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.


Iridocytes

Iridocytes

Greek iris (iridos) rainbow + kytos cell.Iridocytes - large, oval-shaped cells, have no pigment grai..

Iris

Iris

Latin iris, from Ancient Greek ἶρις "rainbow".The iris is the colored part of the eye surrounding th..

Irrigation fish farming

Irrigation fish farming

Irrigation fish farming is a special type of farming.Fish farming in irrigation reservoirs - include..

Isobate type of caudal fin

Isobate type of caudal fin

The caudal fin is a fin located on the tail of many aquatic animals: jawless animals, fish, some mar..

Isobath

Isobath

From the Greek isos - equal and bathos - depth.Isobath - a closed curve on the map passing through p..

Jawless (Agnatha)

Jawless (Agnatha)

A subclass of the most primitive vertebrates, lacking true jaws and paired limbs. The chord is retai..

Jugular fin arrangement

Jugular fin arrangement

Jugular fin arrangement - observed in fish that have pelvic fins located on the pharynx.The pelvic f..

Juvenile fish

Juvenile fish

Juvenile fish - postlarval stage of fish development, during which immature fish change body proport..

Keel

Keel

It's Latin for carina.The keel is the sharp edge of the belly, less often the sides of the caudal pe..

Krill

Krill

Krill is a commercial name for small marine crustaceans that serve as food for whales, fish, seabird..

Labridae

Labridae

Labridae is a family of fishes in the order Perciformes. About 60 genera and more than 300 species a..

Labyrinth

Labyrinth

The labyrinth, an auxiliary organ of respiration, is a chamber in the region of the first gill arch...

Lake length

Lake length

Lake length is the shortest distance between the two most distant points of the shoreline. Depending..

Lancetes

Lancetes

Lancetnidae (Branchiostoma) - a genus of small to 8 cm long marine animals with lanceolate transluce..

Larva

Larva

Fish larva - post-embryonic stage of fish development from the moment of the beginning of mixed feed..

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