In most areas in the world nature follows seasonality in one way or another. This affects both the physiology and behaviour of animals across different genera. As many fish species are poikilothermic, their internal temperature vary considerably as a result of fluctuations in ambient environmental temperature. In a changing climate, this dependency can have a severe impact on natural and captive fish populations when fast drops or rises in environmental temperatures occur, occasionally over a short period of time.

The variations in body temperature have a pronounced impact on both speed and efficiency of fish metabolism. In this respect, fish metabolism is increased in higher temperatures and vice versa. Consequently, the feed intake as well as nutrient digestibility and nutrient utilization of fish vary with temperature.

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