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. 2016 Aug;89(2):1473-81.
doi: 10.1111/jfb.13041. Epub 2016 Jun 28.

Seamount egg-laying grounds of the deep-water skate Bathyraja richardsoni

L-A Henry  1 , M F W Stehmann  2 , L De Clippele  1 , H S Findlay  3 , N Golding  4 , J M Roberts  1   5
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Seamount egg-laying grounds of the deep-water skate Bathyraja richardsoni

L-A Henry et al. J Fish Biol.2016 Aug.

Abstract

Highly localized concentrations of elasmobranch egg capsules of the deep-water skate Bathyraja richardsoni were discovered during the first remotely operated vehicle (ROV) survey of the Hebrides Terrace Seamount in the Rockall Trough, north-east Atlantic Ocean. Conductivity-temperature-depth profiling indicated that the eggs were bathed in a specific environmental niche of well-oxygenated waters between 4·20 and 4·55° C, and salinity 34·95-35·06, on a coarse to fine-grained sandy seabed on the seamount's eastern flank, whereas a second type of egg capsule (possibly belonging to the skate Dipturus sp.) was recorded exclusively amongst the reef-building stony coral Solenosmilia variabilis. The depths of both egg-laying habitats (1489-1580 m) provide a de facto refuge from fisheries mortality for younger life stages of these skates.

Keywords: deep sea; elasmobranch; environment; habitat; reproduction.

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