From my point of view, changing weather from "warm" to "cold" will affect the fishes to finding their food. Always stop eating. But when the temperature go static or change become warmer, the fishes active again.
Think in the perspective of a fish.
Ground temperature is non of fish's interest, water temperature is 17degree C.
I'll swim to the deeper and warmer water.
Human wear more clothes, fish swim to warmer habitat.
Think in the perspective of a fish, brothers!!!!