Scottish Marine and Freshwater Science Vol 7 No 9
This report presents summaries of historic and recent landings data and the results of stock assessments for brown crab, velvet crab and lobster, based on data collected between 2009 and 2012. A description of the biology, habitat and life history of these species is provided in Mill et al., 2009.
Data and Resources
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2009-01-01 to 2012-12-31
UK Open Government Licence (OGL)
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Length frequency data obtained from market sampling and official landings data were combined to provide a raised annual landings-at-length distribution. Data were averaged over a number of years (2009-2012) and aggregated into 5 mm length classes for brown crab and lobster and 3 mm length classes for velvet crab for use in the LCA. Landings-at-length data were not available for the three species in all assessment areas. The decision-making process to select which areas had sufficient data to run stock assessments is presented in Annex A. Four parameters were defined to categorise the quality of the sampling data: number of trips/animals sampled; number of years for which data is available (maximum 4 years – 2009-2012); sampling seasonality; Length frequency distribution (LFD) shape. For each species/area, these parameters were classified in three categories (“poor”/”ok”/”good”). Stock assessments were not run for areas where one or more of the parameters was classified as “poor”.
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Marine Scotland Science
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