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How large do trout-perches usually grow?
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paracanthopterygian
Oyster toadfish (Opsanus tau).
Trout-perches, which belong to the superorder paracanthopterygian, are small fish that do not grow very large. The largest species, Percopsis omiscomaycus, typically reaches about 15 cm (6 inches) in length, while the Percopsis transmontana grows to approximately 10 cm (4 inches) long.12