Effects of different initial food on growth performance,nutrients,and activity of digestive enzymes of juvenile channel catfish
The experiment aimed to investigate the effects of different initial food on the growth performance,nutrients,and activity of digestive enzymes of juvenile channel catfish.A total of 6 000 healthy juvenile channel catfish with body mass(0.03±0.01)g and body length(1.47±0.09)cm were randomly divided into four groups,each fed with compound feed,rotifer,Limnodrilus hoffmeisteri,and artemia,respectively,with three replicates per group and 500 fish per replicate.The experimental period lasted for 31 days,including a ten-day initial feeding phase and a 21-day transition phase.The results showed that in the initial feeding phase,juvenile channel catfish in the compound feed group had the longest body length and much greater body weight than those in the Limnodrilus hoffmeisteri and artemia groups(P<0.05),with a specific growth rate of 15.40%/d and weight gain rate of 366.78%,and had the highest levels of crude protein,crude fat,and crude ash(P<0.05).During the transition to compound feed phase,juvenile channel catfish in the compound feed group maintained their growth advantage in terms of body length and weight.In contrast,juvenile channel catfish in the Limnodrilus hoffmeisteri and artemia groups grew faster than those in the compound feed and rotifer group(P<0.05)in terms of specific growth rate and weight gain rate.Throughout the two periods,the pepsin activity of juvenile channel catfish in each experimental group increased first and then decreased,while the activities of lipase and amylase declined gradually.The study indicates that among the four types of initial feeds,compound feed is the most suitable initial food for juvenile channel catfish.
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