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 ... More » Pets & Animals Marine Life Fish

Pelvic fins can serve multiple purposes depending on the species of fish, like sharks use them for balance when swimming and on males they are part of the sexual organs, but fish like the O'opu in Hawaii use them to navi... More » Science Biology Zoology

Fish use the caudal fin to generate swimming power and aid in maneuverability. The shape of the caudal fin, which is also known as the tail fin, determines a fish's swimming speed and movement. More » Pets & Animals Marine Life
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Homologous structures, such as the fins of whales and the hands of monkeys, demonstrate that while a species may use structures for different purposes, the species shared a common ancestor. By definition, homologous stru... More » Science Environmental Science

Identify a fish based on the type of water it lives in, the geographic location, its body shape and color, the placement of its fins, and the absence or presence of scales. The placement of other body structures, such as... More » Pets & Animals Marine Life Fish

Some of the signs and symptoms used to diagnose disease in fish include inactivity, frayed fins, loss of color, erratic swimming and difficulty breathing, states FishNet. Other indications of disease can be open sores, b... More » Pets & Animals Marine Life Fish

Male fish may have larger pectoral fins and small white spots on their heads and pectoral fins. Female fish may be larger and rounder than males. More » Pets & Animals Marine Life Fish