Agonistic behaviour in the long‐snout seahorse: A gentlemanly challenge

Territorial defence is a relatively common behaviour in reef fish. Aggression typically occurs between individuals of the same sex, given that members of the opposite sex may represent potential breeding partners. Seahorses are cryptic reef fish with typical sedentary behaviour, especially during the male pregnancy. In this context, we investigated the agonistic behaviour of pregnant seahorses, Hippocampus reidi , towards other males, pregnant...