Case Study 1c.
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Case Study 1c. Directed single-species fishery – less vulnerable – southern blue ling ( Molva dypterygia ) in Vb,VI, VII & XIIb. Blue ling. Age up to 30yrs Age of maturity 6-7 yrs Spawns in N. Atlantic in April/May High fecundity - millions of eggs. Blue ling.

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Blue ling

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Blue ling

Case Study 1c. Directed single-species fishery – less vulnerable – southern blue ling (Molva dypterygia) in Vb,VI, VII & XIIb.


Blue ling

Blue ling

Age up to 30yrs

Age of maturity 6-7 yrs

Spawns in N. Atlantic in April/May

High fecundity - millions of eggs.


Blue ling

Blue ling

Found between 400-1200m, most common at around 1200m.

Spawning aggregations targeted by fisheries


Blue ling

Cumulative historical landings circa 500,000 t

Historically mainly a French trawl fishery with catches from a wide range of countries, but now mainly France, Faroes and UK(Scotland)


Assessments advice

Assessments & advice

  • Latest ICES advice (2008) based on time-series LPUE data from French reference fleet


Assessments and advice

Assessments and advice

  • “There should be no directed fisheries for blue ling in Subdivisions Vb, VI, and VII and measures should beimplemented to minimize bycatches in mixed fisheries. Blue ling is susceptible to sequential depletion of spawning aggregations and closed areas to protect spawning aggregations should therefore be maintained and expanded where appropriate.”

  • Exploratory assessments using stock reduction and CSA


Deliverables

Deliverables

  • Review of development of fishery, catches and fleets

  • Review of LHCs, stock structure and status

  • Review of assessment methods used thus far

  • Inventory of fisheries, biological, biodiversity,VME and socio-economic data.

  • Impacts of fishery on biodiversity

  • SWOT analysis of current historical management & monitoring procedures


Development of fishery catches and fleets

Development of fishery, catches and fleets

  • Spatial pattern in catches – at higher resolution.

  • French & Irish VMS and observer data

  • UK data already available


Lhcs stock structure status

LHCs, stock structure & status

  • LHCs and status straightforward

  • Stock structure – review current work


Assessment methods used thus far

Assessment methods usedthus far

  • Full description of methods

  • Literature search focusing on use of stock reduction models for orange roughy stocks off NZ and past applications of CSA


Inventory of fisheries biological biodiversity vme and socio economic data

Inventory of fisheries, biological, biodiversity,VME and socio-economic data.

  • Fisheries data – focus on developing final iteration of French abundance indices.

  • How we incorporate haul by haul data available from Industry

  • Biological, biodiverisity and VME data – observer reports?

  • Socio-economic data – considerable challenge

  • Approach UK and French Fishing Companies/POs

  • May have to focus on data available in public domain

  • DCR?


Impacts of fishery on biodiversity

Impacts of fishery on biodiversity

  • Evaluate potential effects based on composition of commercial catches inc discards

  • Focus on continental slope off NW Scotland – generic study.


Swot analysis of current historical management monitoring

SWOT analysis of current historical management & monitoring

  • EU Sampling plans and observer data

  • Stock identity

  • Ageing

  • Nursery areas and recruitment processes

  • Monitoring effects of protection areas on abundance indices and F (POORFISH studies)

  • HCRs and BRPs

  • Length-based assessment methods

  • Life history models – Gulland, Beddington and Cook, Kirkwood models - estimate of B0


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