Premium
Effects of Chlorella powder as a feed additive on growth performance in juvenile Korean rockfish, Sebastes schlegeli (Hilgendorf)
Author(s) -
Bai S C,
Koo JW,
Kim KW,
Kim SK
Publication year - 2001
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1046/j.1355-557x.2001.00008.x
Subject(s) - biology , rockfish , sebastes , zoology , juvenile , feed conversion ratio , protein efficiency ratio , food science , fishery , fish <actinopterygii> , body weight , ecology , endocrinology
The present study was conducted to investigate the effects of Chlorella powder (CHP) as a feed additive on growth performance in juvenile Korean rockfish, Sebastes schlegeli (Hilgendorf). Six experimental diets were supplemented with Chlorella powder (CHP) at 0, 0.5, 1.0, 1.5, 2.0 and 4.0% (CHP 0 , CHP 0.5 , CHP 1.0 , CHP 1.5 , CHP 2.0 and CHP 4.0 , respectively) of diet as a dry matter basis. Three replicate groups of fish averaging 2.1 ± 0.02 g (mean ± SD) were fed one of six experimental diets for 12 weeks. After the feeding trial, fish fed CHP 0.5 had a higher weight gain and specific growth rate than did fish fed CHP 0 , CHP 1.5 , CHP 2.0 and CHP 4.0 . However, there was no significant difference among fish fed CHP 0.5 and CHP 1.0 . Fish fed CHP 0.5 had a significantly higher feed efficiency ratio and a protein efficiency ratio than did fish fed the other diets. Fish fed CHP 4.0 had a lower significantly serum total lipid than did fish fed CHP 0 , CHP 0.5 and CHP 1.0 , however, there was no significant difference among fish fed CHP 1.5 , CHP 2.0 and CHP 4.0 . Fish fed CHP 2.0 had significantly higher serum albumin and lower serum glucose than did fish fed CHP 0 . Fish fed CHP 4.0 had significantly higher liver protein and lower liver fat than did fish fed the other diets. These results suggest that the optimum dietary CHP supplementation level could be approximately 0.5% of diet for positive effects on growth and feed utilization without any negative effects on blood parameters and body composition in juvenile Korean rockfish.