Phenotypic variation in meiotic and mitotic gynogenetic diploids of the Nile tilapia, Oreochromis niloticus (L.)

Citation

Hussain MG, McAndrew B & Penman D (1995) Phenotypic variation in meiotic and mitotic gynogenetic diploids of the Nile tilapia, Oreochromis niloticus (L.). Aquaculture Research, 26 (3), pp. 205-212. https://doi.org/10.1111/j.1365-2109.1995.tb00903.x

Abstract
A range of phenotypic characters were measured and their mean and coefficient of variation (CV) calculated in meiotic and mitotic gynogenetic individuals and normal diploids produced from the same full-sib family of Oreochromis niloticus (L.). The traits studied in all three groups were weight, length, various fin ray and scale counts, gonadosomatic index (GSI) and reproductive response. The study revealed two main trends in the majority of the traits studied in the gynogenetic fish: a decrease in the mean of each trait in the ranked order normal diploid > meiotic gynogenetic > mitotic gynogenetic, and an expansion of its phenotypic variation (CV) in the order normal diploid < meiotic gynogenetic < mitotic gynogenetic. This could be related to the levels of genetic homozygosity and a possible reduction in developmental homeostasis in the gynogenetics. The utility and potential of gynogenetic individuals in research and the use of the technique in the improvement of fish strains for aquaculture are discussed.

Journal
Aquaculture Research: Volume 26, Issue 3