Using the wrong fishing equipment can harm fish in various ways. For example, using a hook that is too large for the fish species targeted can cause excessive damage to the fish's mouth, making it difficult for the fish to feed and survive after release. Similarly, using a fishing line that is too light can result in prolonged fights with the fish, leading to exhaustion and increased mortality rates. Improperly set drag on the reel can also cause the fish to break the line and swim away with a hook or lure stuck in its mouth, causing long-term harm.

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Topics covered in this question:

Fishing Techniques Fishing Equipment Fish Conservation