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.
Remora
Remora (Echeneidae) is a family of fishes of the order Perciformes. Includes 6 genera, 7 species. Th..
Reproduction
Reproduction is a link in the life cycle of fish that ensures the existence of the species through r..
Reserve
Reserve - natural specially protected territories or water areas, completely taken out of economic u..
Reservoir
An artificial reservoir with a volume of more than 1 million m3, the level and water exchange of whi..
Residential fish
Resident fishes are an ecological group of freshwater fishes that stick to the same habitats all the..
Resistance of the organism
From Latin resistentia - resistance, opposition.Resistance of the organism - the ability of the orga..
Respiratory organs
Respiratory organs - gill apparatus, providing oxygen to the body. The shape of the gills depends on..
Retractable mouth
It is characterised by a mobile connection of the upper jaw to the skull. The premaxillary and often..
Rheobiont
From the Greek rhéos - current, stream and Biont.Rheobiont - hydrobionts living in flowing waters (t..
Rheophilic organisms
From the Greek rhéos - flow, stream and philéo - love.Rheophilic organisms are hydrobionts whose dev..
Rheotaxis
From the Greek rheos - flow, stream and taxis - location.Rheotaxis - movement of fish fry against th..
River basin
An area of the earth's surface occupied by the main river and all its tributaries, from which surfac..
River crayfish
River crayfish are two families of the decinate crayfish family (Reptantia: Astacidae and Parastacid..
River eels
The river eels (Anguillidae) are a family of the order Eels (Anguilliformes). 1 ..
River fish
River fishs are fish species that live permanently in rivers and only occasionally enter flowing lak..