Spinecheek anemonefish (Premnas biaculeatus) Emerging from a sea anemone. The female is the larger fish in the centre. This species has a symbiotic relationship with sea anemone. The sea anemone provides the anemonefish a safe haven by protecting it from predators through its stinging tentacles. The fish is immune to the sting and cleans the anemone by feeding on parasites such as algae and zooplankton. These fish can grow up to 17cm. Photographed in Lembeh Strait, North Sulawesi, Indonesia.