11755855Edited by MartynC.100016772layer_information_pageund1548938185156051034500156051034555<p>Data from a scientific deep-water trawl fisheries survey in the north-east Atlantic were analysed to determine the spatial and bathymetric distribution of elasmobranch species and assess the change in relative abundance over the period 1998–2013. MS Maps NMPi shows the results of the 11 more common species as 11 maps:</p> <ol> <li>Black dogfish</li> <li>Blackmouth dogfish</li> <li>Greatern lantern shark</li> <li>Leafscale gulper shark</li> <li>Longnose velvet dogfish</li> <li>Mouse catshark</li> <li>Pale catshark</li> <li>Portuguese dogfish</li> <li>Shovelnosed shark</li> <li>Smalleye catfish</li> <li>Velvet belly shark</li> </ol> filtered_html<p>Data from a scientific deep-water trawl fisheries survey in the north-east Atlantic were analysed to determine the spatial and bathymetric distribution of elasmobranch species and assess the change in relative abundance over the period 1998–2013. MS Maps NMPi shows the results of the 11 more common species as 11 maps:</p> <ol> <li>Black dogfish</li> <li>Blackmouth dogfish</li> <li>Greatern lantern shark</li> <li>Leafscale gulper shark</li> <li>Longnose velvet dogfish</li> <li>Mouse catshark</li> <li>Pale catshark</li> <li>Portuguese dogfish</li> <li>Shovelnosed shark</li> <li>Smalleye catfish</li> <li>Velvet belly shark</li> </ol> 349454355range_of_deep_water_trawl_survey_data.pngpublic://range_of_deep_water_trawl_survey_data.pngimage/png22226911560510314imageRange of Deep Water Trawl Survey data © Marine ScotlandRange of Deep Water Trawl Survey data © Marine ScotlandRange of Deep Water Trawl Survey data © Marine ScotlandRange of Deep Water Trawl Survey data © Marine Scotland<_drafty_revision_requested>FIELD_LOAD_CURRENTRange of Deep Water Trawl Survey data © Marine Scotland539786539786816<p>During the period of the surveys, commercial fisheries for deep-water sharks went from being entirely unregulated, to being briefly managed, to being completely prohibited. A total of 22 species of shark and 10 species of skate were recorded between depths of 300 and 2030 m. All showed strong species-specific depth-related trends in abundance. Out of the 11 more common species, five showed no change in relative abundance over time, two (<em>Centrophorus</em> <em>squamosus</em> and <em>Centroselachus</em> <em>crepidater</em>) declined significantly and four increased in relative abundance (<em>Apristurus</em> <em>aphyodes</em>, <em>Apristurus microps</em>, <em>Galeus melastomus</em> and <em>Deania calcea</em>).</p> <p>Assuming these populations were depleted by fisheries in the past, the current data do not suggest there has been an overall recovery. Positive signs for some species in the most recent years suggest movement or recruitment back into the area; however, it is of concern that two species continued to decline.</p> filtered_html<p>During the period of the surveys, commercial fisheries for deep-water sharks went from being entirely unregulated, to being briefly managed, to being completely prohibited. A total of 22 species of shark and 10 species of skate were recorded between depths of 300 and 2030 m. All showed strong species-specific depth-related trends in abundance. Out of the 11 more common species, five showed no change in relative abundance over time, two (<em>Centrophorus</em> <em>squamosus</em> and <em>Centroselachus</em> <em>crepidater</em>) declined significantly and four increased in relative abundance (<em>Apristurus</em> <em>aphyodes</em>, <em>Apristurus microps</em>, <em>Galeus melastomus</em> and <em>Deania calcea</em>).</p> <p>Assuming these populations were depleted by fisheries in the past, the current data do not suggest there has been an overall recovery. Positive signs for some species in the most recent years suggest movement or recruitment back into the area; however, it is of concern that two species continued to decline.</p> 17785177861778717788177891779017791177921779317794177951677016771758sioc:Itemfoaf:Documentdc:datedc:createdxsd:dateTimedate_iso8601dc:modifiedxsd:dateTimedate_iso8601content:encodedsioc:has_creatorrelfoaf:namesioc:num_repliesxsd:integersioc:last_activity_datexsd:dateTimedate_iso8601https://marine.gov.scot/?q=information/deep-water-trawl-survey-distribution-and-abundance-11-more-common-deep-water-sharks-andMartynC0a:6:{s:7:"overlay";i:1;s:16:"ckeditor_default";s:1:"t";s:20:"ckeditor_show_toggle";s:1:"t";s:14:"ckeditor_width";s:4:"100%";s:13:"ckeditor_lang";s:2:"en";s:18:"ckeditor_auto_lang";s:1:"t";}10869211755816772publishedpublished55156051034511156051034510869211755816772publishedpublished55156051034511156051034510869211755816772publishedpublished551560510345111560510345