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Hatchery production of Florida red tilapia seed in brackishwater tanks: the influence of broodstock age
Author(s) -
SMITH S. J.,
WATANABE W. O.,
CHAN J. R.,
ERNST D. H.,
WICKLUND R. I.,
OLLA B. L.
Publication year - 1991
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.1365-2109.1991.tb00504.x
Subject(s) - broodstock , biology , stocking , hatchery , fishery , tilapia , zoology , fish <actinopterygii> , aquaculture
. Production of Florida red tilapia seed (eggs, sacfry and fry) in 34‐m 2 above‐ground tanks using recirculated brackishwater (12 ppt) was studied over a 5‐month period on Lee Stocking Island (Exuma Cays, Bahamas). Four tanks were stocked with year class 1 (YCI) breeders, while 2 tanks were stocked with year class 2 (YCII) breeders at densities of 200 and 240/tank (5·9 and 7·1/m 2 ), respectively, and at a sex ratio of 3 females to 1 male, beginning in November 1988. Seed production was measured by removing free‐swimming fry from tanks and eggs and sacfry from the mouths of brooding females, and assessing the number of each at 15 to 16‐day intervals from February to June 1989. Average seed production (seed/m 2 /day) was significantly higher in YCI (52·3) than in YCII (36·0) broodstock, indicating the advantages of replacing broodstock with yearling breeders each year.