orCo-Creation Rules OK

John Pope

Case Study Leader

The MAREFRAME

North Sea Case Study

The May Stake Holders Meeting

• YOU WERE MOST CONCERNED WITH

1. Need to achieve Fmsy

2. Landings Obligation

3. The Risks of Incompatible Regulations

• YOU WANT (I think)

A case study of the N.Sea Multispecies Fish System that helps clarify 1, 2 and 3

Multispecies Models For Concerns

trl

seifixbtr

ind

peloth

sth

Effort Multipliers

HADCODWHG

PLE

SOLMACNOP

SAN

HER

POK

Fishing Mortality Rates

trl

seifixbtr

ind

peloth

sth

Fleet Landings

HAD

COD

WHG

PLESOL

MACNOP

SAN

HER

POK

Spawning Stock Biomass

Status quo (1995) effort levels

Statusquo

Fpa

Bpa

Statusquo

Effort levels for maximum economic yield

trl

sei

fix

btr

ind

peloth

sth

Effort Multipliers

HADCODWHGPLE

SOLMACNOP

SAN

HER

POK

Fishing Mortality Rates

trl

sei

fix

btr

ind

peloth

sth

Fleet Landings

HADCOD

WHGPLE

SOL

MACNOP

SAN

HER

POK

Spawning Stock Biomass

Statusquo

Statusquo

Fpa

Bpa

Effect of a 50% reduction in roundfish fleet by species.

LANDINGSDISCARDSCATCHSSB

-100.00

-50.00

0.00

50.00

100.00

cod

sai

had

spr

amm

sol

Fleets

%

Species

0.5

0.5

1

1

1

1

1

RF-HC

IND-DEM

IND-PEL

HERRING

SAITHE

MACKEREL

FLATFISH

%SSB, Landings,Discards and Catch:- Change from Status Quo

Fleet Change

Fleets with max cod, haddock and whiting=Round Fish (RF)

Fleets with max sole and plaice = Flatfish (FLAT)

Size spectrum slope-6< x <-5

<-6

>-5

I Hope to use Moment Based Models

Árni M. Mathiesen, Minister of Fisheries, Iceland