Derivation of economic values for production traits in aquaculture species

Janssen, Kasper; Berentsen, P.B.M.; Besson, Mathieu; Komen, Hans

doi:10.1186/s12711-016-0278-x

Cited by 22 publications

(33 citation statements)

References 54 publications

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“…Por lo que el segundo objetivo de esta investigación se enfocó en realizar un análisis de rentabilidad del cultivo de tilapia nilótica utilizando diferentes estrategias de alimentación y diferentes escenarios de evaluación de la relación beneficio/ costo y el NPV. Integrando al modelo los criterios analíticos propuestos por Janssen et al (2017) en las variables biológicas y los criterios desarrollados por Perea-Román et al (2018), así como también los de Phiri & Yuan (2018) en los índices de rentabilidad económica y en los coeficientes de sensibilidad determinados en este modelado con tilapia.…”

Section: P a L A B R A S C L A V Eunclassified

“…Tilapia is a popular fish in the world freshwater aquaculture with 126 reported countries or regions, in which a production of 5.7 MT was recorded in 2015, according to data from FAO (2016). A relevant goal to keep this sector constantly growing involves developing new researches aiming to determine the benefits of using different feeding strategies, and how these strategies influence economic and productive parameters (Gutiérrez et al, 2015;Janssen et al, 2017). mismas dietas con un modelo de alimentación con restricción del 30 % (alimentación diaria al 70 %).…”

Section: Introductionmentioning

confidence: 99%

“…La tilapia es un pez popular en la acuacultura mundial de agua dulce con 126 países o regiones reportadas, de las cuales en 2015 se registró una producción de 5.7 MT según datos de la FAO (2016). Una meta relevante para mantener este sector en constante crecimiento implica el desarrollo de nuevas investigaciones centradas en determinar el beneficio de utilizar diferentes estrategias de alimentación, y como estas influyen en los parámetros económicos y productivos (Gutiérrez et al, 2015;Janssen et al, 2017).…”

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Ramírez-Ramírez

et al. 2019

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The growth trial lasted 45 days with Nile tilapia (9.6 g) in which 4 diets were evaluated with P/E levels of 18, 19, 20 and 21 kg/MJ with an apparent satiety feeding model (100 % daily feed intake) and the same diets with a 30 % restriction feeding model (70 % daily feed intake). The results of the experiment indicate that the diet with a P/E ratio of 18 kg/MJ supplied with a 30 % restriction improved feed consumption and the use of protein for growth (p<0.05). The profitability analysis determined that the feeding strategy (3H:2L) obtained the best benefit/cost ratio (1.11) and that this condition, once evaluated for 5 years under scenarios of increases in the cost of feed and in the sale price of the product, allowed obtaining increases in the benefit/cost ratio comparable to the performance of the baseline (initial production condition) in values of 1.2-1.4, however, the net present value under these conditions presents a downward trend. In conclusion, the profitability analysis was positive for the evaluation of the project after five-year period of production in terms of the benefit/cost ratio, besides obtained results varied depending on the quality of the diet and on the conditions of the analyzed productive system. Therefore, the usefulness of this modeling could be feasible to produce juveniles of commercial tilapia lines with an average weight of 150 g.

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Section: P a L A B R A S C L A V Eunclassified

Section: Introductionmentioning

confidence: 99%

Section: Introductionunclassified

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Gutiérrez‐Leyva

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Ramírez-Ramírez

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“…One of the main obstacles in incorporating uniformity in aquaculture breeding programs is often high and positive genetic correlation between level and variance of harvest weight, meaning that selection for uniformity will cause decrease in selection response in body weight, which is highly undesirable, especially giving the 161 low economic value of uniformity (Janssen et al, 2017). It would be interesting to see how indirect genetic effects for b correlate with genetic effects for body weight, and whether selection on IGEs only, could be used to improve uniformity, without consequences for growth.…”

Section: Future Perspectivesmentioning

confidence: 99%

“…In aquaculture, uniformity of body weight has recently been identified as one of the most important traits to be improved by selective breeding (Sae-Lim et al, 2012;Janssen et al, 2017;Omasaki et al, 2017). Studies in Atlantic salmon, rainbow trout, and Nile tilapia found a large genetic component in variability of body weight (Janhunen et al, 2012;Sonesson et al, 2013;Sae-Lim, et al, 2015a;Sae-Lim, et al, 2015b;.…”

Section: Social Interactions and Inherited Variabilitymentioning

confidence: 99%

Genetics of inherited variability : Increasing uniformity by reducing competition

Marjanović¹

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Social interactions are common for all living organisms. In animal breeding, these interactions are of interest as they are often a source of indirect genetic effects (IGEs). An IGE is a heritable effect of an individual on the trait value of another individual. In aquaculture populations and some plants, social interactions have an additional consequence -interactions in the form of competition inflate variability of trait values among individuals. The phenotypic variability of a genotype has been studied as a quantitative trait in itself, and is often referred to as inherited variability. The main objective of this thesis was to study the genetics of inherited variability, with a focus on the relationship between competition (i.e., IGEs) and variability. In the thesis, we used Nile tilapia as a model species. We found that variability of body weight and body size traits in Nile tilapia is heritable, and shows a large genetic coefficient of variation, which offers good opportunities for improvement of uniformity by means of genetic selection. To study the genetic relationship between social interactions and variability, we developed a quantitative genetic model that integrates both phenomena. In this model, interactions between social partners lead to divergence (competition) or convergence (cooperation) of their phenotypes (e.g., body weight) over their life time. The effects of social interaction in the model are heritable and can evolve. These effects comprise direct genetic effect of the focal individual and IGE of its social partner. With a simulation study we showed that the model yields increased variability of body weight with increase of competition, similar to what is observed in real aquaculture populations. Selection for cooperation will therefore lead to decreased variability. These findings suggest that IGEs may be creating an entire level of genetic variation in variability, that has so far been overlooked. Using existing statistical models, we show that direct genetic effects of competition on variability could be captured with a direct model of inherited variability, and similarly, IGEs of competition could be captured with an indirect model of inherited variability. According to kin selection theory individuals should show better social behavior, i.e., less competition, towards relatives, which should be reflected in their body weight and the variability thereof. We tested this hypothesis by comparing two treatments in an experiment, in which tilapia were reared in either kin or in non-kin groups. Individuals had significantly higher body weight in kin groups, however, there was no difference in variability of body weight between the two treatments.Findings of this thesis demonstrate that variability of body weight in tilapia is heritable and that genetic variation in variability may comprise not only direct genetic effects but also IGEs. Studies focusing on evolution of variability/uniformity, therefore, should consider IGEs.

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