ichthyology – The science or study of fish.
IGFA – The International Game Fish Association.
inactive fish – Fish that are not in a feeding mood, sometimes referred to as having “lockjaw.” Examples of inactive times can be following a cold front, during a major weather change that causes a sudden rise or fall in the barometer.
in-line spinner – A spinner where the hook is on the same shaft, or line, as the spinner, such as a Mepps, Rooster Tail, Panther Martin or Vibrex spinner.
inside bend – The inside line of a grass bed or a creek channel.
isolated structure – A possible holding spot for fish, especially bass. Examples include a single submerged bush or rock pile on a point, a mid-lake hump, or a large tree that has fallen into the water.