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.
Growing season
Vegetation is from the Latin vegetatio, to revitalise, to sprout.A period of the year characterised ..
Growth
Growth is a quantitative process associated with an increase in mass and linear size. In fish, a dis..
Guanine
Guanine with the formula C5H5N5O is a purine derivative consisting of a fused pyrimidine-imidazole r..
Gudgeon
Gudgeon (Gobio gobio) is a freshwater fish of the gudgeon genus, carp family. It is a gregarious riv..
Gymnocephalus
Ruffs (Gymnocephalus) are a genus of river and lake fish of the perch family. Freshwater bottom-dwel..
Gynogenesis
A method of reproduction in which the sperm, penetrating the egg, only stimulates its development, i..
Gyttja
From the Swedish gyttja.Lake-swamp or lagoonal silt deposits of organic origin containing large amou..
Habitat
Habitat is the part of nature surrounding an organism that has a certain influence on it. Habitats a..
Halfbeak
Halfbeak (Hemiramphidae) is a family of fishes of the Beloniformes. The body is elongated, arrow-sha..
Halobionts
From the Greek hals - salt and bion - living.Hydrobionts inhabiting water bodies with salinity above..
Halophilic fish
From the Greek ἅλς - salt and φιλέω - love.Salt-loving forms that prefer to live in waters with a hi..
Hatching fish embryos
The process of emerging from the egg. The hatching period depends on the species of fish and the wat..
Hearing and balance organ
The organ of hearing and balance - in real fish is represented only by the inner ear — a membranous ..
Heart
The heart is the central organ of the circulatory system, and its contractions control the circulati..
Helminthiasis
From the Greek helmintos - worm. Helminthiasis is a disease caused by helminths.There are many speci..