Introduction to Fisheries Economics

Introduction to Fisheries Economics
Key concepts, analytical tools, and policy implications

1. What Is Fisheries Economics?

• Definition: The study of how societies allocate resources (fish stocks, capital, labor, and technology) to produce and distribute fish and seafood.
• Scope:
  • Biological (stock dynamics, sustainability)
  • Economic (costs, revenues, market behavior)
  • Institutional (property rights, regulations, governance)
  • Social (livelihoods, cultural values)

2. Core Economic Principles Applied to Fisheries

3. Fishery Types & Management Regimes

4. Key Economic Variables

1. Catch (C) – quantity harvested (tons).
2. Stock biomass (B) – living fish mass available.
3. Price (P) – market value per unit weight (USD/ton).
4. Cost structure:
   • Variable costs (fuel, bait, labor).
   • Fixed costs (vessel purchase, licensing).
5. Profit (π):  π = P·C – (Variable + Fixed Costs).
6. Rent: Economic surplus after covering all costs; often captured by rights holders in regulated fisheries.

5. Biological–Economic Models

5.1. Gordon‑Schaefer Model (Simple Bio‑Economic Model)

• Biological component: Logistic growth
  [ \frac{dB}{dt}=rB\Bigl(1-\frac{B}{K}\Bigr)-C ]
  where r = intrinsic growth rate, K = carrying capacity.
• Economic component: Harvest revenue vs. cost
  [ \pi = P\cdot C - c\cdot E ]
  with E = effort, c = cost per unit effort.
• Equilibrium outcomes:
  • Maximum Sustainable Yield (MSY): Biomass = K/2, harvest = rK/4.
  • Maximum Economic Yield (MEY): Lower effort than MSY; maximizes profit.

5.