ICES contributions MSFD CIS WGGES

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Presentation transcript:

ICES contributions MSFD CIS WGGES D3.3 and D6/D1 habitats Mark Dickey-Collas & Sebastian Valanko @ICES_ASC

Workshop on D3.3 1-4 Nov 2016 Request Explore data requirements to assess size distribution of a stock Explore potential size-based indicators (SBI) that are not redundant to D3C1 and D3C2 Explore methods to describe the trend over time in SBI Explore the setting of thresholds and reference levels for any potential methods SBI- Size based indicators

Sized based indicators explored L95 : 95thpercentile of the length-frequency distribution in survey catches (for some stocks may be also obtained from commercial data) Cpuemega or SSBmega : abundance of mega spawners, either from survey data or from stock assessment data Pmega : proportion of mega spawners Pmat : proportion of mature individuals Megaspawner – spawners greater than length of optimum yield

Preliminary conclusions (1) Data source will impact perception of SBI – survey, catch, stock assessment Must use methods that reduce sensitivity to recruitment (young fish) Challenge to determine reference points Not a challenge to determine trends and limits based on past, prefer reference points based on conceptual understanding

Preliminary conclusions (2) SBI using absolute values are generally redundant to D3C2 Relationships between proportional SBI and D3C1 & D3C2 less clear Simulations can test likely scenarios Fished at D3C1 Fmsy North Sea plaice

D6/D1 request Evaluate indicators for assessing pressure, impact and recovery on the seafloor from bottom-contacting fishing. Using this assessment, demonstrate trade-offs in catch/value of landings relative to impacts.

Working with partners Using worked examples from regions/subregions

Process – 3 workshops leading to advice WKBENTH (28 Feb – 3 March 2017) WK to evaluate regional benthic pressure and impact indictor(s) from bottom fishing WKSTAKE (24 March 2017) WK on scoping stakeholders on production of operational guidance on regional management & assessment of benthic pressure & impact from bottom fishing WKTRADE (28-31 March 2017) WK to evaluate trade-offs between the proportion of impact on seafloor habitats & provisions of catch/value Advice drafting (22-24 May 2017) released 6 June 2017 Community, fishing, longevity, impact, conservation Baltic Boost - total fishing impact map from mobile-bottom contacting gears