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Concept
Dipturus batis
Résumé
The common skate (Dipturus batis), also known as the blue skate, is the largest skate in the world, attaining a length of up to . Historically, it was one of the most abundant skates in the northeast Atlantic Ocean and the Mediterranean Sea. Despite its name, today it appears to be absent from much of this range. Where previously abundant, fisheries directly targeted this skate and elsewhere it is caught incidentally as bycatch. The species was uplisted to critically endangered on the IUCN Red List in 2006 and it is protected within the EU.
Research published in 2009 and 2010 showed that the species should be split into two, the smaller southern D. cf. flossada (blue skate), and the larger northern D. cf. intermedius (flapper skate). Under this taxonomic arrangement, the name D. batis is discarded. Alternatively, the scientific name D. batis (with flossada as a synonym) is retained for the blue skate and D. intermedius for the flapper skate.
The common skate can reach up to in length, in width, and in weight, making it the largest skate in the world. Overall shape features a pointed snout and rhombic shape, with a row of spines or thorns along the tail. The top surface is generally coloured olive-grey to brown, often with a pattern of spots, and the underside is lighter blue-grey. It can be confused with several other skates in its range, such as D. nidarosiensis, D. oxyrinchus, and Rostroraja alba.
The common skate is native to the northeast Atlantic. It is a bottom dwelling species mainly found at depths of 100-200m, but it can occur as shallow as 30m and as deep as 1000m. Now, their population and range are severely depleted and fragmented, with disappearances being reported on several places. This species is found in northeastern Atlantic from Norway and Iceland to Senegal. Its presence in the Mediterranean Sea is questionable since earlier records could concern D. intermedius recently considered as a distinct species.
The common skate can reach an estimated age of 50–100 years and maturity is reached when about 11 years old.
Source officielle
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