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.
Hybrid
From the Latin hibrida, hybrida, "interbreeding.An individual derived from the crossing of female an..
Hybridization of fish
By crossing individuals of different species and genera, it is possible to obtain organisms with a u..
Hydrobiology
Science that studies aquatic organisms (population of the hydrosphere) in interaction with the envir..
Hydrobionts
Latin Hydrobiontes; from Ancient Greek ὕδωρ - water + biont.Living organisms (animals, plants, and b..
Hydrochemistry
The science that studies the chemical composition of natural waters, its changes in time and space, ..
Hydrogen Index (pH)
The hydrogen index (pH, from Latin pondus Hydrogenii — "weight of hydrogen") is a measure of the aci..
Hydrographic network
The set of rivers and other temporary or permanent watercourses and reservoirs in a given territory...
Hydrology
Greek Yδρoλoγια; from Ancient Greek ὕδωρ "water" + λoγoς "word, doctrine.The science that studies th..
Hydroponics
Hydroponics is a subset of hydroculture which involves growing plants, usually crops or medici..
Hydrosphere
From the ancient Greek hydro "water" + sphere "ball".The discontinuous water envelope of the globe, ..
Hydrothermal vent
Hydrothermal vent – an ocean bed site where hot, sulphur‐rich water vents from a geothermal source; ..
Hyostylia
From the New Latin hyoideus, sublingual, and ...stylium.A type of articulation of the jaw apparatus ..
Hypertensives
Organisms with a higher concentration of salts in their bodily fluids than in the environment. These..
Hypobate type of tail fin
The caudal fin is a fin located on the tail of many aquatic animals: non-pinnipeds, fish, some marin..
Hypolimnion
A cold, oxygen-poor layer of water in a lake or other body of water that lies below a zone of rapid ..