Journal of Environmental Biology

Patterns of colour inheritance from crossbreeding between Red hybrid tilapia (Oreochromis sp.) and GIFT tilapia (Oreochromis niloticus)

O.F. Nwachi^1,3, Y.B. Esa^1,2*, A. Christianus¹, A.A. Rahim¹ and M.S. Kamarudin¹ ? 

¹Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, 43400, Malaysia

²International Institute of Aquaculture and Aquatic Sciences (I-AQUAS), Universiti Putra Malaysia, Negeri Sembilan, 71050, Malaysia

³Department of Fisheries, Delta State University Abraka, Asaba Campus, P.M.B. 1, Nigeria

*Corresponding Author Email : yuzine@upm.edu.my

Paper received: 22.11.2020 ?????? ???????????????????????????????????????Revised received: 23.01.2020 ???????????? ???????????????????????????????????Accepted: 14.08.2020

Abstract

Aim: To examine the pattern of colour inheritances from crossbreeding between Red hybrid tilapia (Oreochromis sp.) and GIFT tilapia (Oreochromis niloticus).

Methodology : A total number of 60 broodstock of 30 each of GIFT and Red hybrid tilapia were selected to produce the first filial generation (F₁) and its reciprocal nF₁. Pairing of female to male were done in the ratio of 3:1. The same breeding scheme were used to produce the second filial generation (F₂) and its reciprocal nBcF₁.

Results : Crossbreeding between Red hybrid tilapia male and GIFT female (F₁) produced phenotypic colours ranging from red (64.61%), wild type (11.54%), red with blotches (4.96%) and mixed red-wild type (18.87%). The reciprocal cross between GIFT male and Red hybrid tilapia female (nF₁) produced phenotypic colours ranging from red (19.65%), wild type (64.62%), red with dark blotches (4.03%) and mixed red-wild type (11.46%). The second filial (F₂) generation produced phenotypes comprising of 61.17% wild type, 14.37% red with dark blotches, 20.04% mix red-wild type and 4.40% red type. The backcross (BcF₁) produced 10.57 %, faded wild type 22.76 %, red with dark blotches, 28.41 %, red with dark posterior and 60.46 % red phenotype while the reciprocal (nBcF₁) produced 52.89% faded wild type, 15.11% red with dark blotches, 6.83% mix red-wild type and 25.15% red phenotype.

Interpretation : Manifestation of intermediate and mixed colour phenotypes in F₂ hybrids and deviation from a simple dominant inheritance might indicate an incomplete dominant inheritance, colour determination in tilapia in this study might be located or linked with the male Y-chromosome due to the fact that more reddish coloured fish were produced when Red hybrid tilapia was selected as the parent.

Key words : Colour phenotype, Crossbreeding, Red hybrid tilapia, GIFT, Mendelian inheritance

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