Genetic variation in feed consumption, growth, nutrient utilization efficiency and mitochondrial function within a farmed population of channel catfish (Ictalurus punctatus)

Eya, Jonathan C.; Ashame, Martha F.; Pomeroy, Charles F.; Manning, Bruce B.; Peterson, Brian

doi:10.1016/j.cbpb.2012.05.019

Cited by 25 publications

(30 citation statements)

References 45 publications

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“…lower RCR) within the intestine could have contributed to the low food intake, because this would have resulted in limited production of ATP for nutrient absorption, nutrient transport and protein synthesis (Pelletier et al, 1994). Since the digestive track is involved in the central regulation of food intake (Jordi et al, 2015;Lin et al, 2000), the low food intake may also reflect a more general drop in intestinal function (Eya et al, 2012), but this requires further study. The mitochondrial respiration rate of aquatic ectotherms is known to vary with temperature in vitro (Pörtner et al, 1999) and changes in water temperature can induce adjustments in mitochondrial respiratory capacities in fish (Chung and Schulte, 2015;Fangue et al, 2009;Iftikar and Hickey, 2013;Iftikar et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…To test these hypotheses, we assessed the relationship between the mitochondrial respiratory capacities of liver and white muscle (tissues that are likely to influence whole-organism performance; Bottje and Carstens, 2009;Eya et al, 2012;Rawson and Friedman, 1994), and feeding ability and growth rate in juvenile brown trout (Salmo trutta) maintained near their upper lethal thermal limit, where average food intake starts to decline (Elliott, 1976).…”

Section: Introductionmentioning

confidence: 99%

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Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity

Salin

Auer

Anderson

et al. 2016

Journal of Experimental Biology

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Animals, especially ectotherms, are highly sensitive to the temperature of their surrounding environment. Extremely high temperature, for example, induces a decline of average performance of conspecifics within a population, but individual heterogeneity in the ability to cope with elevating temperatures has rarely been studied. Here, we examined inter-individual variation in feeding ability and consequent growth rate of juvenile brown trout Salmo trutta acclimated to a high temperature (19°C), and investigated the relationship between these metrics of whole-animal performances and among-individual variation in mitochondrial respiration capacity. Food was provided ad libitum, yet intake varied ten-fold amongst individuals, resulting in some fish losing weight whilst others continued to grow. Almost half of the variation in food intake was related to variability in mitochondrial capacity: low intake (and hence growth failure) was associated with high leak respiration rates within liver and muscle mitochondria, and a lower coupling of muscle mitochondria. These observations, combined with the inability of fish with low food consumption to increase their intake despite ad libitum food levels, suggest a possible insufficient capacity of the mitochondria for maintaining ATP homeostasis. Individual variation in thermal performance is likely to confer variation in the upper limit of an organism's thermal niche and might affect the structure of wild populations in warming environments.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity

Salin

Auer

Anderson

et al. 2016

Journal of Experimental Biology

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“…), which may have buffered the expression level of this cytochrome c oxidase subunit from the liver, given that the level expression of a given gene may vary substantially among tissues (Eya et al. ). Also, patterns of expression are expected to vary between life‐history stages (Nolte et al.…”

Section: Discussionmentioning

confidence: 99%

Stocking impacts the expression of candidate genes and physiological condition in introgressed brook charr (Salvelinus fontinalis) populations

Lamaze

Garant

Bernatchez

2012

Evolutionary Applications

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Translocation of plants and animal populations between environments is one of the major forms of anthropogenic perturbation experienced by pristine populations, and consequently, human-mediated hybridization by stocking practices between wild and exogenous conspecifics is of increasing concern. In this study, we compared the expression of seven candidate genes involved in multifactorial traits and regulatory pathways for growth as a function of level of introgressive hybridization between wild and domestic brook charr to test the null hypothesis of no effect of introgression on wild fish. Our analyses revealed that the expression of two of the genes tested, cytochrome c oxidase VIIa and the growth hormone receptor isoform I, was positively correlated with the level of introgression. We also observed a positive relationship between the extent of introgression and physiological status quantified by the Fulton's condition index. The expression of other genes was influenced by other variables, including year of sampling (reflecting different thermal conditions), sampling method and lake of origin. This is the first demonstration in nature that introgression from stocked populations has an impact on the expression of genes playing a role in important biological functions that may be related with fitness in wild introgressed populations.

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“…Various factors can account for this. These include variations in metabolic rate (Kolath et al, 2006;Eya et al, 2012;Fuentes et al, 2013) and differential capacities to induce protective responses such as metallothionein production (Kalman et al, 2010) or oxidative stress defense (Hauser-Davis et al, 2012;Srikanth et al, 2013), as well as differences in Cd uptake and bioaccumulation. In regard to the latter, significant cross-species differences in Cd uptake rates have been reported (Niyogi and Wood, 2004;Wang and Rainbow, 2008) and fishes from higher trophic levels were shown to accumulate higher levels of some metals, with a positive relationship between species body weight and metal levels observed (Burger et al, 2002).…”

Section: Additional Considerationsmentioning

confidence: 99%

Development and application of the adverse outcome pathway framework for understanding and predicting chronic toxicity: II. A focus on growth impairment in fish

et al. 2015

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Adverse outcome pathways (AOPs) organize knowledge on the progression of toxicity through levels of biological organization. By determining the linkages between toxicity events at different levels, AOPs lay the foundation for mechanism-based alternative testing approaches to hazard assessment. Here, we focus on growth impairment in fish to illustrate the initial stages in the process of AOP development for chronic toxicity outcomes. Growth is an apical endpoint commonly assessed in chronic toxicity tests for which a replacement is desirable. Based on several criteria, we identified reduction in food intake to be a suitable key event for initiation of middle-out AOP development. To start exploring the upstream and downstream links of this key event, we developed three AOP case studies, for pyrethroids, selective serotonin reuptake inhibitors (SSRIs) and cadmium. Our analysis showed that the effect of pyrethroids and SSRIs on food intake is strongly linked to growth impairment, while cadmium causes a reduction in growth due to increased metabolic demands rather than changes in food intake. Locomotion impairment by pyrethroids is strongly linked to their effects on food intake and growth, while for SSRIs their direct influence on appetite may play a more important role. We further discuss which alternative tests could be used to inform on the predictive key events identified in the case studies. In conclusion, our work demonstrates how the AOP concept can be used in practice to assess critically the knowledge available for specific chronic toxicity cases and to identify existing knowledge gaps and potential alternative tests.

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Genetic variation in feed consumption, growth, nutrient utilization efficiency and mitochondrial function within a farmed population of channel catfish (Ictalurus punctatus)

Cited by 25 publications

References 45 publications

Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity

Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity

Stocking impacts the expression of candidate genes and physiological condition in introgressed brook charr (Salvelinus fontinalis) populations

Development and application of the adverse outcome pathway framework for understanding and predicting chronic toxicity: II. A focus on growth impairment in fish

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