The Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) is a marine (saltwater) fish in the Acipenseridae family.
The Atlantic Sturgeon is elongated, similar to a shark. It has smooth scaleless skin, whereas most fish have scales. It has five lateral rows of bony plates called scutes.
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The Redtail Catfish (Phractocephalus hemioliopterus) is a freshwater fish in the Pimedodidae family of long-whiskered catfish. It is a pimelodid.
The Redtail Catfish has a brownish spotted back with yellow sides and underbelly, and a red tail. Its body is elongated with a broad, flattened head. It has a pair of barbels (long fleshy, string structures) on the upper jaw and two pairs of barbels on the lower jaw.
Fish have scales, but the Redtail Catfish does not have scales. Instead of scales, it has slippery mucous-covered skin with bony plates called scutes.
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The Loach Catfish (Amphilius grandis) is a freshwater fish in the Amphiliidae family of catfish.
The Loach Catfish has an elongated, cylindrical brownish body. It has barbels at the corner of its mouth. It has a broad, flattened head that enables it to dig through the soil for food. Fish have scales, but the Loach Catfish does not have scales. Instead of scales, it has slippery mucous-covered skin with bony plates called scutes.
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The Russian Tortoise (Agrionemys horsfieldii) is a small chelonian reptile in the Testudinidae family. It is also known as the Afghan Tortoise, the Central Asian Tortoise, Horsfield’s Tortoise, the Steppe Tortoise, or the Four-Clawed Tortoise.
The Russian Tortoise can be various colours, but it usually has a brown or grey-black top dome-shaped shell, called a carapace. It has faded yellow-beige markings between its scutes (scales). It has a paler bottom shell, called a plastron. Its body is straw-yellow and brown. It has a small head and brown eyes. It has four toes on its thick, stumpy legs.
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The Siberian Sturgeon (Acipenser baeri) is a freshwater fish in the Acipenseridae family.
The Siberian Sturgeon is elongated, similar to a shark. It has smooth scaleless skin (unlike fish that have scales). It has five lateral rows of bony plates called scutes.
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