Open AccessEFFECTS OF SIZE AT STOCKING ON COMPETITION AND GROWTH OF ALL‐MALE TILAPIA HYBRIDS
Author(s) -
McGinty Andrew S.
Publication year - 1985
Publication title -
journal of the world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0735-0147
DOI - 10.1111/j.1749-7345.1985.tb00186.x
Subject(s) - stocking , tilapia , biology , competition (biology) , hybrid , zoology , fishery , fish <actinopterygii> , ecology , botany
Triplicate ponds (0.07‐ha) were stocked with either a single size group (11–12 cm) or mixed size groups (either smalls 7–8 cm, mediums 11–12 cm or larges 15–16 cm) of all‐male tilapia hybrids of female Tilapia nilotica x male T. hornorum . After 140 days, smalls, mediums and larges gained 1.89, 3.10 and 2.59 g/day in mixed stocking, respectively, while mediums in single stocking gained 2.59 g/day. In mixed stocking, growth of smalls was depressed due to competition with mediums, larges, or both. Larges apparently expended mre energy on nest building and guarding, thus allowing mediums to maximize their food intake and growth. Lack of a predetermined hierarchy under single stocking resulted in depressed growth.