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

Kronert, U.; Hörstgen‐Schwark, Gabriele; Langholz, H.-J.

doi:10.1016/0044-8486(89)90195-6

Cited by 34 publications

(11 citation statements)

References 7 publications

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“…Meanwhile, the CVs of gonad traits were much greater than that of body traits, and GSI had the greatest value of CV (222.562%) among all traits. Similar results were found in tilapia, Oreochromis niloticus (Kronert et al ). Considerable selection differential could be obtained by selecting individuals with lowest GSI and DW for breeding, which would be beneficial for obtaining late‐maturing strains.…”

Section: Discussionsupporting

confidence: 87%

“…On the contrary, all the gonad traits had low heritabilities in M. amblycephala. In the previous reports, GW showed a moderate heritability in tilapia (Kronert et al 1989), coho salmon, Oncorhynchus kisutch (Neira et al 2004), North American Arctic charr, Salvelinus alpinus (Wolters et al 2013), and Atlantic cod, Gadus morhua (Nguyen 2013). In body shape traits, the heritabilities of body shape traits were moderate and low, which was similar to rainbow trout, Oncorhynchus mykiss (Fishback et al 2002) and tilapia (Trong et al 2013).…”

Section: Discussionmentioning

confidence: 85%

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Estimates of Heritabilities and Genetic Correlations for Growth and Gonad Traits in Blunt Snout Bream, Megalobrama amblycephala

Zhao

Zeng

Wan

et al. 2016

J World Aquaculture Soc

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Blunt snout bream, Megalobrama amblycephala, is an herbivorous freshwater fish and has been recognized as a main aquaculture species in the Chinese freshwater polyculture system. The objective of the study is to estimate the genetic parameters for growth, body shape, and gonad traits for M. amblycephala at 1 yr of age. The phenotypic analysis showed that coefficients of variation for gonad traits had large variation relative to the other traits analyzed, and there was no sexual dimorphism by comparing growth and body shape in M. amblycephala. Based on restricted maximum likelihood and Markov chain Monte Carlo Bayesian methods using the animal model, the heritabilities of body weight (0.423–0.504), body length (0.309–0.678), body height (0.408–0.599), and dressed weight (0.359–0.643) were moderate and high, while the other traits, including conditional factor (0.029–0.199), body shape coefficient (0.095–0.405), edible ratio (0.073–0.207), gonad weight (0.018–0.170), and gonadosomatic index (0.050–0.222), had moderate or low heritabilities. High genetic and phenotypic correlations were found among growth traits, but not between growth traits and body shape or gonad traits except dressed weight. Based on our results, it could be efficient to combine the selection on body weight for fast growth and nonearly sexual maturity varieties of M. amblycephala breeding.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 85%

Estimates of Heritabilities and Genetic Correlations for Growth and Gonad Traits in Blunt Snout Bream, Megalobrama amblycephala

Zhao

Zeng

Wan

et al. 2016

J World Aquaculture Soc

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“…Those values were close to the heritability traits already used in the selection criteria, such as body weight and harvest weight (Santos et al 2011, Trọng et al 2013a, Yoshida et al 2013b). The heritability estimates of 0.18 and 0.57 were obtained for gonad weight (Charo-Karisa et al 2007) and sexual maturity stage (Kronert et al 1989, Oldorf et al 1989, respectively.…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters in female reproductive traits of Nile tilapia (Oreochromis niloticus)

Yoshida

Oliveira²,

Kunita³

et al. 2017

An. Acad. Bras. Ciênc.

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Genetic parameters for reproductive traits in female Nile tilapia were estimated in this study using Bayesian inference method. The data set presented information from 451 Nile tilapia females that were evaluated at two different places in Maringá -Paraná -Brazil (hapas of 1 and 10 m³) and at one location in Alfenas -Minas Gerais -Brazil. A spawning examination was conducted once a week from October 2012 to March 2013 for a total of 23 weeks of evaluation. Single-trait analyses for spawning success, multiple spawning, spawning frequency, and volume of eggs/female were performed by using the software MTGSAM Threshold. The heritability estimates were 0.14, 0.16, 0.53, and 0.08 for spawning success, multiple spawning, spawning frequency and volume of eggs/female, respectively, indicating it is possible to achieve a substantial genetic gain using these reproductive traits as selection criteria.

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“…Results from other studies (Kronert et al . ; Charo‐Karisa ) show zero correlations between harvest weight or growth rate and maturation. In this case, inclusion of late maturation in the breeding goal would only reduce the response to selection for growth traits.…”

Section: Discussionmentioning

confidence: 98%

“…Selection for improved growth may increase the frequency of early-maturing females, but not males (Longalong et al 1999). Results from other studies (Kronert et al 1989;Charo-Karisa 2006) show zero correlations between harvest weight or growth rate and maturation. In this case, inclusion of late maturation in the breeding goal would only reduce the response to selection for growth traits.…”

Section: Implications For a Breeding Programmementioning

confidence: 90%

Defining a breeding objective for Nile tilapia that takes into account the diversity of smallholder production systems

Omasaki

Arendonk

Kahi

et al. 2016

J Animal Breeding Genetics

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In general, livestock and fish farming systems in developing countries tend to be highly diverse in terms of agro-ecological conditions and market orientation. There are no studies that have investigated if and how this diversity translates to varying preferences for breeding objective traits. This is particularly important for breeding programmes that are organized on a national level (e.g. government-supported nucleus breeding programmes). The aim of this study was to investigate whether Nile tilapia farmers with diverse production systems and economic constraints have different preferences for breeding objective traits. The second objective was to derive a consensus breeding goal, using weighted goal programming that could be used for a national breeding programme for Nile tilapia. A survey was conducted among 100 smallholder Nile tilapia farmers in Kenya to obtain preference values for traits of economic importance, by using multiple pairwise comparisons. Individual and group preference values were estimated using analytical hierarchy process. Low-income farmers preferred harvest weight, while medium- and high-income farmers preferred growth rate and survival. Grouping farmers according to market objective (fingerling production or fattening) showed that fingerling producers preferred growth rate and survival, while fattening farmers preferred harvest weight, height and thickness. Weighted goal programming was used to obtain consensus preference values, and these were used to derive desired gains for a breeding goal of a national breeding programme that takes into account the diversity of smallholder production systems.

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

Cited by 34 publications

References 7 publications

Estimates of Heritabilities and Genetic Correlations for Growth and Gonad Traits in Blunt Snout Bream, Megalobrama amblycephala

Estimates of Heritabilities and Genetic Correlations for Growth and Gonad Traits in Blunt Snout Bream, Megalobrama amblycephala

Genetic parameters in female reproductive traits of Nile tilapia (Oreochromis niloticus)

Defining a breeding objective for Nile tilapia that takes into account the diversity of smallholder production systems

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