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Home Science News Marine

Stock Rebuilding’s Impact on Korea’s Mackerel Fishery

April 27, 2025
in Marine
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Certainly! Here is a detailed summary and key points extracted from the extensive study you shared on rebuilding the mackerel fishery in Korea using a bioeconomic computable general equilibrium (CGE) model:


Summary of Study: Economic and Welfare Effects of Rebuilding the Mackerel Fishery in Korea


Background and Objective

  • Context: Fish stocks globally have been depleted due to overfishing, threatening marine ecosystems and the livelihoods of fishing communities. Managing depleted stocks and rebuilding them to sustainable levels is a pressing challenge.
  • Focus: This study uses a recursive dynamic CGE model to analyze the sub-national (Busan region) economic and welfare effects of rebuilding Chub mackerel (Scomber japonicus) stocks in Korea.
  • Goal: Evaluate trade-offs among various economic benefits from different levels of total allowable catch (TAC) reduction policies aimed at rebuilding the stock to Bmsy (biomass at maximum sustainable yield).

Methodology

  • Model: A bioeconomic CGE model that accounts for interactions between fishing and non-fishing sectors, factor markets, prices, outputs, and welfare.
  • Scenarios: 20 TAC reduction scenarios, from 5% to 100% reductions in increments of 5%, maintained until stock reaches Bmsy; then TAC fixed at MSY.
  • Timeline: 30 years of simulation, with comparison to a benchmark (no TAC change).
  • Measures of benefit:
    1. Fishing sector’s rent (profit)
    2. Fishing sector’s value-added
    3. Aggregate regional welfare

Key Findings

  • Trade-offs identified:

    • Larger TAC reductions lead to faster stock recovery but may have short-term negative welfare impacts.
    • Stock rebuilding benefits differ depending on which economic measure policymakers prioritize.
  • Benefit-maximizing percentage TAC cuts:

    • Largest rent increase: ~70% cut, rapid recovery (~4 years)
    • Largest value-added increase: ~35% cut, moderate recovery (~6 years)
    • Largest aggregate welfare gain: ~20% cut, slower recovery (~8 years)
  • Economic behavior and dynamics:

    • Fish prices initially rise when TAC is cut, leading to substitution toward imports.
    • Effort decreases more than the harvest decrease, increasing resource rent.
    • Short-term welfare may decline slightly with moderate TAC reductions but improve after stock rebuild.
  • Sensitivity analysis:

    • Results sensitive to intrinsic growth rate, initial biomass/capacity ratios, and discount rates.
    • Higher growth rates and higher initial biomass lead to quicker rebuilding and larger welfare gains.
    • Higher discount rates reduce optimal TAC cut size for maximizing rent and value-added.
    • Extreme TAC reductions (>90%) can reduce welfare overall.
  • Policy Implications:
    • If policymakers prioritize fishermen’s rent, they should consider steep TAC cuts for quick stock recovery but prepare for resistance due to short-term income loss and negative non-fishing sector effects.
    • If policymakers are interested in broader regional welfare, a more moderate TAC cut (~20-35%) over longer periods may be better.
    • Very small TAC reductions (<5%) delay recovery and reduce overall gains.
    • Government should avoid TAC cuts that are too large or too small and balance ecological and socio-economic objectives.
    • Current Korean government goals (15 years rebuilding timeline) are feasible with appropriately sized TAC cuts (~20-70%) given parameter uncertainties.

Practical Takeaways for Policymakers and Fishery Managers

Goal Suggested TAC Cut Approximate Recovery Time Considerations
Maximize Fishing Rent 70% ~4 years Fast recovery but potential short-term losses for others
Maximize Value-Added 35% ~6 years Balanced recovery, moderate welfare effects
Maximize Regional Welfare 20% ~8 years Slower recovery but maximizes overall societal benefits
  • Decision depends on the priority metric (fishermen’s profit, sector income, or total welfare).
  • The model emphasizes the importance of incorporating non-fishing sector impacts and general equilibrium effects for comprehensive fishery management.

Additional Notes

  • The bulk of mackerel harvest occurs via large purse seines, and Busan is the main landing point (~83% of catch).
  • The mackerel stock is currently at 61% of Bmsy, hence considered overfished.
  • The study uses robust economic techniques, including price and input substitution, to realistically model fisher behavior.
  • Incorporation of sensitivity checks bolsters confidence in the main qualitative conclusions despite parameter uncertainty.

If you want, I can also provide a more condensed executive summary, policy brief, or focus on specific sections like the methodology or robustness checks. Just let me know!

Tags: bioeconomic computable general equilibrium modelbiomass at maximum sustainable yieldBusan region economic analysisChub mackerel stock rebuildingeconomic impact of fisheriesfishing community welfarefishing sector profitabilitymackerel fishery managementmarine ecosystem conservationoverfishing consequencessustainable fishing practices KoreaTAC reduction policies
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