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Survival rates of tilapia, Oreochromis spilurus (Günther), fingerlings reared at high densities during winter using warm underground sea water
Author(s) -
Cruz E M,
Ridha M T
Publication year - 1995
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.1365-2109.1995.tb00918.x
Subject(s) - stocking , biology , tilapia , zoology , fishery , oreochromis , fish <actinopterygii> , seawater , aquaculture of tilapia , ecology
The study was conducted to determine the optimum stocking density for rearing tilapia. Oreochromis spilurus (Günther), fingerlings in tanks during winter using warm (21‐26°C) underground sea water (37%o). Seawater‐acclimated fingerlings with mean weight of 2 g were stocked in eighteen 400‐1 fibreglass tanks at 750 and 1000 fish m −3 . Fish were fed at the rates of 2.5, 3.0 and 3.5% day −1 of the fish biomass. After 83 days, the mean individual daily weight gain was significantly higher (P < 0.028) at stocking of 750 fish m −3 than at 1000 fish m −3 . Feed conversion ratio was significantly higher at stocking of 1000 fish m −3 than at 750 fish m −3 and at feeding rate of 3.5% day 1 than at 2.5% day −1 . However, because no significant differences were observed on survival rates between the two stocking densities and among feeding rates, it is recommended that the stocking density of 1000 fish m −3 and a feeding rate of 2.5% day −1 be used for optimum production of tilapia fingerlings in tanks during winter using warm underground sea water.