(Western) ChannelCase - study

Channel Fisheries Model

cemare

Area of study: boundariesArea of study: boundaries

Summary Summary

• 4000 vessels

• 1700 registered French (6- >25m)

• 1500 registered UK (4- >25m)

• Beam, otter, pelagic, dredge, line, nets, pots

• TACs (sole, plaice, monk, cod…..)

LandingsLandingsMonkSole (VIIe)

MegrimPlaice (VIIe&d)

UK Fleet structureUK Fleet structureregion

10-15 15-24 >24M <7 7-10 10-15 15-24 >24Msouthwest 10 7 52 54 142 49 12 14east 6 3 0 46 156 13 0 0other UK 2 0 1 0 0 7 0 12

10-15 15-24 >24M 10-15 15-24 >24Msouthwest 8 2 3 24 0 4east 0 0 0 15 0 0other UK 1 0 5 2 0 0

<7 7-10 10-15 15-24 <7 7-10 10-15 15-24 totalsouthwest 350 50 27 16 134 194 32 9 1193east 297 55 4 0 114 214 22 0 945other UK 0 0 0 13 0 0 7 0 50

2138

Beam Trawl

Dredge

Net-Line

Pelagic

Pots

> 10m: 69 beamers, 75 trawl, 43 net-line, 41 potters

Model: structureModel: structure

Stocks Fleets Effort

Commercial Catch

Revenue

Fishing costs

Profit and incomes

Index a

Impact index

Recreational activity

Employment Regional economy

Recruitment, growth, natural

mortality

Index b

Recreational fishing costs

Fish prices

Recreational Catch

Non-UK fishing activity

Stocks in model (assessed)Stocks in model (assessed)Age structured Surplus Prod

• Bass 7a,f + g Edible crab

• Bass inshore 7d Lobster• Bass offshore 7e inshore Scallops • Bass inshore 7e offshore Cuttlefish

• Western Horse Mackerel • Whiting• Cod • Hake • Herring • North-east Atlantic Mackerel • Megrim • Monkfish ((1) L.bud and, (2) L. Pisc))• Plaice d • Plaice f+g • Plaice e• Sole d• Sole e

• Sole f+g 27 Age-structured / 4 SP

Stocks not assessed (used previous)Stocks not assessed (used previous)

In addition (not comprehensively assessed):

• Pilchard• Sprat• Squid• Whelk

• Lemon sole

• Brill

• Turbot

• Red gurnard and other

• Red mullet

• Flounder

• Common dab

• Pollack

• Ling

• Black bream

(Sole H-K) previous year

Many of these species to be assessed in new Working Group called WGNEW

> 10m “Importance of species” (2003 – data)> 10m “Importance of species” (2003 – data)value(%) kg(%)

scallops 13.8 12.9sole 11.7 2.5edible crab 8.7 9.1monk 7.3 4.5herring 5.1 4.7lemon sole 5.1 1.7megrim 5.0 3.2cuttle 4.6 7.8mackeral 3.8 13.7hake 3.5 1.9plaice 2.9 2.8pollack 2.9 2.3skates 2.9 3.3lobster 2.4 0.3turbot 2.1 0.4bass 1.9 0.6squid 1.8 0.9

√√

√

√

√

√

√√√

√√

√>80%

>77%<10m

√

√

√

Coverage

Technical interactions/MetiersTechnical interactions/Metiers

• Define metiers using the Fishing Activity Database (FAD)

• Trips are allocated by gear, area (species)– By value – Method: multivariate statistics – Hierarchical Agglomerative Clustering (HAC)

• Size distributions (size of vessels)

UK FleetsUK Fleets• 5 size categories

– <7, 7-10, 10-15, 15-24, >24m

• 6 main gear types– Towed gear

• Beam trawl • Trawl (otter and mid-water) • Dredge

– Pelagic– Static

• Pots, net-line

• Home ports– Southwest (Newlyn, Brixham and Plymouth)– Eastern (Poole, Hastings)– Other UK (mostly Scottish, some Welsh and other English)

Example Example effort effort allocationallocation15-24m 15-24m (southwest)(southwest)

gear metier Beam Net-Line Pelagic Pots TrawlU1-1 1% 2% 8%U1-2 1% 2%U1-3 11%U1-4 1% 17%U1-5 1% 51%U2-1 41% 1%U2-2 3%U2-3 20%U2-4 8%U2-5 19% 3%U2-6 1%

Mid U3-1Pelagic U3-2 75%

U4-1 2% 21% 3%U4-2 4%U5-1 45% 2%U5-2 1%U5-3 48% 1%U5-4U5-5U5-6 1%U5-7U6-1 3%U6-2 3% 92%U6-3 3%U6-4 5%U7-1U8-1U8-2U9.1

Line

s

southwest15-24m

Bea

m t

raw

l

Dredge

Net

sP

ots

Ott

er t

raw

l

Fleet economic info in the modelFleet economic info in the model

• Cost structures (2004)– Annual costs (£/vessel) – fuel costs (l/day, price),

other running costs (£/day)– Crew shares (%),

commissions (%)– Capital costs

• vessel for depreciation

• VCU/Quota values

• Cost information based on survey returns from SEAFISH survey, earlier survey work (updated) and additional financial information provided by fishers (following meetings)

• Cost information validated at meetings with fishers (Sept and October)

Other fleet informationOther fleet information• Days fished

– Inside and outside the area of the model

• External revenue– From activity outside the

area

– £/day – assumed constant

• Fishing powers– Varies by vessel size and

metier

0.0000

0.5000

1.0000

1.5000

2.0000

2.5000

3.0000

U1-1 U1-2 U1-3 U1-4 U1-5

Metier

Fis

hin

g p

ow

er

<7

7-10m

10-15m

15-24m

>24m

PricesPrices

• Vary by age class– Price grades derived from Newlyn market prices

• length based classes

– Converted to age specific prices based on length/age relationship

• Can vary with level of landings– Advice from last meeting with industry reps (Feb

2006) suggested to keep prices constant

Incorporating foreign fleets into the Incorporating foreign fleets into the modelmodel

• Fishing mortality of all external fleets included in the total mortality estimate

• Total catch of “other” fleets estimated in similar fashion to UK vessels

• Catch allocated to France, Spain, Belgium and Ireland in fixed proportions– Proportions vary by species

Recreational fishingRecreational fishing

• Target species:– bass, cod, mackerel, plaice, pollack,whiting, other

• Number of targeted trips– Changes with stock size based on Nautilus

elasticity

• Catch per trip– Changes in proportion with stock size

Other componentsOther components

• Environmental impacts – Currently based on a damage index

• Varies by metier

– Damage is function of index and effort per metier

• Regional economic model– Input/output model

ValidationValidation

-10

-8

-6

-4

-2

0

2

4

6

8

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Simulation Year (after 2003)

Eco

no

mic

pro

fit

(£ m

illi

on

)

Orginal base-case

Corrected base-case

Note: model no compliance model or enforcement costs

EnforcementEnforcement

MFA report (2006)

Enforcement - activityEnforcement - activityMFA report (2006)

MFA report (2006)

Consider: area with total - estimate costs for case study (could also request information?)

Summary Summary • Over quota (evidence of cod, sole)

• Mesh size• Declaring Sole (VIIe) as sole landed in VIId(?)

1975 1980 1985 1990 1995 2000 20050

50

01

00

01

50

0

Year

La

nd

ing

s

Other inputs: Imperial, MRAG, CEDEMUse model, update, single species, fleet?