External anatomy of a fish

In order to avoid running afoul of games laws, a fisherman must be able to identify his catch. Knowing the basic external anatomy of fish is esential when trying to make an identification using written descriptions.

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The size, shape and position of fins is perhaps the best identifying characteristics of fish

The Lateral line is a sensory organ consisting of a series of pores on the side of a fish which allow it to detect vibrations and sense changes in water temperature and pressure. It serves a number of functions such as alerting the fish to approaching predators, food opportunities and it allows schooling fish to maintain their position within the school even when the group engages in a sudden change of direction.