Deep redfish

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Deep redfish
Sebastes mentella on a Faroe Islands postage stamp.

Sebastes mentella on a Faroe Islands postage stamp .

Systematics
Perch relatives (Percomorphaceae)
Order : Perch-like (Perciformes)
Subordination : Scorpionfish relatives (Scorpaenoidei)
Family : Spiny Heads (Sebastidae)
Genre : Sebastes
Type : Deep redfish
Scientific name
Sebastes mentella
Travin , 1951

The deep snapper ( Sebastes mentella ) is the area known as edible fish redfish ( Sebastes norvegicus ) very similar marine fish.

It occurs in the Northern European Sea , around Iceland , on the south coast of Greenland , in the southern Davis Strait , in the Labrador Sea , around Newfoundland and on the coast of Nova Scotia . With an occurrence in the Norwegian Channel , it also reaches the northern North Sea .

features

The deep redfish grows to a maximum of 58 centimeters, but usually stays at a length of 40 centimeters. He will be 65 to 75 years old. It differs from the redfish mainly in the strong bone hook at the tip ( symphysis ) of the lower jaw. Its color is bright brick red. Its dorsal fin is supported by 14 to 16 spines and 13 to 17, mostly 14 to 15 soft rays. In the anal fin there are three spines and 7 to 11, usually 8 to 9 soft rays. The pectoral fins count 18 to 20 fin rays . In the lateral line row (SL) there are 32 to 40 scales, mostly 43. The number of vertebrae is 30 to 32. The pre-orbital bone (bone in front of the eye socket) is covered with one to two spines. The lower edge of the eye socket is thornless. All five spines of the gill cover are roughly the same length. Additional spines are missing. The gill cover is covered with two thorns.

Way of life

The deep redfish lives as a schooling fish in a depth range of 300 to 1441 m. It prefers greater water depth and a lower temperature (0–5 ° C) than the redfish. It feeds on small fish, arrow worms , cephalopods , krill and amphipods . Like all Sebastes species, it is ovoviviparous . In the Barents Sea, mating takes place from August to September, in Iceland around mid-December. The larvae are born from April to May or June.

use

While the economic importance of the deep redfish was previously low and the annual catch was mostly below 20,000 tons, its catch quota has increased dramatically since 2000 to over 80,000 tons. Almost 100,000 tons were caught per year from 2001 to 2004. Since then, the annual catch has fallen again and in 2007 sank below 60,000 tons. The trade does not differentiate between redfish and deep redfish.

literature

  • Bent J. Muus, Jørgen G. Nielsen: The marine fish of Europe in the North Sea, Baltic Sea and Atlantic. Kosmos, Stuttgart 1999, ISBN 3-440-07804-3 .

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