The largest fin on a perch is the leading dorsal fin. It's located on the back of the fish, before the second soft-rayed dorsal fin.Continue Reading
Perch typically have two dorsal fins: a leading dorsal fin and a second dorsal fin. The leading dorsal fin is more rigid and usually contains six to 15 spines. The second dorsal fin is soft-rayed and does not contain spines. The two fins can be separate or joined together.
Perch belong to the largest and most diverse order of fish called Order Perciformes in the subclass Actinapterygii. Fish in this category commonly have fins supported by spines or jointed rays.Learn more about Fish
The gender of male and female blue catfish can be determined by the distinctive humps that appear on the backs of the males between the dorsal fins and the head. The females are more streamlined and can reach any size, but the males start developing these distinctive humps once they reach 10 pounds. The males also have more rounded heads.Full Answer >
While a whale's fins are similar in structure and function to those of a fish, whales and fish are not closely related, so their similarities are defined as analogous, not homologous. The development of fins in two such unrelated animals is an example of convergent evolution.Full Answer >
Male Jack Dempsey fish are significantly larger than the females and boast slightly longer fins. The brilliant pattern of metallic spots on males is also more colorful than the pattern found on females. The tail, anal and dorsal fins of males are pointed, but the fins of female fish are slightly rounded.Full Answer >
The mangrove snapper is a moderately large snapper fish characterized by its dark brown or gray color with red spots, its two prominent canine teeth and its red-bordered dorsal fins. The mangrove snapper is also known as the gray snapper. It is native to the Atlantic Ocean.Full Answer >