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I.D.: An abbreviation for inside diameter, used when measuring tubing dimensions.

Ich: A very common parasitic disease characterized by white salt-like specks all over the fish.

Ichthyophthirius: Also known as Ich or Ick. See Ich.

Ick: See Ich.

Immature: The larva or pupa of an insect.

Imprinting: The process through which young fry "memorize" details about their home streams. As adult spawners, they use this knowledge to find their way back and to care for their own young.

Incised: Cut into or carved.

Incomplete Metamorphosis: A developmental process in the life cycle in which no pupal stage preceded the adult.

Indicator Species: A species of plant or animal whose presence in an ecosystem is a sign that the ecosystem is healthy, or ecologically balanced.

Infauna: Animals that live buried in the sediment and that are large enough to displace sedimentary grains.

Infaunal: See Infauna.

Infiltration: The downward entry of water into the soil. The infiltration rate is a function of surface wetness soil texture, surface residue cover, irrigation application or precipitation rate, surface topography and other factors.

Inner Lip: The portion of a shell around the left side of the aperture in a gastropod.

Inner Reef: Tthe part of a barrier reef or atoll that faces the lagoon.

Instar: The individual insect between two molting events.

Interaction: The result of one thing acting on another.

Interdependent Relationship: A type of relationship wherein both or all members of a relationship are dependent on one another.

Internal Filter: A filtration unit that is kept inside the aquarium. Examples include undergravel filters and sponge filters.

Interspaces: Spaces in-between the sculpture on a shell.

Interspecific Competition: Condition in which one species' exploitation of a limiting resource negatively affects another species.

Interstitial: Living within the pore spaces among sedimentary grains in a soft sediment or interspersed deeply among bottom substrate particles.

Invertebrate: Commonly called inverts by many in the hobby. Invertebrates are animals without backbones. Examples include anemones, corals, shrimps, snails, and crabs.

Iodine: A trace element necessary to life in very small quantities, but deadly at higher concentrations. Because it is removed by protein skimming, it must be added regularly on skimmed tanks. It is especially needed by crustaceans to successfully molt and soft corals for growth.

Iron (Fe): The most important trace element for plants. Iron deficiency causes Chlorosis; a disease that makes the plant leaves Yellow. The MCL is 0.3 mg/L.

Isotonic: Refers to having the same overall concentration of dissolved substances as a given reference solution.
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