Mass selection for red colour in Oreochromis niloticus (Linnaeus 1758)

Garduño‐Lugo, Mario; Muñoz‐Córdova, Germán; Olvera‐Novoa, Miguel A.

doi:10.1111/j.1365-2109.2004.01016.x

Cited by 16 publications

(13 citation statements)

References 3 publications

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“…However, this is not absolutely true since some Rr fish have been produced with no apparent melanophore blotching and some RR fish have higher degree of blotching compared to Rr individuals (McAndrew et al, 1988). Another possibility is that the blotched phenotype may be controlled at a secondary locus, where their presence maybe masked in the wild type due to the primary colour locus (McAndrew et al, 1988;Mather et al, 2001;Garduno Lugo et al, 2004).…”

Section: Genetics Of Colour Variants In Oreochromis Niloticusmentioning

confidence: 89%

“…Another study by Garduno Lugo et al (2004) also applied mass selection technique in red O. niloticus to obtain red fish with reduced blotching after five generations. Selections for red individuals were done at two different stages, when fry were only 3 g and also before reproduction stage.…”

Section: Genetics Of Colour Variants In Oreochromis Niloticusmentioning

confidence: 99%

“…Several studies on this subject include Behrends et al (1982);, McAndrew et al (1988), Avtalion and Reich (1989), Tave et al (1989), Hussain (1994), Majumdar et al (1997), Mather et al (2001), Hilsdorf et al (2002) and Garduno-Lugo et al (2004). One of the major issues with red tilapia culture is the black melanin blotching which negatively affect their marketability (Mather et al, 2001).…”

Section: Genetics Of Colour Variants In Oreochromis Niloticusmentioning

confidence: 99%

“…Production of red fish free from blotches through mass selection however needs particular paired mating and as mentioned in Garduno-Lugo et al, (2004), it primarily depends on two major factors which are the genetics control of the colour (Tave, 1986) and the selection pressure applied towards blotching (Mather et al, 2001). As in the case of Fijian hybrids in the study described above, significant results from mass selection will only be seen if all wild type individuals are removed from data sets, and if not, improved body colour (i.e.…”

Section: Genetics Of Colour Variants In Oreochromis Niloticusmentioning

confidence: 99%

“…For red tilapia, attempts to improve body colour have been carried out through mass selection (Mather et al, 2001;Garduno Lugo et al, 2004) but this does not explain the mode of inheritance for the blotched phenotype.…”

Section: Introductionmentioning

confidence: 99%

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The effect of male colouration on reproductive success in Nile tilapia (Oreochromis niloticus)

et al. 2010

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Body colouration in tilapia is an important trait affecting consumer preference. In the Nile tilapia (Oreochromis niloticus), there are three colour variants which are normal (wild type), red and blond. In some countries, the red variant is important and reaches higher prices in the market. However, one major problem regarding red tilapia culture is their body colouration which is often associated with blotching (mainly black but also red) which is undesirable for the consumer. The overall aim of this work was to expand knowledge on various aspects of body colouration in Nile tilapia using genetic approaches. The results of this research are presented as four different manuscripts.The manuscripts (here referred as Papers) have either been published (Paper IV) or are to be submitted (Paper I, II and III) in relevant peer reviewed journals.Paper I and II investigated the inheritance of black blotching and other body colour components of the red body colour. Specifically, Paper I consisted of two preliminary trials (Trial 1 and 2), to look at the ontogeny of black blotching and body colour components over a period of six months. Trial 1 investigated the effect of tank background colour (light vs dark) on black blotching and other body colour components and was carried out using a fully inbred (all female) clonal red line. Trial 2 was carried out using mixed sex fish and was aimed to investigate the association of black blotching with the sex of the fish. The results from this study were used to guide the experiment described in Paper II. Sixteen red sires with various levels of black and red blotching were crossed to clonal females and the inheritance of blotching and other body colour components were investigated using parent-offspring regressions. The results showed no significant heritability for black blotching and body redness, but a significant niloticus) were used as mapping families and the blond locus was located in LG5. Four out of eight markers were successfully used to assess the interaction of blond on red blotched fish. The blond gene did not significantly reduce the area of blotching but did reduce the saturation (paler blotching) and enhanced the redness of body colour in the Rrblbl fish compared to the RrBlbl group.Finally, Paper IV aimed to find out the effect of male colouration on reproductive success in Nile tilapia. A choice of one wild type male and one red male was presented to red or wild type females and these fish were allowed to spawn under semi-natural spawning conditions. Eggs were collected from the female"s mouth after spawning and paternity was assessed using microsatellite genotyping and phenotype scoring. No significant departures from equal mating success were observed between the red and wild type males, however there was a significant difference between the red and wild The results from this research help to broaden our knowledge and understanding on the aspects of body colouration in Nile tilapia and provide fundamental information for further research.

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