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.
Biotesting
Environmental quality assessment using living organisms.Biotesting is a method of determining enviro..
Biotic factors
These are different types of relationships between living things. They can be either intraspecific o..
Biotope
An area of water body characterised by relatively homogeneous environmental conditions and occupied ..
Biotype
A group of individuals in a population united by a similar genotype.A group of organisms belonging t..
Bipolar species
Found in the temperate waters of the southern and northern hemispheres, but not in the tropics (anch..
Biserial fin
Biserial fins are typical of keratosis (an extinct genus of bipedal fish). The paired fins of Porole..
Bjef
The stretch of river above or below a hydraulic structure (dam). The section below the dam is called..
Black carp
The black carp (Mylopharyngodon piceus) is a freshwater fish of the carp family. It is the only spec..
Blicca bjoerkna
Blicca bjoerkna is a freshwater fish of the carp family. Length up to 35 cm, weight up to 1.3 kg, us..
Blocking
Blocking - the piling up of ice in a river channel during an ice drift that can lead to flooding.Stu..
Body length is absolute
Body length is absolute - defined as the distance from the tip of the snout to the outermost rays of..
Body temperature of fish
The body temperature of fish - inconstant, depends on water temperature. For example, in carp, tench..
Bonification reservoir
Integral assessment of the natural qualities and suitability of the water body for different forms o..
Bony scales
Three forms of scales are distinguished: placoid, ganoid, and bony.Bony scales are rounded bony plat..
Boreal region
Latin borealis, from the Greek boréas, northern.The geographical area of the world's oceans lying be..