English: A juvenile threespot dascyllus (Dascyllus trimaculatus) of approx 4 centimetres (1.6 in) length in a magnificent sea anemone (Heteractis magnifica), Red Sea, Egypt. Dascyllus trimaculatus is native to the Indo-Pacific from the Red Sea and East Africa, to the Pitcairn Islands, southern Japan, and Australia, and can also be found in some parts of the Philippines. It feeds on algae, copepods and other planktonic crustaceans. Generally, adults are found in small groups around coral heads or large rocks. Juveniles (like in this case) may be found associated with large sea anemones or sheltering between the spines of diadema sea urchins or branching corals. The magnificent sea anemone is characterized by a flared oral disc, which reaches between 20 and 50 centimetres (7.9 and 19.7 in) in diameter. The numerous tentacles exceed 8 centimetres (3.1 in) long. It's widespread throughout the tropical and subtropical waters of the Indo-Pacific area, from the eastern coasts of Africa, the Red Sea included, to Polynesia and from south Japan to Australia and New-Caledonia. It has been observed down to 40 metres (130 ft) deep. The magnificent sea anemone has two feeding methods. The first one is through the photosynthesis of its symbiotic zooxanthellae, living in its tissues. The second method is through using its tentacles to stun, immobilize, and consume prey (small invertebrates, fry, or juvenile fish).