Open AccessOffspring Growth in a Diallel Crossbreeding with Three Strains of Nile Tilapia Oreochromis niloticus
Author(s) -
Marengoni Nilton G.,
Onoue Yoshio,
Oyama Tetsuo
Publication year - 1998
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1998.tb00308.x
Subject(s) - purebred , nile tilapia , biology , oreochromis , crossbreed , heterosis , hybrid , diallel cross , zoology , veterinary medicine , fishery , botany , fish <actinopterygii> , medicine
— A complete diallel crossing of three strains, Stirling, Korean and Local, was used to evaluate heterosis of intraspecific crossbreeding on early growth of Nile tilapia Oreochromis niloticus . All possible F‐1 hybrid offspring were obtained and their growth rates to 90 d were compared. The specific heterosis for F‐1 hybrids in Stirling × Korean, Stirling × Local and Korean × Local crosses were 7.61, 5.63 and 7.70 for weight, and 0.47, 0.26 and 0.55 for length, respectively. The purebred Stirling strain showed better growth than the other two strains (P < 0.05). When growth of F‐1 hybrids was compared between sexes, males grew more rapidly than females (P < 0.05). However, no differences were observed in growth of male or female between hybrid groups. Purebred males in the Stirling strain were slightly heavier than those in the Korean and Local strains, and Local × Stirling, Korean × Local and Local × Korean crosses. However, in purebred females Stirling was superior to Korean, but not the Local strain and all F‐1 hybrid crosses. Implications to choose the appropriate strains for developing a breeding program of tilapia are also discussed.