Role of IOOS in fisheries science and management?
description
Transcript of Role of IOOS in fisheries science and management?
Role of IOOS in fisheries science and management?
Power of IOOS data
Models of fish distribution & abundance
Models useful for management
Future applications
What can we measure without going to sea that fish “care” about?
Benthic
Depth (log-transformed)Profile curvatureSlope (residuals vs. depth)Sediment grain size
IOOS
SST488 nm reflectance551 nm reflectance (residuals vs. 488 nm)Cross-shore velocityVariance in cross-shore velocityDivergence trend
Mixed-layer depthSimpson’s PE (limited to top 30 m)Bottom tempBottom salinity (residuals vs. depth)
CTD
Multivariate AnalysisFinal Environmental Variables Used
TempDepth
551 nm resids
Statistical models of fish-habitat association
Benthic Depth (log-transformed)
Profile curvatureSlope (residuals vs. depth)Sediment grain size
IOOSSST488 nm reflectance551 nm reflectance (residuals vs. 488 nm)Cross-shore velocityVariance in cross-shore velocityDivergence trend
CTDMixed-layer depthSimpson’s PE (limited to top 30 m)Bottom tempBottom salinity (residuals vs. depth)
CTD
Habitat data
Example: Longfin squid (live one year) Prey for fish, seabirds, sharks, seals, whales Predator of young stages of fish & crabs (eat ~500,000 tons of prey yr; ~33 x annual production of Fluke)
CPUE= bottom temperature + sediment grain size + current divergence + N488 radiance +(depth x SST) + (cross x along shelf current v)
Preliminary squid model (adjusted R2 = 0.85)IOOS Increased model power ~12-20%
Divergence
HF radarDivergence potential
Longfin squid
Test in IOOS informed studies of habitat on movement, growth, mortality & reproductive rates
Hypothesis: Upwelling & 1’+2’ production => high squid growth & size dependent survival?
upwelling
downwelling
HF radar divergence & upwelling-downwelling potentialUpwelling
Down welling
Models useful for Fisheries Management, stock assessement, spatial planning?
• Need natural (& fishing) mortalities for stock assessments– Spiny dogfish may eat 25,000 to 120,000 tons of squid a year.
(Fishery harvest in 2007: 12,300 tons) – IOOS informed models of dogfish, squid distributions & habitat specific encounter rates. Where/when is natural mortality likely to be high?
• Bycatch of butterfish in squid fishery– Under what habitat conditions do squid & butterfish co-occur? – Use IOOS to tell squid fisherman where to fish
avoid large butterfish bycatch.
Two examples:
TemperatureSalinity
bb(532)/c(532)
Optical backscatterbb532
Ecosystem Monitoring:Cold pool dynamics, Climate change &
Fish Recruitment
Recruitment of some species in MAB tied to Cold Pool Dynamics (e.g. yellowtail flounder, surf clams)
Timing of Cold Pool turnover & bottom warming may affect survival of early stages of some MAB species.What are the mechanisms?
• Online survey (43 Atlantic coast scientists & managers)
• Presentation to MAFMC (June 2009)
• Coordination with SSC
• Interviews about current research needs
Relevance to Resource Management?