Dictionary of Ichthyology
This dictionary of ichthyology contains specialist terms used in the teaching of undergraduate students. The terms are arranged alphabetically for ease of reference.
In addition to ichthyology, terms from hydrobiology, zoology, anatomy, fish farming and other related disciplines are included.
Where terms have different interpretations, we have assigned the most common interpretation in our view.
This dictionary is constantly being added to and modified.
If you do not agree with the above interpretation of the Terms, please explain your understanding in the comments to these Terms.
We invite you to participate in the development of a modern ichthyological vocabulary.
We will consider any criticism and take it into account when describing dictionary terms.
Eurybate animals
From Evry... and the Greek bathos - depth.Eurybates - aquatic animals with a wide vertical range of ..
Eurybiont organisms
From the Greek ευρί — "wide" and the Greek βίον — "living".Eurybionts are hydrobionts that are able ..
Euryhaline fish
The ancient Greek εὐρύ is wide and the ancient Greek ἅλς is salt.Euryhaline fishes are fishes that a..
Eurynonic fish
Euryonic fish - fish that are able to live with varying levels of acidity in the aquatic environment..
Euryphagy
Euryphages are organisms that feed on a wide variety of food items. Almost all temperate fishes are ..
Eurythermal fish
Eurythermal fish are fish that can live in conditions where there are large fluctuations in ambient ..
Eurytopic fish
From Evry... and the Greek tópos is a place.Eurytopic fishes are widespread species inhabiting a var..
Euryxybiont fish
Euryxybionts are fish capable of living in conditions where the oxygen concentration in the water fl..
Eutrophication
From the ancient Greek εὐτροφία, good nutrition.Eutrophication (eutrophy) is an increase in biologic..
Excretory organs
The excretory organs are paired kidneys that serve for excretion of nitrogenous metabolic products (..
Exogenous nutrition
Exogenous nutrition is the consumption of external food (animals and plants) from the moment of the ..
Exometabolites
From exo... and the Greek metabole - change, transformation.Exometabolites are metabolic products th..
External gills
External gills are temporary, specific respiratory organs that function during the larval stage of f..
Eyelids
A fixed annular fold around the eye of most bony fish. Sharks have a blinking membrane (third eyelid..
Eyes
Eyes are the visual organs of fish that enable them to perceive light stimuli. Demersal fish have ey..