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Overwintering tilapia, Oreochromis spilurus (Günther), fingerlings using warm underground sea water
Author(s) -
Cruz E.M.,
Ridha M.
Publication year - 1994
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.1365-2109.1994.tb01348.x
Subject(s) - overwintering , stocking , biology , tilapia , zoology , fishery , oreochromis , growth rate , seawater , weight gain , aquaculture of tilapia , fish <actinopterygii> , water flow , feed conversion ratio , body weight , ecology , mathematics , environmental engineering , environmental science , geometry , endocrinology
. The study was conducted to develop guidelines for high‐density overwintering of tilapia in tanks using warm underground sea water. Seawater‐acclimated fish of 20 g were stocked in 36 tanks at 250, 500 and 750/m 3 . Water flow was regulated at 0.1 and 0.2 l/kg fish/min. Fish were fed at the rates of 0.75% and 1.0% of biomass per day. After 135 culture days, the mean individual weight gain and specific growth rate decreased, whereas feed conversion increased significantly ( P <0.0001) with the increase in stocking density. The condition factor at 500 and 750 fish/m 3 was significantly lower ( P <0.0005) than at 250 fish/m 3 . However, stocking density had no significant effect on the survival rate. Significantly better specific growth rate, condition factor and feed conversion were observed at a water flow rate of 0.2 l/kg fish/min than at 01 l/kg fish/min. Significantly higher mean individual weight gain, specific growth rate, and survival rate were observed at 1.0%/day than at the 0.75%/day feeding rate. The findings indicate that the optimum stocking density for overwintering tilapia in tanks using warm underground sea water is 750 fish/m 3 with a water flow rate of 0.1 l/kg fish/min and a feeding rate of 0.75%/day.