Rainbow trout adaptation to a warmer Patagonia and its potential to increase temperature tolerance in cultured stocks

Aquaculture Reports

Rodrigo Larraza¹  Mabel Orellana¹  Guillermo Mirenna¹  Sonia Alejandra Crichigno²  Víctor Enrique Cussac²  Miguel Angel Battini²  Leandro Aníbal Becker² 

[1] Centro de Salmonicultura Bariloche (CENSALBA), Universidad Nacional del Comahue (UNCO), Argentina;Instituto Patagónico de Tecnologías Biológicas y Geoambientales (IPATEC), Universidad Nacional del Comahue (UNCO) – Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Quintral 1250, Bariloche, 8400 Río Negro, Argentina;

关键词: Climate change;    Growth;    Oncorhynchus mykiss;    Preferred temperature;    Thermal tolerance;   

DOI  :  10.1016/j.aqrep.2017.11.001

来源: DOAJ

【 摘 要 】

The viability of rainbow trout Oncorhynchus mykiss (Walbaum, 1792) culture is being challenged progressively by global warming. Previous trials with Australian and Japanese rainbow trout lines suggested that improvements in thermal performance may be possible. Here, we hypothesized that strain-related differences in physiological response to temperature exist between a north Patagonian hatchery stock (CENSALBA), a Neotropical one (Criadero Boca de Río), and a thermal stream (Valcheta) population of wild introduced rainbow trout. This was tested by comparing, at 20 °C, the thermal preference, specific metabolic rate, thermal tolerance, growth, and condition on juveniles of the three strains, and on a Valcheta stream male x CENSALBA female F1 cross. Preferred temperature (PT) and loss of equilibrium temperature (LET, a measure of thermal tolerance) of Valcheta stream and F1 were significantly higher than those of CENSALBA, and the average PTs of Valcheta stream and F1 were higher than the 95% confidence interval of available reference data for rainbow trout. These results suggest that the F1, reared under standard hatchery conditions and selected by growth and thermal preference, presents higher thermal preference and higher thermal tolerance than the current CENSALBA hatchery stock. Introduction of this naturally adapted strain to hatchery stocks would likely result in the improvement of their temperature resistance to warmer waters. Current studies on adults of this F1 generation are underway.

【 授权许可】

Unknown