Pink body colour in Tilapia shows single gene inheritance

Abstract

Segregation of a wide range of body colour in the progenies was observed in breeding experiments with the Taiwanese red tilapias. Homozygous stocks of pink, red and golden colour morph were selected from such a stock by brother‐sister crossing for six generations. DNA fingerprinting analysis using multilocus M13 and Bkm 2(8) probe and HinfIenzyme combinations of pink individuals, showed homozygosity in their genome. Pink individuals when crossed to black Oreochromis mossambicus (Peters) resulted in all pink F1 progenies. F1 X F1 crosses resulted in segregation of pink and black in the F2 progenies in a 3 : 1 ratio. F1 pink individuals when backcrossed to O. mossambicus gave progeny in the ratio of 1: 1 of pink and black. Black individuals from the F2 generation, when crossed to O. mossambicus and pink separately, resulted in all black and all pink progenies, respectively. These results show that the pink colour is dominant over the black phenotype and is inherited as an autosomal locus with complete penetrance.

Comparison of growth, fillet yield and proximate composition between Stirling Nile tilapia (wild type) (Oreochromis niloticus , Linnaeus) and red hybrid tilapia (Florida red tilapia×Stirling red O. niloticus ) males

“…Worldwide, tilapia production has tripled over the past decade (FAO 1999) because of its quality and wide acceptance for human consumption as whole fish or fillets (DeWandel 1995). The presence of red varieties of Oreochromis niloticus (Linnaeus), O. mossambicus and red hybrids, such as the Florida red tilapia (FRT), Taiwanese red tilapia and the Philippine red tilapia, has also been commercially important in the cultivation of these cichlids (Behrends, Nelson, Smitherman & Stone 1982; Wohlfarth, Rothbard, Hulata & Szweigman 1990; Koren, Pruginin & Hulata 1994; Hulata, Karplus & Harpaz 1995; Majumdar, Nasaruddin & Ravinder 1997). Even in Mexico, red tilapia is preferred over wild‐type tilapia, and the price for red ones is usually higher than that for wild types.…”

The previous concept of the cosmopolitan pest ant Tapinoma melanocephalum (Fabricius, 1793) includes two species (Hymenoptera: Formicidae: Tapinoma)

“…There are lots of textbook examples demonstrating a rather simple pigmentation genetics (e.g. LUS, 1932;BARRION & SAXENA, 1987;MAJERUS, 1998;ANDRÈS &CORDERO, 1999 andMAJUMDAR et al 2008). The occasional loss of the remarkable ghost ant pigmentation in Tapinoma melanocephalum observed in material of the presented study is supposed to represent a mutation.…”

A striking color variation is detected in Ponera testacea Emery, 1895 (Hymenoptera, Formicidae) across its Western Palaearctic geographic range

“…Many textbook examples demonstrate relatively simple pigmentation genetics (e.g. Lus 1932;Barrion and Saxena 1987;Majerus 1998;Andrés and Cordero 1999;Majumdar et al 2008). Taxonomic failures or pitfalls resulting from pigmentation in ants have been repeatedly reported.…”