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.
Helminths
From the ancient Greek ἕλμινς, "parasitic worm," "worm".Helminths are a large group of organisms tha..
Herbicides
From the Latin herba, herb, and caedo, to kill.Chemicals used to selectively or completely kill unwa..
Herbivorous fish
Herbivorous fish - fish that feed mainly on aquatic vegetation - phytoplankton and macrophytes (silv..
Hermaphrodite
An organism with male and female characteristics. Widespread among leeches, bristleworms, gastropods..
Hermaphroditism
After the Greek god Hermaphrodite of the ancient Greek Ἑρμαφρόδιτος.The presence of both male and fe..
Heterocercal caudal fin
From Hetero... and Greek kérkos - tail.Asymmetrical fin with different sized lobes, end of spine sha..
Heterodonticity
Heterodontism; heterogeneous + Greek odus, odontos tooth. Differences in the shape and size of teeth..
Hexagrammidae
Hexagrammidae is a family of fishes of the order Scorpaeniformes. 7 genera, 14 species, including on..
Hibernation
Hibernation - a period of life of fishes, evolutionary fixed way of fishes in unfavourable period of..
Hierarchical classification
Hierarchical classification - arrangement of taxonomic categories representing a group of animals (f..
Higher crayfish (Malacostraca)
A subclass of crustaceans. Has a constant number of segments in the head, thoracic and ventral parts..
Holostei
Holostei- a superorder of fishes of the subclass Actinopterygii of the class Osteichthyes. The axial..
Hucho taimen
Hucho taimen is a freshwater fish of the salmon family. Length up to 1.5 m, weight up to 60 kg. The ..
Humic substance
Humic substance - acids (humic, ulmic, fulvic), which are part of the dark colored aqueous humus, wh..
Humified pond
It is characterised by a high content of difficult-to-decompose, high-molecular-weight humic acids f..