Japanese lobster

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Japanese lobster
Japanese lobster (Metanephrops japonicus)

Japanese lobster ( Metanephrops japonicus )

Systematics
Order : Decapods (decapoda)
Subordination : Pleocyemata
Partial order : Large crayfish (Astacidea)
Family : Lobster-like (Nephropidae)
Genre : Metanephrops
Type : Japanese lobster
Scientific name
Metanephrops japonicus
( Tapparone-Canefri , 1873)

The Japanese lobster ( Metanephrops japonicus ) is a species of decipod crustaceans from the lobster-like family (Nephropidae). It is native to the Pacific coast of Japan and is part of the Japanese cuisine as a seafood .

features

Japanese lobsters reach body lengths of 9 to 12 cm, with the length of the carapace ranging from 3 to 7 cm. A body length of up to 20 cm seems to be possible. Its color is entirely orange-red. Albinism has been observed. The two pairs of antennas are clearly red, the tips of the scissors and ridges on the striding legs are white.

The pointed rostrum protrudes far beyond the eyes and the bases of the antennas (antennal peduncle) and has up to six asymmetrical, pointed teeth. The carapace has a prominent spine (upper hepatic spine) on its flanks. The scissors of the first pair of striding legs are usually unequal. They have an elongated, slender shape and are densely toothed with large spines.

Characteristic features of the Japanese lobsters are the rear noticeable ridges of the abdomen and an arched horn (supraorbital horn) on the rostrum. In general, the structuring of the carapace and abdomen is very pronounced compared to other species of the genus. The Japanese lobster is easy to confuse with Metanephrops sagamiensis .

The eggs are greenish-blue in color and turn white when they hatch. Japanese lobsters hatch as Prezoea larvae and have a carapace length of about 3 mm and a total body length of 9 mm. Carapace, rostrum and abdomen are smooth and the characteristic thorns or ridges are still missing. All exopodites of the striding legs lack the setae . A zoea larval stage is missing; after moulting , Japanese lobsters can already be considered post-larva or megalopa.

A molting process takes 23 minutes under laboratory conditions, with the increase in length of the carapace being 12.8%.

Dissemination and use

Japanese lobsters are endemic to the Pacific coast of Japan . The distribution area extends from Chōshi to the island of Kyūshū , with the species living in depths of the sea from 200 m to 440 m. It is part of the benthos and mainly found on the muddy seabed.

The Japanese lobster is trawled throughout its range because it is valued as a delicacy . Despite this use and a regional decline in catch yields, there is no known risk due to a lack of data. Aquacultures are not used, the breeding of larvae and their release is the subject of research.

Taxonomy

First described the Japanese Hummer was Cesare Maria Tapparone-Canefri in 1873 as Nephrops japonicus . The Japanese lobster is a type species of the genus Metanephrops .

swell

  • Lipke B. Holthuis: Marine Lobsters of the World . An Annotated and Illustrated Catalog of Species of Interest to Fisheries Known to Date. Ed .: Food and Agriculture Organization (=  FAO Fisheries Synopsis . Volume 125 ). Rome 1991, ISBN 978-92-5103027-1 .
  • T.-Y. Chan, H.-P. Yu: Studies on the Metanephrops japonicus group (Decapoda, Nephropidae), with descriptions of two new species . In: Crustaceana . tape 60 , 1991, pp. 18–51 ( nhm.org [PDF; 43.0 MB ; accessed on May 9, 2012]).
  • CM Tapparone-Canefri: Intorno ad una nuova specie di Nephrops genere di Crostacei Decapodi Macruri . In: Memorie R. Accademia Scienze Torino . tape (2) 27 , 1873, pp. 325-329 .

Individual evidence

  1. ↑ a b c Kazutoshi Okamoto: Japanese nephropid lobster Metanephrops japonicus lacks zoeal stage . In: Fisheries Science . tape 74 , 2008, p. 98-103 , doi : 10.1111 / j.1444-2906.2007.01500.x .
  2. ↑ Kazutoshi Okamoto: Albino Japanese lobster Metanephrops japonicus obtained from Suruga Bay . In: Bulletin of Shizuoka Prefectural Research Institute of Fishery . tape 44 , 2009, p. 39-40 .
  3. ↑ Kazutoshi Okamoto: Molting behavior of Japanese Lobster, Metanephrops japonicus in Captivity . In: Bulletin of the Shizuoka Prefectural Fisheries Experiment Station . tape 41 , 2006, p. 55-57 .
  4. ↑ metanephrops japonicus in the endangered Red List species the IUCN 2011. Posted by: M. Butler, TY Chan, A. Cockcroft, A. MacDiarmid, R. Wahle, 2011. Accessed on May 9, 2012 Design.
  5. ↑ T. Chan: Metanephrops. In: World Register of Marine Species. Retrieved May 9, 2012 .

Web links

Commons : Japanese Lobster  - Collection of Images