Some bony tongues and their relatives are nocturnal (nahk-TER-nuhl), often hiding during the day in dense plant cover or under other kinds of cover and coming out to hunt in the evening. Others are active during the day, spending most of their time patrolling very close to the surface. During the summer, when the water surface becomes very hot, the fishes stay in deeper, cooler areas. Most bony to…
Physical characteristics: Freshwater butterflyfishes (also called but-terflyfishes) are called that because their large pectoral (PECK-ter-uhl)fins, the front set of paired fins, look like the wings of a butterfly. The pelvic fins, the rear set of paired fins, have long rays that are not covered with skin. The fanlike tail fin is quite large. Freshwater butterfly-fishes reach a length of 3.9 inche…
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