Prospects of selecting for late maturity in tilapia (Oreochromis niloticus)

Oldorf, W.; Kronert, U.; Balarin, J.D.; Haller, R. W.; Hörstgen‐Schwark, Gabriele; Langholz, H.-J.

doi:10.1016/0044-8486(89)90196-8

Cited by 26 publications

(4 citation statements)

References 2 publications

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“…Tilapia need about 6 months to reach the commercial weight of 250 g (Tave 1993) and show a coefficient of variation and heritability (h 2 ) for growth that predicts an effective selection program (Oldorf et al 1989;Sánchez et al 1994;Martínez et al 1996). Therefore, the genetic manipulation of these fish species toward growth acceleration is important.…”

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confidence: 99%

Safety Evaluation of Transgenic Tilapia with Accelerated Growth

et al. 1999

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Recent advances in modern marine biotechnology have permitted the generation of new strains of economically important fish species through the transfer of growth hormone genes. These transgenic fish strains show improved growth performance and therefore constitute a better alternative for aquaculture programs. Recently, we have obtained a transgenic tilapia line with accelerated growth. However, before introducing this line into Cuban aquaculture, environmental and food safety assessment was required by national authorities. Experiments were performed to evaluate the behavior of transgenic tilapia in comparison to wild tilapia as a way to assess the environmental impact of introducing transgenic tilapia into Cuban aquaculture. Studies were also conducted to evaluate, according to the principle of substantial equivalence, the safety of consuming transgenic tilapia as food. Behavior studies showed that transgenic tilapia had a lower feeding motivation and dominance status than controls. Food safety assessment indicated that tilapia growth hormone has no biological activity when administered to nonhuman primates. Furthermore, no effects were detected in human healthy volunteers after the consumption of transgenic tilapia. These results showed, at least under the conditions found in Cuba, no environmental implications for the introduction of this transgenic tilapia line and the safety in the consumption of tiGH-transgenic tilapia as an alternative feeding source for humans. These results support the culture and consumption of these transgenic tilapia.

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confidence: 99%

Safety Evaluation of Transgenic Tilapia with Accelerated Growth

et al. 1999

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“…Many selection projects on tilapias have been carried out in the world, mostly targeting growth rate (Jarimopas 1986, 1989; Teichert‐Coddington & Smitherman 1988; Hulata, Wohlfarth & Halevy 1989; Huang & Liao 1990; Brzeski & Doyle 1995; Longalong, Eknath & Bentsen 1999; Li, Li & Li 2001; Bolivar & Newkirk 2002), a few on late maturation (Kronert, Hoerstgen, & Langholz 1989; Oldorf, Kronert, Balarin, Haller, Hoerstgen & Langholz 1989; Horstgen‐Schwark & Langholz 1998; Dan & Little 2000) and one on pigmentation (Ma, Bai & Chen 1993). In the growth rate aspect, some researchers reported that growth was improved significantly (Jarimopas 1986; Brzeski & Doyle 1995; Li et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Improving growth performance and caudal fin stripe pattern in selected F6–F8 generations of GIFT Nile tilapia (Oreochromis niloticus L.) using mass selection

et al. 2006

Aquaculture Res

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Genetic improvement using the mass selection method of growth performance and stripe pattern on caudal ¢n in selected F 6 , F 7 and F 8 generations from genetically improved farmed tilapia strain Nile tilapia was evaluated at the National Tilapia Seed Farm of Qingdao, north China. In experiment I (2003), the average of daily body-weight gain of F 7 was 12.5% higher than F 6 , and 28.6% higher than F 5 (Po0.05). In experiment II (2004), the average daily bodyweight gain of F 8 was 12.9% larger than F 7 , and 56.9% larger than F 6 (Po0.05). Coe⁄cient of variation [(SD/mean)100] of body weight of F 8 decreased signi¢cantly (Po0.05) to 79.7% of F 6 and 72.9% of F 7 , respectively, indicating that the growth became more synchronous after continuous selection. The percentage of ¢sh with ideal vertical and parallel stripes on caudal ¢ns in F 5 , F 6 , F 7 and F 8 reached 24.8%, 28.8%, 32.2% and 37.6%, respectively, signi¢cantly higher than that of the base population (17.6%) (Po0.05). Ã Testing facility is 60 m 3 circulated concrete tanks. Conducted by a 3 (tank) Â 3 (group) randomized block design. Communally stocked after ¢n clipping. The density was 20^30 ¢sh m À 3 for each group. The statistics of ¢nal weight were from random sample, including 50 males and 50 females from each group each tank ¢rst, and then pooled. wSex-combined value, for example, AGR of F 8 /F 6 is (1.64 AE 2.19)/(1.08 AE 1.36) Â 100 5156.9. BW, body weight; AGR, absolute growth rate; GIFT, genetically improved farmed tilapia; CV, coe⁄cient of variance.

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“…Tilapia (family Cichlidae) are among the most important food fishes in global aquaculture (Pullin,The most commonly reared species of tilapia are Oreochromis niloticus, 0. aureus, and 0. mossambicus. The productivity of these species has been improved through selective breeding (Uraiwan and Doyle, 1986;Kronen et al, 1989;Oldorf et al, 1989;Brzeski and Doyle, 1995;Velasco et al, 1995). Traits of breeding interest include growth rate, disease resistance, and male-skewed sex ratio.…”

Section: /// Example Of Practical Application: Qtl Detection and Masmentioning

confidence: 96%

Toward detection of quantitative trait loci and marker‐assisted selection in fish

Poompuang

Hallerman

1997

Reviews in Fisheries Science

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Genes affecting aquaculture performance, or quantitative trait loci (QTLs), can be mapped in relation to naturally occurring genetic markers. Knowledge of linkages between marker and QTL alleles can be used for marker-assisted selection (MAS), increasing the rate of genetic progress above that for selective breeding alone. Although fish may provide an attractive system for detecting QTLs and executing MAS, QTL detection and MAS have not yet been practiced on an aquaculture species. We review the technical literature on QTL detection and MAS in other species in order to advance critical discussion of how best to pursue QTL detection and MAS in fish. Over 100 highly polymorphic markers would be needed for complete genome coverage, although a subset of QTLs might be detected with fewer markers. The need for cost-effectively screening markers suggests polymerase chain reaction-based screening of a collection of microsatellite loci or RAPDs (random amplified polymorphic DNAs). Experimental power calculations suggest that because markers will have to be screened within large progeny groups, selective or sequential genotyping or screening of bulked DNA samples are needed for cost-effective detection of QTLs. With well-designed experiments, QTL detection and MAS might prove an effective adjunct to conventional selective breeding in fishes.

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Prospects of selecting for late maturity in tilapia (Oreochromis niloticus)

Cited by 26 publications

References 2 publications

Safety Evaluation of Transgenic Tilapia with Accelerated Growth

Safety Evaluation of Transgenic Tilapia with Accelerated Growth

Improving growth performance and caudal fin stripe pattern in selected F6–F8 generations of GIFT Nile tilapia (Oreochromis niloticus L.) using mass selection

Toward detection of quantitative trait loci and marker‐assisted selection in fish

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