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.
Availability of fish
Fish availability is the proportion of the population living in an area where it can be taken by the..
Average depth
Depth of an average body of water - determined by the ratio of the volume of the lake's water mass t..
Backwater
Backwater - is a small bay with a slow, and in low season practically absent current, formed by stee..
Baer's Law
Baer's Law - explains the causes of asymmetry of river valleys. As a result of the deflecting effect..
Bagridae
Bagridae is a family of fishes of the Siluriformes. It has more than 15 genera, about 50 species. Fr..
Balitoridae
Balitoridae (River loaches) are a family of fishes of the Cyprimiformes. Body le..
Ballerus ballerus
Ballerus ballerus is a freshwater fish of the bream genus, carp family. It inhabits the basins of th..
Bar
A sandy underwater shoal at the mouth of a river, formed as a result of sedimentation of river and s..
Barbatula
Barbatula is a genus in the family Balitoridae. Length 13-15 cm, weight 20-25 g. The body is bare or..
Bastard sturgeon
The bastard sturgeon (Acipenser nudiventris) is a passage fish of the sturgeon family. It is the mos..
Bathibyonts
Marine organisms that live in the water column at great depths (from 500 m).Inhabitants of depths fr..
Bathyal
A zone of the ocean between the sublittoral and abyssal, the continental slope, within a depth of 20..
Batigraphic curve
A graph showing the change in water surface area or water volume with depth. Widely used in lake fis..
Batipelagial
Bathypelagic - the water column at depths of 200-500 to 3000 m, corresponding to the bathyal zone, a..
Batometer
A device for taking water samples from a given depth for hydrochemical and hydrobiological studies.I..