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Generic Harvest Control Rules for European Fisheries. Rainer Froese, Trevor A. Branch, Alexander Proelß, Martin Quaas, Keith Sainsbury & Christopher Zimmermann Accepted in Fish & Fisheries. Acronyms. B msy is the biomass that can produce the maximum sustainable yield (UNCLOS, UNFSA)

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generic harvest control rules for european fisheries

Generic Harvest Control Rules for European Fisheries

Rainer Froese, Trevor A. Branch, Alexander Proelß, Martin Quaas, Keith Sainsbury & Christopher Zimmermann

Accepted in Fish & Fisheries

acronyms
Acronyms
  • Bmsy is the biomass that can produce the maximum sustainable yield (UNCLOS, UNFSA)
  • Fmsy is the corresponding fishing mortality
  • Blim is the biomass below which recruitment is reduced and collapse possible
  • Bpa is a biomass slightly above Blim but far below Bmsy
slide3

Cod, Eastern Baltic

Bmsy

Bpa

Blim

Froese & Proelß Fish & Fisheries 2010

european fisheries are mismanaged
European Fisheries are Mismanaged
  • 24% are threatened by collapse (B < Blim)
  • 31% are near threatened (Blim > B < Bpa)
  • 45% are not threatened (B > Bpa)
  • But only 3-4 of these stocks have B > Bmsy and F < Fmsy , i.e., comply with UNCLOS and UNFSA
  • ICES since 2010 gives estimates of Fmsy but not MSY or Bmsy
  • Less than half of the stocks are assessed
hcr 1 reference and trigger biomass
HCR 1: Reference and Trigger Biomass

The reference biomass Bmsy for the subsequent rules and reference points is the biomass that can produce the maximum sustainable yield.

This biomass also acts as a trigger when stocks fall below this level.

hcr 2 target biomass
HCR 2: Target Biomass

The target biomass, to be achieved on average over approximately 5 years,

is 1.3 Bmsy.

The target biomass can be increased as required by economic, ecosystem or other considerations.

hcr 3 limit biomass
HCR 3: Limit Biomass

The limit biomass Blim, which is to be avoided with a high probability, is 0.5 Bmsy

A higher biomass limit may be set for species with low resilience to exploitation.

hcr 4 total allowable catch
HCR 4: Total Allowable Catch

Fisheries are managed by a total allowable catch (TAC).

A maximum TAC is set for each stock so that the respective target biomass is maintained on average.

This maximum TAC may be taken as long as biomass fluctuations remain above Bmsy.

hcr 5 tac reductions
HCR 5: TAC Reductions

If the biomass falls below Bmsy, then the TAC is linearly reduced, as a function of biomass, to reach zero catch at Blim.

hcr 6 mixed fisheries
HCR 6: Mixed Fisheries

In fisheries where several target species are caught with the same gear, the maximum TACs for the respective stocks will be set such that the most sensitive stocks do not fall below Bmsy on average over five years, with a high probability of not falling below Blim.

hcr 7 discard
HCR 7: Discard

No discard of commercially exploited species will be allowed, except for species with a demonstrated high discard survival rate.

hcr 8 bycatch
HCR 8: Bycatch

Ecological risk assessment will be conducted on bycatch species and to assess potential damage to the environment caused by fishing, with respective measures to be taken to minimize risk.

hcr 9 size structure
HCR 9: Size structure

The mean size and age in the catch will be adjusted to minimize changes in age structure caused by fishing, and to reduce the effects of fisheries-induced unnatural selection.

status of european stocks1
Status of European Stocks

Move stocks here.

Landings may then

be 60% higher

Froese et al., accepted in FAF

slide24

Cod, Eastern Baltic

BMSY

MSY

Froese & Proelß Fish & Fisheries 2010

thank you

Thank You

Rainer Froese

IFM-GEOMAR

[email protected]

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