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DescriptionThe two-spotted cling fish is a small fish, reaching a maximum of 6 cm in length. They cling on rocks by means of a powerful sucker formed from the pelvic fins. Their colour is variable and brilliant. The body is often red with numerous spots of blue, violet, brown and yellow extending under the belly. Males have a purple spot circled with yellow behind pectoral fin. The head is relatively small, and more or less triangular in shape. There is a single dorsal and anal fin, both set far back near the tail.The two-spotted cling fish can be confused with the small-headed cling fish Apletodon microcephalus. They can be told apart by looking at the teeth. The two-spotted cling fish lays its eggs in spring and summer on the underside of a shell or under stones and these are guarded by the parents. It feeds mainly on benthic organisms.