''Channichthys mithridatis'', the green icefish, is a species of marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

belonging to the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Channichthyidae The crocodile icefish or white-blooded fish comprise a family (biology), family (Channichthyidae) of notothenioid fishes, fish found in the Southern Ocean around Antarctica. They are the only known vertebrates to lack hemoglobin in their blood as ...

, the

crocodile icefish The crocodile icefish or white-blooded fish comprise a family (biology), family (Channichthyidae) of notothenioid fishes, fish found in the Southern Ocean around Antarctica. They are the only known vertebrates to lack hemoglobin in their blood as ...

es. It is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to the

Kerguelen Islands The Kerguelen Islands ( or ; in French commonly ' but officially ', ), also known as the Desolation Islands (' in French), are a group of islands in the subantarctic, sub-Antarctic region. They are among the Extremes on Earth#Remoteness, most i ...

in the

Southern Ocean The Southern Ocean, also known as the Antarctic Ocean, comprises the southernmost waters of the world ocean, generally taken to be south of 60th parallel south, 60° S latitude and encircling Antarctica. With a size of , it is the seco ...

Taxonomy

''Channichthys mithridatis'' was first formally described in 2008 by Gennadiy A. Shandikov with the type locality given as Kerguelen Island.

Fishbase FishBase is a global species database of fish species (specifically finfish). It is the largest and most extensively accessed online database on adult finfish on the web.

treats ''C. mithridatis'' as a valid species but ''

Catalog of Fishes Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously up ...

'' treats it as a

junior synonym In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The botanical and zoological codes of nomenclature treat the concept of synonymy differently. ...

of '' C. rhinoceratus''. The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

''mithridatis'' is a Latinisation of

Mithridates Mithridates or Mithradates (Old Persian 𐎷𐎡𐎰𐎼𐎭𐎠𐎫 ''Miθradāta'') is the Hellenistic period, Hellenistic form of an Iranian languages, Iranian theophoric name, meaning "given by Mithra". Its Modern Persian form is Mehrdad. It ...

, the King of

Pontus Pontus or Pontos may refer to: * Short Latin name for the Pontus Euxinus, the Greek name for the Black Sea (aka the Euxine sea) * Pontus (mythology), a sea god in Greek mythology * Pontus (region), on the southern coast of the Black Sea, in modern ...

in the

Hellenistic period In classical antiquity, the Hellenistic period covers the time in Greek history after Classical Greece, between the death of Alexander the Great in 323 BC and the death of Cleopatra VII in 30 BC, which was followed by the ascendancy of the R ...

who ruled over

Panticapaeum Pantikapaion ( , from Scythian 'fish-path'; ) was an ancient Greek city on the eastern shore of Crimea, which the Greeks called Taurica. The city lay on the western side of the Cimmerian Bosporus, and was founded by Milesians in the late 7t ...

, the modern city of

Kerch Kerch, also known as Keriç or Kerich, is a city of regional significance on the Kerch Peninsula in the east of Crimea. It has a population of Founded 2,600 years ago as the Colonies in antiquity#Greek colonies, ancient Greek colony Pantik ...

in the Crimea where the institute yugNIRO which studied Antarctic fisheries was based.

Description

''Channichthys mithridatis'' attains a maximum

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

of . The first

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

has spines and there are 32-34 dorsal fin rays while the

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

contains 30-32 soft rays. The overall colour of the body and head varies from light green to dark olive with the crown of the head being rather darker than the body. There are 3-4 darker cross bars, two of which are underneath the second dorsal fin, and are present on the body of some individuals. The lower part of the head and body are white. There are clear silver-white spots at the bases of the

pectoral fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish aquatic locomotion, swim. Apart from the tail or caudal fin, fish fins have no direct connection with the vertebral column ...

s and between the

pelvic fin Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hi ...

s. Males are darker than females.

Distribution, habitat, and biology

''Channichthys mithridatis'' is a

bathydemersal Demersal fish, also known as groundfish, live and feed on or near the bottom of ocean, seas or lakes (the demersal zone).Walrond Carl . "Coastal fish - Fish of the open sea floor"Te Ara - the Encyclopedia of New Zealand. Updated 2 March 2009 T ...

species which is endemic to the Kerguelen islands in the Southern Ocean. It is found at depths of where it feeds on other fishes. Females are sexually mature when they reach a total length of .

Fisheries

''Channichthys mithridatis'' is caught using bottom trawls.

References

{{Taxonbar, from=Q10937017 mithridatis Fish of the Southern Ocean Fauna of the Kerguelen Islands Fish described in 2008