Glossary | I

Ichthyologists
zoologists who study fishes
Ichthyoplankton
planktonic fish larvae and suspended fish eggs
Incurrent
pertaining to a current that flows inward
Indicator species
a species whose presence, absence, or relative well-being in a given environment is indicative of the health of its ecosystem as a whole
Indigenous
native to a particular region or environment
Indirect development
having a larval stage of development
Inert
unable to move or act
Infanticide
killing of young
Inorganic
being or composed of matter that is not plant or animal
Insectivore
animal that primarily eats insects
Intertidal
the zone between high and low tides, exposed to and flooded periodically by tides.
Invertebrate
animals with no dorsal column of vertebrae; without a backbone
Iridescent
having or displaying rainbow-like colors
Iridocyte
cells or tissue containing reflective material, e.g., reflective cells on fishes' scales
Isopod
any member of the Order Isopoda of aquatic crustaceans; has six pairs of legs and a flat oval body