Large-tooth Flounders


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Large-tooth flounders, flounders, flatfishes, sanddabs, and whiffs are the common names for the members of the Paralichthyidae family. The family members have both eyes on the left side of their head and lateral line present below their lower eye. There are no spines in their pectoral and pelvic fins. Their pelvic fin bases are short and nearly symmetrical on both sides of the body.

Members of the Paralichthyidae are found in the Africa, Indian and Pacific waters. There are 14 genera and 112 species worldwide. They commonly inhabit shallow marine waters on mud and sand bottoms. Some species occur in brackish waters near river mouth but they are rarely found in freshwater. They feed mostly on small crustaceans and other bottom-living animals.


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Scientific Name: Pseudorhombus arsius  (Hamilton, 1822)
English Name: Largetooth Flounder
Mandarin Name: 大牙斑鮃 (Dàyá bān píng), 大齿斑鲆 (Dà chǐ bān píng), 比目鱼 (Bǐmùyú), 偏口鱼 (Piān kǒu yú), 左口鱼 (Zuǒ kǒu yú)
Local Malay Name: Ikan Sebelah, Sisa Nabi, Sebelah Gigi Besar
Main Diagnostic Features: A dark blotch at junction of straight and curved parts of lateral line, and another blotch half-way to caudal-fin base. Dorsal fin with 71 to 84 soft rays, anal fin with 53 to62 soft rays, pectoral fin on eyed side with 12 or 13 rays.
Size: Maximum standard length 45 cm, commonly to 30 cm.