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Isome – A soft, biodegradable hook bait which is generally worked slowly on LRF tackle. The name comes from the Japanese word for sand worm and these baits or lures…

Ichthyology – The scientific study of fish.

Ice fishing – A specialized form of fishing through holes cut in the ice of frozen-over waters.

Impact shield – A plastic, conical, bait retaining device that protects the bait during the cast.

IGFA – International Game Fishing Association is an American based organisation which maintains world record for fish in particular those caught on a particular breaking strain of line.

IFSA – The governing body for sea angling in Ireland. Selects international teams for Home Internationals and CIPS events.

Inshore – The region where waves are transformed by interaction with the sea bed.

Invertebrate – A creature that has no backbone, for instance a crab, octopus or a worm.