Seeing this, many people might be puzzled. Didn't the fish go to the bottom? They should start eating the bait soon, right?
That's not the case. Common freshwater fish like carp and crucian carp are among the lower vertebrates, aquatic cold-blooded vertebrates. Their actions are mostly controlled by reflex and instinct, without much conscious thinking.
Everyone understands reflex — reacting to stimuli, let's leave that aside for now.
Let's talk about the instincts of fish.
Fish live in water, and their actions are constrained by a few instincts engraved in their genes.
The first is the survival instinct. In harsh environments, fish will try to find places more suitable for survival, such as gravitating towards light, warmth, and oxygen.
The second instinct is the reproductive instinct. During breeding season, influenced by hormones, fish will migrate back to shorelines to find nests and grassy spots.
