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hake/nephrops mixed fisheries in the Bay of Biscay

Analysis of fleet parametrization and effort calculation for hake and nephrops mixed fisheries in the Bay of Biscay. Includes information on fleet composition, gear usage, and target species.

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hake/nephrops mixed fisheries in the Bay of Biscay

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  1. PARAMETRIZATION hake/nephrops mixed fisheries in the Bay of Biscay

  2. 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)

  3. fleet parametrization fleet totalnbvessels propSOV nbvessels hoursatsea harborcell harborname speed BenthicIntermediate 123 0.382 46.986 NA 24E6- guilvinec 17.2 BenthicLarge 83 0.67 55.61 NA 24E6- guilvinec 18.5 HakeIntermediate 123 0.178 21.894 NA 24E6- guilvinec 17.2 HakeLarge 83 0.16 13.28 NA 24E6- guilvinec 18.5 NephropsIntermediate 123 0.4 49.2 NA 24E6- guilvinec 17.2 NephropsLarge 83 0.17 14.11 NA 24E6- guilvinec 18.5 HakeNetIntermediate 28 1 28 NA 24E6- guilvinec 17.2 HakeNetLarge 20 1 20 NA 24E6- guilvinec 18.5 SpainMainHakeON2029 15 0.27 4.05 NA 15E6- ondarroa 17.2 SpainMainHakeON3039 36 0.33 11.88 NA 15E6- ondarroa 17.2 SpainMainHakePA3039 18 0.89 16.02 NA 15E7- pasaia 17.2 SpainMainMegrimAnglerfishON2029 15 0.73 10.95 NA 15E6- ondarroa 17.2 SpainMainMegrimAnglerfishON3039 36 0.66 23.76 NA 15E6- ondarroa 17.2 SpainMainMegrimAnglerfishPA3039 18 0.11 1.98 NA 15E7- pasaia 17.2 implicit effort calculation fleet tripduration nbfishopeperday nbgearsperope minnbinactdays BenthicIntermediate 1 5 1 0 BenthicLarge 5 5 1 2 HakeIntermediate 1 5 1 0 HakeLarge 5 5 1 2 NephropsIntermediate 1 5 1 0 NephropsLarge 5 5 1 2 HakeNetIntermediate 1 5 1 0 HakeNetLarge 5 5 1 2 SpainMainHakeON2029 5 5 1 2 SpainMainHakeON3039 5 5 1 2 SpainMainHakePA3039 5 5 1 2 SpainMainMegrimAnglerfishON2029 5 5 1 2 SpainMainMegrimAnglerfishON3039 5 5 1 2 SpainMainMegrimAnglerfishPA3039 5 5 1 2 ‘Non Attributed’ in Isis mode explicit effort calculation

  4. fleet & metier parametrization metier target gear fleets market targetfactornephrops targetfactorhake zonejan met1 hake OTBLN BenthicIntermediate french 0.07 0.09 24E4 24E5 24E6 etc. met2 hake TTBLN BenthicIntermediate french 0.07 0.09 24E4 24E5 24E6 etc. met3 nephrops OTBLN BenthicIntermediate french 0.74 0.14 24E5 24E6 23E5 etc. met4 nephrops TTBLN BenthicIntermediate french 0.74 0.14 24E5 24E6 23E5 etc. met5 hake OTBLN BenthicIntermediate french 0.0 0.60 24E4 24E5 24E6 etc. met6 hake TTBLN BenthicIntermediate french 0.0 0.60 24E4 24E5 24E6 etc. met7 hake OTBLN BenthicLarge french 0.07 0.09 24E4 24E5 24E6 etc. met8 hake TTBLN BenthicLarge french 0.07 0.09 24E4 24E5 24E6 etc. met9 nephrops OTBLN BenthicLarge french 0.74 0.14 24E5 24E6 23E5 etc. met10 nephrops TTBLN BenthicLarge french 0.74 0.14 24E5 24E6 23E5 etc. met11 hake OTBLN BenthicLarge french 0.0 0.60 24E4 24E5 24E6 etc. met12 hake TTBLN BenthicLarge french 0.0 0.60 24E4 24E5 24E6 etc. met25 hake GNS HakeNetIntermediate french 0.0 0.87 23E7 24E5 24E6 etc. met26 hake GNS HakeNetLarge french 0.0 0.87 23E7 24E5 24E6 etc. met39 hake BAKAnets SpainMainHakeON2029 spain 0.0 0.13 24E2 24E3 24E4 etc. met40 hake VHVOnets SpainMainHakeON2029 spain 0.0 0.76 24E2 24E3 24E4 etc. met41 hake BAKAnets SpainMainHakeON3039 spain 0.0 0.13 24E2 24E3 24E4 etc. met42 hake VHVOnets SpainMainHakeON3039 spain 0.0 0.76 24E2 24E3 24E4 etc. met43 hake BAKAnets SpainMainHakePA3039 spain 0.0 0.13 24E2 24E3 24E4 etc. met44 hake VHVOnets SpainMainHakePA3039 spain 0.0 0.76 24E2 24E3 24E4 etc. met45 hake BAKAnets SpainMainMegrimAnglerfishON2029 spain 0.0 0.13 24E2 24E3 etc. met46 hake VHVOnets SpainMainMegrimAnglerfishON2029 spain 0.0 0.76 24E2 24E3 etc. met47 hake BAKAnets SpainMainMegrimAnglerfishON3039 spain 0.0 0.13 24E2 24E3 etc. met48 hake VHVOnets SpainMainMegrimAnglerfishON3039 spain 0.0 0.76 24E2 24E3 etc. met49 hake BAKAnets SpainMainMegrimAnglerfishPA3039 spain 0.0 0.13 24E2 24E3 etc. met50 hake VHVOnets SpainMainMegrimAnglerfishPA3039 spain 0.0 0.76 24E2 24E3 etc. 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…) FLSetOfVessels FLMetier FLMetier Possible metiers for a given fleet A metier as target, gear, zone

  5. Gear parametrization (linked with metier) gear desc strdfactor technparam equselectnephrops equselecthake BAKAnets spain gear 7.5 80 … … VHVOnets spain gear 6 100 … … OTBLN single bottom trawl 1.0 70 … … TTBLN twin bottom trawl 1.39 70 … … GNS nets 0.37 10000 … … FPOLN casier 0.38 10001 … … ? 5 FLGear

  6. Name Parameter • Range of parameter value • Standard factor • Selectivity function • Trawl • BAKA Trawl • mesh size • mesh size • 70-100 • 1 • Hake: SF=4.32, SR=0.325 Nephrops: SF=0.5, SR=0.43 • Cs=4.8 • Twin trawl • mesh size • 70-100 • 1.39 • Gillnet • VHVO trawl • net length • Mesh size • 10000 • 0.37 • 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 Cs=3.71 Gear parametrization (linked with metier)

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

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

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

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

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

  12. economic parametrization at fleet level FLCostFleet missing

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

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

  15. hake/nephrops mixed fisheries in the Bay of Biscay 1st management scenario tested: • increase gear selectivity by changing the mesh size (70, 90, 110 mm for TTBLN & OTBLN gears used by trawlers) 70mm 110mm

  16. hake/nephrops mixed fisheries in the Bay of Biscay 2nd management scenario tested: • MPA creation from EFIMAS proposal: 23E4 22E4 22E5 : repro, recru 23E5 20E7 19E7 : recru total closure for trawlers and VHVO from February to May 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? In combination with a TAC??

  17. RESULTS hake/nephrops mixed fisheries in the Bay of Biscay

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

  19. hake/nephrops mixed fisheries in the Bay of Biscay hake, ages 1-2 Abundance and migration with no exploitation hake, ages 3-4 No Exploitation= hake, ages 4-9 +

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

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

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

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