Tropical Fish Behaviour and Training Guide

Understanding normal behaviour

Fish cannot be trained in the same way as a dog^★, but owners can encourage natural behaviour through a suitable environment and consistent feeding routine. Learn how each species normally swims, feeds, hides and interacts with other fish. RSPCA notes that some tropical fish are shoaling species and may become stressed when kept in unsuitable numbers, while other fish are territorial or aggressive.

Encouraging natural behaviour

Aquarium layout can support normal behaviour. Provide open swimming space where required, hiding places for timid fish and suitable areas for species that establish territories. Feed consistently and avoid creating intense competition for food. If a fish repeatedly hides, chases others, refuses food or changes its swimming pattern, check water quality and compatibility before assuming it is simply misbehaving.

When behaviour changes

Behavioural changes can be an early sign of stress or illness. OATA recommends watching swimming, temperament, breathing, colour, appearance and feeding. Test the water whenever behaviour changes and review recent additions, maintenance^★ or stocking. The goal is not to make fish perform tricks but to create conditions in which their normal species-specific behaviours can be expressed without persistent stress or aggression.