Ichthyologist Dictionary

A flock and a herd

A flock and a herd

A flock (shoal) is a temporary grouping of fish that exhibits unity of behavior. Packs are formed by..

Abdominal pores

Abdominal pores

     Abdominal pores (latin: pori abdominales) are small paired openings lying usuall..

Abdominal position of the fins

Abdominal position of the fins

The pelvic fins are located behind the pectoral fins (herring, carp, salmon).Abdominal fishes, those..

Abiotic

Abiotic

Abiotic – referring to non‐living structures, substances, factors, environments, etc...

Abiotic environmental factors

Abiotic environmental factors

Abiotic environmental factors are a complex of physical and chemical environmental conditions of org..

Absolute abundance

Absolute abundance

Absolute abundance –  the total number of a kind of fish in the population.Usually estimated fr..

Absolute conversion rate of food

Absolute conversion rate of food

Absolute conversion rate of food = an index calculated by dividing the quantity of food distributed ..

Absolute fecundity

Absolute fecundity

Absolute fecundity – total number of eggs in a female...

Abyssal fish

Abyssal fish

Abyssal fish are deep-sea fishes that live at considerable depths, from 3,000 metres and more. All f..

Abyssal zone

Abyssal zone

The abyssal zone or abyssopelagic zone (from the Greek  ἄβυσσος - ..

Abyssocottinae

Abyssocottinae

Abyssocottinae is a family of fish of the order Scorpaeniformes. Endemics of Lake Baikal. Abysssocot..

Abyssopelagic

Abyssopelagic

Abyssopelagic is a layer of water located above the ocean bed at depths of 3000-6000 m (abyssal)...

Achelata

Achelata

Achelata are members of the Decapoda order of crayfish (Decapoda). The body length is up to 60 cm. T..

Actinopterygii

Actinopterygii

Actinopterygii is a superclass of bony fishes. It unites more than 96% of living fishes. Their bodie..

Adaptation

Adaptation

Adaptation - the process (or its results, e.g. a structure) wherein individuals, populations or spec..

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