A Bioeconomic Analysis of the Northern Baltic Salmon Fishery: Management of Competing Sequential Fisheries A Bioeconomic Analysis of the Northern Baltic.

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A Bioeconomic Analysis of the Northern Baltic Salmon Fishery: Management of Competing Sequential Fisheries A Bioeconomic Analysis of the Northern Baltic Salmon Fishery: Management of Competing Sequential Fisheries Kulmala Soile, Laukkanen Marita, Michielsens Catherine ESEE 2005

Structure of the talk Biological context Biological context Social context Social context Different salmon fisheries Different salmon fisheries Dealing with complexity Dealing with complexity Results Results

Biological and social context Decreasing number of salmon stocks Decreasing number of salmon stocks damming, pollution, overfishing damming, pollution, overfishing Tightened regulation Tightened regulation time and gear restrictions time and gear restrictions Conflicts between different user groups Conflicts between different user groups commercial versus recreational fishery commercial versus recreational fishery Active salmon fishery policy debate Active salmon fishery policy debate

Biological context Baltic Proper Bothnian Sea Gulf of Finland Bothnian Bay Gulf of Bothnia  Migration routes  Feeding areas  Present salmon rivers  Past salmon rivers

Social context Salmon Action Plan (SAP) Salmon Action Plan (SAP) conservation conservation yield maximization yield maximization Different fisheries Different fisheries fishing time and place fishing time and place gear gear salmon price salmon price fishing costs fishing costs recreational recreational commercial commercial

Social context ODN Salmon fisheries 1.Offshore driftnet (ODN) 2. Offshore longline (OLL) 3. Coastal driftnet (CDN) CDN 4. Coastal trapnet (CTN) CTN 5. River (RI) RI In 2006   OLL

Objectives of present study Realism to bioeconomic models Realism to bioeconomic models Charles and Reed (1985) Charles and Reed (1985) Laukkanen (2001) Laukkanen (2001) Contribution to fishery policy Contribution to fishery policy Optimal policy Optimal policy Effort allocation for active fisheries Effort allocation for active fisheries

Dealing with complexity Age-structured dynamic bioeconomic model for salmon Age-structured dynamic bioeconomic model for salmon 6 state variables 6 state variables 6 transition equations (4 different) 6 transition equations (4 different) 5 decision variables 5 decision variables

Analysis Steady state harvest policy Steady state harvest policy Optimal effort trajectories for active fisheries Optimal effort trajectories for active fisheries

Steady state Salmon fisheries  Commercial coastal trapnet (CTN) geardays (24 000) kg CTN  Recreational river (RI) 1730 angling days (8145) 976 kg RI

Optimal trajectory Coastal trapnet effort

Optimal trajectory River effort

Extensions Uncertainty Uncertainty recruitment recruitment stock measurement stock measurement Comparisons to biomass dynamic model Comparisons to biomass dynamic model