present study evaluated the growth performance of two carp species i.e.

grass carp Ctenopharyngodon idella and silver carp Hypophthalmichthys molitrix larvae reared in recirculation system and implication of a thermal unit growth coefficient (TGC) to quantify and predict its growth potential .The environmental factors of the water in the recirculation system was in the range of tolerance of both species where no mortality occurred.

The result revealed that silver carp larvae growth performance was superior to grass carp larvae for all biotic indices as it reaches 0.802 g after 43days while its growth rate were 0.0301 g / day after 19 and 26 days from the start of experiment.

TGC was 0.0578 for grass carp larvae and 0.0865 for silver carp larvae, also the relation between observed and predicted growth of grass carp larvae was more matching than for silver carp larvae .It can be concluded that growth of grass and silver carp larvae in recirculation system were acceptable and the TGC values were fairly stable.