Premium
The dietary protein requirements of Cichlasoma synspilum Hubbs, 1935 (Pisces: Cichlidae) fry
Author(s) -
OlveraNovoa M A,
GascaLeyva E,
MartinezPalacios C A
Publication year - 1996
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 - 10.1111/j.1365-2109.1996.tb00981.x
Subject(s) - biology , zoology , fish meal , dietary protein , fish <actinopterygii> , weight gain , body weight , protein efficiency ratio , meal , feed conversion ratio , net protein utilization , fishery , food science , endocrinology
A 12 week feeding trial was conducted in a closed recirculating system with Cichlasoma synspilum (Hubbs) fry (280 mg) in order to determine their protein requirements. Six diets containing increasing protein levels (30, 35, 40, 45, 50 and 55%) were formulated using brown fish meal as the protein source. The fish were fed by hand daily at a rate of 6% body weight: at 2‐week intervals, the fish were bulkweighed and the feeding rate was adjusted accordingly After 90 days, a direct relationship was observed between dietary protein content and fmal body weight, weight gain, and specific growth rate (P < 0,05), with the best results for diets containing 50,45,40 and 55% of protein: feed intake, food conversion ratio, protein efficiency ratio, carcass nitrogen deposition and apparent N utilization were also statistically higher (P < 0,05) for fish fed diets with 50, 45, 40 and 55% of protein content. The lower performance was obtained in those fish fed diets with 30 and 35% protein content. Applying the broken‐line response method with SGR data, the protein requirement of C. sytispilum fry was established as 40.81%.