The Black Goby (Gobius niger) is a marine (saltwater) ray-finned fish in the Gobiidae family of gobies.
The Black Goby is mottled-black with large scales around its neck. In the breeding season, the male becomes very black. It has a black spot on the front end of its dorsal (back) fins. It has an elongated shape with a rounded snout (nose). It has two dorsal fins that are almost continuous and looks like one fin. The dorsal fin closest to the tail has 6 spines. It has bulging eyes.
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The Atlantic Mudskipper (Periophthalmus barbarus) is a marine (saltwater) fish in the Oxudercidae family. It is similar to the Goby. It is also found in freshwater and brackish water. It is amphibious – it can live in the water and on land – but it is not an amphibian (like a frog or toad) because it does not have lungs.
The Atlantic Mudskipper has a long brown or greenish body. During the mating season it develops coloured spots, such as red, green or blue. It has close-set, bulging eyes. It has forward fins that are similar to legs that enable it to walk, or skip, along the surface of the mud. It can even climb trees.
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