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Optimal Spatial Fishery Management for the Southern California Bight

A Coastal Environmental Quality Initiative (CEQI) Project. Optimal Spatial Fishery Management for the Southern California Bight. Dave Siegel, Chris Costello, Satoshi Mitarai (UCSB), Jim McWilliams & Charles Dong (UCLA). A CEQI Project. Assess optimal fishery design for SoCal Bight

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Optimal Spatial Fishery Management for the Southern California Bight

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  1. A Coastal Environmental Quality Initiative (CEQI) Project Optimal Spatial Fishery Management for the Southern California Bight • Dave Siegel, Chris Costello, Satoshi Mitarai (UCSB), • Jim McWilliams & Charles Dong (UCLA)

  2. A CEQI Project • Assess optimal fishery design for SoCal Bight • Combine established expertise in modeling • California coastal circulation (UCLA) • Larval dispersal & optimal fishery management (UCSB) • Timeline • 2007-2008, modeling larval of dispersal (awarded) • 2008-2009, develop optimal fishery management (proposed)

  3. Lagrangian Particle Tracking • Implement Lagrangian particle tracking in ROMS by Dong and McWilliams (2007) Release sites Single-day release from San Nicholas Blue circles: area covered by a site (5-km radius) Particles are released every 6 hours every 1km Blue lines: 30-day trajectories Red dotes: particle positions after 30 days

  4. Lagrangian PDFs • Computed from Lagrangian particle trajectories From San Nicholas, as a function of travel time From 9 different sites 30-day travel time Used particles released from 01/1996 to 12/1999

  5. # of larvae produced at y Fraction of larvae transported to x Recruitment success (%) Fishery Management • Max {a*Stock + Profit}, for different weights, a # of adults at x in year n+1 # of survivors at x in year n # of recruits to x from everywhere = + Harvesting (fishery management) Connectivity (assessed from Lagrangian PDF) y x

  6. Publications in Prep • Mitarai et al., for JGR - Oceans • “Another Place for Physical Oceanography: Quantifying Connectivity in the Coastal Ocean” • Watson et al., for MEPS • “Roles of larval life history and interannual variability on modeled connectivity patterns” • Chris et al., for Science • “Optimal fishery management scenarios for the SoCal Bight”

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