Some effects of water temperature on fish

We know that fish is a temperature-changing animal, and its body temperature changes with the change of water temperature. Therefore, water temperature has a close relationship with the growth, development, reproduction, activity and foraging of fish.

In the hot summer, the water temperature is above 30 degrees Celsius. Except for a few heat-loving fish (such as grass carp, silver carp, etc.), most fish hide in the deep water or in the shade to escape the heat and unintentionally forage. Severely cold winter. The temperature of the water surface is very low, and the temperature of the bottom is relatively high, so the fish enter deep pools or mud caves, hibernating, and do not want to eat.

At the same time, different fish have different metabolic functions. Therefore, different types of fish have a suitable temperature layer for their own metabolic functions. For example, the temperature of crucian carp is 15-25 degrees Celsius; carp and catfish are 20-25 degrees Celsius; grass carp is 25-30 degrees Celsius; bream is 15-30 degrees Celsius; silver carp is 22-32 degrees Celsius;

Tilapia is 20 to 35 degrees Celsius; turtle is 17 to 32 degrees Celsius. Within this suitable water temperature range, the fish have the strongest activity function, strong appetite, and large food intake. When the water temperature exceeds or falls below this temperature layer, The activity function of the fish is weakened, and the food intake decreases accordingly. Generally speaking, the most suitable water temperature for freshwater fish is 15~25 degrees Celsius. In this temperature range, most fish like to move in shallow or mid-deep water. When the water temperature drops below 5 degrees Celsius, most fish swim slowly, eat very little or stop eating. If the water temperature drops again, the fish will dive into the bottom of the deep water, in a dormant or semi-dormant state.

July 15, 2021 — Charlotte L