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.
Tunny, Little
Latin name Euthynnus alletteratus Other names Little tuna, Atlantic little tunny, false albacore,..
Two-layer lake
From the ancient Greek μέρος 'part' and μίξις 'mixture'.A body of water in which there is virtually ..
Two-year-old fish
Larva - from the moment of mixed feeding to the beginning of laying scales.Fry - the entire body is ..
Two-yearling
At the pecking stage, the fry are 3 to 6 mm in size. After wintering it is called a yearling, and by..
Ultraabyssal
From the Latin ultra - over, more and the Greek abyssos - bottomless.Ultraabyssal - the sea floor ab..
Ultraabyssopelagial
The ultraabyssopelagic is the layer of water that covers the deepest parts of the seabed, at depths ..
Ultraplankton
Plankton is a collection of organisms inhabiting the water column. It is represented by plant (phyto..
Uniserial fin
Uniserial fin - a special plan of structure of pectoral and pelvic fins of keystepper and cartilagin..
Unscreened roe
Unscreened roe - prepared from unripe caviar of sturgeon and salmon fish. Due to the impossibility o..
Upper Mouth
There are three types of mouth in fish:Upper (semi-top) mouth - the lower jaw protrudes upwards (ven..
Urostyle
From the ancient Greek urá 'tail' and stýlos 'stick'.Urostyle - fused into a stick-shaped ossicle of..
Variability
Variability is one of the main properties of a living organism to acquire new features and propertie..
Varicorhinus
Varicorhinus is a freshwater fish of the carp family. It is distributed mainly throughout Africa and..
Vendace
Vendace are two species of fish in the genus whitefish, family Whitefish.European (Coregonus albula)..
Venom-bearing fish
Venom-bearing fish - a group of fishes that have a venomous apparatus consisting of spines, barbed f..