Role of IOOS in fisheries science and management? Power of IOOS data Models of fish distribution & abu Models useful for management Future applications
Dec 28, 2015
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?