hake/nephrops mixed fisheries in the Bay of Biscay PARAMETRIZATION

hake/nephrops mixed fisheries in the Bay of Biscay Hake Northern Stock Nephrops Stock on VIIIa,b French fleets: 8 fleets (i.e. 1 harbor x 2 vessel types x 4 strategy) Spanish fleets :6 fleets (i.e. [1 harbor x 2 vessel types + 1 harbor x 1 vessel type] x 2 strategy) What about Ireland and UK… (celtic sea)

fleet parametrization fleet totalnbvesselspropSOVnbvesselshoursatseaharborcellharbornamespeed BenthicIntermediate NA24E6-guilvinec17.2 BenthicLarge NA24E6-guilvinec18.5 HakeIntermediate NA24E6-guilvinec17.2 HakeLarge NA24E6-guilvinec18.5 NephropsIntermediate NA24E6-guilvinec17.2 NephropsLarge NA24E6-guilvinec18.5 HakeNetIntermediate28128NA24E6-guilvinec17.2 HakeNetLarge20120NA24E6-guilvinec18.5 SpainMainHakeON NA15E6-ondarroa17.2 SpainMainHakeON NA15E6-ondarroa17.2 SpainMainHakePA NA15E7-pasaia17.2 SpainMainMegrimAnglerfishON NA15E6-ondarroa17.2 SpainMainMegrimAnglerfishON NA15E6-ondarroa17.2 SpainMainMegrimAnglerfishPA NA15E7-pasaia17.2 fleet tripduration nbfishopeperday nbgearsperope minnbinactdays BenthicIntermediate1510 BenthicLarge5512 HakeIntermediate1510 HakeLarge5512 NephropsIntermediate1510 NephropsLarge5512 HakeNetIntermediate1510 HakeNetLarge5512 SpainMainHakeON SpainMainHakeON SpainMainHakePA SpainMainMegrimAnglerfishON SpainMainMegrimAnglerfishON SpainMainMegrimAnglerfishPA explicit effort calculation implicit effort calculation ‘Non Attributed’ in Isis mode

Possible metiers for a given fleet fleet & metier parametrization metiertargetgearfleets market targetfactornephrops targetfactorhakezonejan met1hakeOTBLNBenthicIntermediate french E4 24E5 24E6 etc. met2hakeTTBLNBenthicIntermediate french E4 24E5 24E6 etc. met3nephropsOTBLNBenthicIntermediate french E5 24E6 23E5 etc. met4nephropsTTBLNBenthicIntermediate french E5 24E6 23E5 etc. met5hakeOTBLNBenthicIntermediate french E4 24E5 24E6 etc. met6hakeTTBLNBenthicIntermediate french E4 24E5 24E6 etc. met7hakeOTBLNBenthicLarge french E4 24E5 24E6 etc. met8hakeTTBLNBenthicLarge french E4 24E5 24E6 etc. met9nephropsOTBLNBenthicLarge french E5 24E6 23E5 etc. met10nephropsTTBLNBenthicLarge french E5 24E6 23E5 etc. met11hakeOTBLNBenthicLarge french E4 24E5 24E6 etc. met12hakeTTBLNBenthicLarge french E4 24E5 24E6 etc. met25hakeGNSHakeNetIntermediate french E7 24E5 24E6 etc. met26hakeGNSHakeNetLarge french E7 24E5 24E6 etc. met39hakeBAKAnetsSpainMainHakeON2029spain E2 24E3 24E4 etc. met40hakeVHVOnetsSpainMainHakeON2029spain E2 24E3 24E4 etc. met41hakeBAKAnetsSpainMainHakeON3039spain E2 24E3 24E4 etc. met42hakeVHVOnetsSpainMainHakeON3039spain E2 24E3 24E4 etc. met43hakeBAKAnetsSpainMainHakePA3039spain E2 24E3 24E4 etc. met44hakeVHVOnetsSpainMainHakePA3039spain E2 24E3 24E4 etc. met45hakeBAKAnetsSpainMainMegrimAnglerfishON2029spain E2 24E3 etc. met46hakeVHVOnetsSpainMainMegrimAnglerfishON2029spain E2 24E3 etc. met47hakeBAKAnetsSpainMainMegrimAnglerfishON3039spain E2 24E3 etc. met48hakeVHVOnetsSpainMainMegrimAnglerfishON3039spain E2 24E3 etc. met49hakeBAKAnetsSpainMainMegrimAnglerfishPA3039spain E2 24E3 etc. met50hakeVHVOnetsSpainMainMegrimAnglerfishPA3039spain E2 24E3 etc. A metier as target, gear, zone FLMetier FLSetOfVessels To be redefined (dilution de l’effort à cause de rect qui peuvent n’être visité que peu de fois Par rapport à d’autres…) Dans isis pose problème de ponderer L’effort sur la zone metier en fonction du nb de marée Veant de l’analyse des données car par à l’echelle cellule (dans isis FLR ce serait possible…)

Gear parametrization (linked with metier) geardescstrdfactortechnparam equselectnephropsequselecthake BAKAnetsspain gear7.580…… VHVOnetsspain gear6100…… OTBLNsingle bottom trawl1.070…… TTBLNtwin bottom trawl1.3970…… GNSnets …… FPOLNcasier …… ? 5 FLGear

Gear parametrization (linked with metier) NameParameterRange of parameter valueStandard factorSelectivity function Trawlmesh size Hake: SF=4.32, SR=0.325 Nephrops: SF=0.5, SR=0.43 Twin trawlmesh size Gillnetnet length Hake: 1 if 64.4  L  70.3 else  =6.442,  =0.707 if (L<64.4) : A=0.985,  =0.015 if (L >70.3) : A=0.65,  =0.538 Nephrops: 0 BAKA Trawlmesh sizeCs=4.8 VHVO trawlMesh sizeCs=3.71

Discards parametrization (linked with metier) FLdiscards Not metier-specific…

stock parametrization stock by cells by season using FLQuant objects 2 x FLBiol Redefined with an equation with ‘fits and starts’?? For which year of reference?

stock parametrization Hake Catchabilities from logbooks (Drouineau et al.) FLCatch (hake) q for nephrops: 3.739e -5 (MAGALI) Catchabilities from calibration using sum(observed landings-isis landings)^2

stock parametrization Bio.zone repro.zone recru.zone inshore.zone migration coefficients by season between zones (what about emigration/immigration from (to) Bay of Biscay?) Bio.zone repro.zone recru.zone inshore.zone

economic parametrization missing FLMarket A market category Values from DEM to be revised

economic parametrization at fleet level missing FLCostFleet

Economic parametrization FLCostMetier Missing cf. AZTI document: Difference in units?? => No metier-specific!!!

MANAGEMENT SCENARIOS hake/nephrops mixed fisheries in the Bay of Biscay

increase gear selectivity by changing the mesh size (70, 90, 110 mm for TTBLN & OTBLN gears used by trawlers) 1st management scenario tested: 70mm110mm

hake/nephrops mixed fisheries in the Bay of Biscay MPA creation from EFIMAS proposal: 23E4 22E4 22E5 : repro, recru 23E5 20E7 19E7 : recru total closure for trawlers and VHVO from February to May 2nd management scenario tested: In combination with a TAC?? Error: in the current results MPA have been applied on all metiers… On which assumption this MPA have been suggested? To protect the juvenile? To protect the spawning biomass?

hake/nephrops mixed fisheries in the Bay of Biscay RESULTS

hake/nephrops mixed fisheries in the Bay of Biscay Abundance trajectories No Exploitation=

hake/nephrops mixed fisheries in the Bay of Biscay No Exploitation= hake, ages 3-4 hake, ages 1-2 hake, ages Abundance and migration with no exploitation

hake/nephrops mixed fisheries in the Bay of Biscay Starting point with implemented fleets (french and spanish fleets) Abundance trajectories No scenario =

hake/nephrops mixed fisheries in the Bay of Biscay Starting point with implemented fleets (french and spanish fleets) Abundance trajectories per age Stock-recruitment relationship to be revised? No scenario =

hake/nephrops mixed fisheries in the Bay of Biscay Starting point with implemented fleets (french and spanish fleets) catches trajectories No scenario = Problme des landings trop faible pour les netters (provient de l’hypothèse de la repartition uniforme de l’effort sur les zones metier=>dilution de l’effort)