Tench are warmwater fish that slow down in cold, but get hungry and active in summer (about 16–22 °C). In warm water, a tench’s body works faster. That means they digest food more quickly. In fact, research shows that cool, cold water slows fish digestion, while warmer water speeds it up (pmc.ncbi.nlm.nih.gov). For example, one review found that a fish at ~20 °C processed food in far fewer hours than when it was cold (pmc.ncbi.nlm.nih.gov). In practical terms, this means a tench can gobble bait, digest much of it within hours, and be ready to eat again sooner in summer weather.
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