Male sergeant major (Abudefduf saxatilis) guarding a female's eggs. This fish is usually silver with black bars, but the colour of the male changes to blue when it is guarding the eggs. This fish can grow up to around 23 centimetres in length and is found in the Atlantic Ocean. It feeds on zooplankton, small fish and crustaceans and algae. Photographed in Bonaire, Netherlands Antilles, Caribbean.
Model release not required. Property release not required.