Fish primarily show affection through physical interaction, specifically by rubbing against each other. They also demonstrate recognition of past social interactions.
This behavior highlights that fish possess social capabilities and can form bonds with other fish. While the concept of "love" can be subjective, the act of rubbing against one another suggests a form of affection and comfort, similar to how other animals display closeness. It is also important to note that their displays of "love" are likely tied to mating rituals, establishing dominance, or maintaining social cohesion within a school. Fish remember past interactions with others and behave accordingly.
In essence, fish communicate and strengthen their relationships by recognizing each other and physically interacting through rubbing.
