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 transcript:

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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – 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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Schaefer model multi-gear multi-specific extension Equivalent Effort:  isi,isp rate of use of each gear in the catch of each species

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – 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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – BEMMFISH case study n.4 Ligurian demersal fisheries  Merlucius merlucius  Mullus barbatus  Aristeus antennatus  Nephrops norvegicus

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Technical matrix cs n.4

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – 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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – 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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Aristeus antennatus Identification cs n.4 Schaefer parameters k0k ,77 k1k1 3,66E+ 04 Short period S0,22 CHIFishing gear descriptionMAGP 88 1,00Coastal Bottom Trawlers4 H2

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – 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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Technical matrix -  values cs n.4

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Optimization  Optimization without any constraint  Optimization with biological constraint active when effort > MSY + Optimization with inertia constraint active for effort variation > F * standard deviation

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Optimization diagrams Merluccius merlucc. – Mullus barb. cs n.4

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Optimization diagrams Aristeus antenn. – Nefrops norveg. cs n.4

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Value Added maximization results cs n.4 Effort unitsVA MIO €  Effort % VA % Starting point ,80-- Inertia optimal point ,53-10,895,6 Biological optimal point ,02-17,9511,2 Economic optimal point ,9536,2562,7

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – BEMMFISH case study n.5 North and Central Adriatic small pelagic fisheries  Engraulis encrasicolus  Sardina pilchardus

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Technical matrix cs n.5

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Engraulis encrasicolus Identification cs n.5 Schaefer parametersShort period k0k ,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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Sardina pilchardus Identification cs n.5 Schaefer parametersShort period k0k ,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

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Technical matrix -  values cs n.5

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Optimization diagrams Engralious encr. – Sardina pilch. cs n.5

ISTITUTO RICERCHE ECONOMICHE PER LA PESCA E ACQUACOLTURA IREPA ONLUS October 18th - 22nd – – Value Added maximization results cs n.5 Effort unitsVA MIO €  Effort % VA % Starting point ,64-- Inertia optimal point ,0917,029,9 Biological optimal point ,78180,5206,1 Economic optimal point ,54214,2240,8