How do fish fall in love? 魚如何表達愛意?

As humans, we may hold her hands, hug, kiss

or make love. In common, they are physical intimacy gestures. Fish, they can only use their gill to touch each other.
人類表達愛意會拖手，擁抱，接吻或做愛。大家的共通點是有肌膚的接觸。而魚也一樣，牠們會用鰓來互磨。