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ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS Efimas meeting Seville Spain 2004 December 21-22 C8 case Study presentation V. Placenti.

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Presentation on theme: "ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS Efimas meeting Seville Spain 2004 December 21-22 C8 case Study presentation V. Placenti."— Presentation transcript:

1 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS Efimas meeting Seville Spain 2004 December 21-22 C8 case Study presentation V. Placenti - placenti@irepa.org

2 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org2 Schaefer model Logistic catch-effort model. Catch/effort relationship:  C t - catches of the species at time t,  E t - effort on the species at time t  k 0, k 1, model parameters. mono-specific fisheries applicability

3 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org3 Schaefer model multi-gear multi-specific extension Equivalent Effort:  isi,isp rate of use of each gear in the catch of each species

4 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org4 Fishing gears vs.  isi,isp Chi coeff.Fishing gearMAGP 11 Ocean Trawlers and Purse Seiners 4HB 22 Mediterranean Bottom Trawlers 4H7 33 Mediterranean Polyvalent non trawlers 4H8 44 Mediterranean Tuna Purse Seiners 4H9 55 Mediterranean Swordfish 4HA 66 Coastal Pelagic Pair Trawlers 4H3 77 Coastal Hydraulic Dredges 4H5 88 Coastal Bottom Trawlers 4H2 99 Coastal Small Purse Seiners 4H4  10 Coastal Small Scale Fishery 4H1  11 Coastal Polyvalent 4H6

5 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org5 BEMMFISH case study n.4 Ligurian demersal fisheries  Merlucius merlucius  Mullus barbatus  Aristeus antennatus  Nephrops norvegicus

6 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org6 Technical matrix cs n.4

7 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org7 Merlucius merlucius Identification cs n.4 Schaefer parameters k0k0 5030,06 k1k1 1,68E+ 03 Short period S0,55 CHIFishing gear descriptionMAGP 88 0,66Coastal Bottom Trawlers4 H2 99 1,00Coastal Small Purse Seiners4 H4

8 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org8 Mullus barbatus Identification cs n.4 Schaefer parameters k0k0 5433,51 k1k1 1,81E+ 03 Short period S0,90 CHIFishing gear descriptionMAGP 88 0,48Coastal Bottom Trawlers4 H2 99 1,00Coastal Small Purse Seiners4 H4

9 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org9 Aristeus antennatus Identification cs n.4 Schaefer parameters k0k0 11351,77 k1k1 3,66E+ 04 Short period S0,22 CHIFishing gear descriptionMAGP 88 1,00Coastal Bottom Trawlers4 H2

10 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org10 Nephrops norvegicus Identification cs n.4 Schaefer parameters k0k0 2614,61 k1k1 8,71E+ 02 Short period S0,53 CHIFishing gear descriptionMAGP 99 0,45Coastal Small Purse Seiners4 H4  11 0,001Coastal Polyvalent4 H6

11 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org11 Technical matrix -  values cs n.4

12 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org12 Optimization  Optimization without any constraint  Optimization with biological constraint active when effort > MSY + Optimization with inertia constraint active for effort variation > F * standard deviation

13 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org13 Optimization diagrams Merluccius merlucc. – Mullus barb. cs n.4

14 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org14 Optimization diagrams Aristeus antenn. – Nefrops norveg. cs n.4

15 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org15 Value Added maximization results cs n.4 Effort unitsVA MIO €  Effort % VA % Starting point2.328.3401,80-- Inertia optimal point2.075.2903,53-10,895,6 Biological optimal point1.911.36011,02-17,9511,2 Economic optimal point3.171.74011,9536,2562,7

16 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org16 BEMMFISH case study n.5 North and Central Adriatic small pelagic fisheries  Engraulis encrasicolus  Sardina pilchardus

17 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org17 Technical matrix cs n.5

18 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org18 Engraulis encrasicolus Identification cs n.5 Schaefer parametersShort period k0k0 28441,52S0,20 k1k1 1,01E+ 04 CHIFishing gear descr.MAGP 66 0,01Coastal Pelag. P. Tr.4 H3 88 1,00Coastal Bottom Tr.4 H2  11 0,73Coastal Polyvalent4 H6

19 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org19 Sardina pilchardus Identification cs n.5 Schaefer parametersShort period k0k0 565546,23S0,32 k1k1 1,88E+ 05 CHIFishing gear descr.MAGP 66 1,00Coastal Pelag. P. Tr.4 H3 88 0,68Coastal Bottom Tr.4 H2  11 1,00Coastal Polyvalent4 H6

20 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org20 Technical matrix -  values cs n.5

21 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org21 Optimization diagrams Engralious encr. – Sardina pilch. cs n.5

22 ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd 2004accadia@irepa.org – placenti@irepa.org – sacco@irepa.org22 Value Added maximization results cs n.5 Effort unitsVA MIO €  Effort % VA % Starting point11.499.800111,64-- Inertia optimal point13.457.300145,0917,029,9 Biological optimal point32.263.400341,78180,5206,1 Economic optimal point36.133.900380,54214,2240,8

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