Assessing the Chesapeake Bay Forage Base: …...Assessing the Chesapeake Bay Forage Base: Existing...
Transcript of Assessing the Chesapeake Bay Forage Base: …...Assessing the Chesapeake Bay Forage Base: Existing...
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Assessing the Chesapeake Bay Forage Base:
Existing Data and Research Priorities
Scientific and Technical Advisory Committee Workshop
Solomons, MD
12 – 13 November 2014
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What Managed Predators Should Be Our Focus?
What Forage Species Are Most Vital to Consider / Manage?
The Existing Data
Chris Bonzek, VIMS
Field and Lab Staffs for ChesMMAP, CHESFIMS, VIMS Trawl Tom Ihde, NOAA
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Surveys: ChesMMAP:
• Chesapeake Bay Multispecies Monitoring and Assessment Program
CHESFIMS: • Chesapeake Bay Fishery Independent
Monitoring Survey
VIMS Trawl/CTILS: • Chesapeake Trophic Interactions
Laboratory Services
Data Sources
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ChesMMAP:
Data Sources
• 2002 – Present (Ongoing)
• Bottom Trawl Survey • Design: Random Stratified
• Targets Late-Juvenile-to-Adult Fishes
• Bay Main-Stem (Baltimore to Bay Mouth)
• Five Cruises per Year
(Mar-May-Jul-Sep-Nov)
• ~80 Stations per Cruise
• Counts-Biomass-Lengths-Sex-Maturity-Age-Diets (Nearly all species encountered)
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CHESFIMS:
Data Sources
• 2001 – 2006
• Midwater Trawl Survey • Design: Combination Random/ Fixed
• Primarily Juvenile Fishes
• Bay Main-Stem (Baltimore to Bay Mouth)
• Three Cruises per Year
(Spring – Summer - Fall)
• ~40 Stations per Cruise
• Counts-Biomass-Lengths-Sex-Maturity-Age-Diets (Selected Species)
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VIMS Trawl / CTILS:
Data Sources
• VIMS Trawl: 1955-Present CTILS: 2003-2007
• Bottom Trawl Survey • Design: Random Stratified
• Primarily Juvenile Fishes
• Bay Main-Stem and Major Rivers
CTILS Samples From the Rivers Only
• Twelve Cruises per Year
• ~110 Stations per Cruise
• Counts-Lengths
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Species: Baywide Piscivores:
• Summer Flounder • Striped Bass
Baywide Benthic Feeder:
• Atlantic Croaker
Upper Bay Species: • White Perch
Lower Bay Species:
• Clearnose Skate
Analyses Presented: Length Frequencies & Catch Maps
• By Survey if Available
Diets: All Data Pooled • By Survey if Available
Diets: Annual Variability
• ChesMMAP Only
Diets: By Size/Age • By Survey if Available
Diets: Upper v. Lower Bay • ChesMMAP Only
Diets: Variability of Main Forage
• ChesMMAP Only
Representative Species / Summaries
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Summer Flounder
ChesMMAP
VIMS Trawl / CTILS
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Summer Flounder All Years/Months/Regions/Sizes
ChesMMAP
VIMS Trawl / CTILS
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Summer Flounder Annual Variability
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Summer Flounder Annual Variability
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Summer Flounder – Size/Age Variability
ChesMMAP
VIMS Trawl / CTILS
Small (~Age-0)
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Summer Flounder – Size/Age Variability Small (~Age-0) Large (~Age-1 and older)
ChesMMAP
VIMS Trawl / CTILS
ChesMMAP
VIMS Trawl / CTILS
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0 10
20
30
40
2 4 6 8
Forage Groups that Compose > 5% of Summer Flounder Diet in any Sample (ChesMMAP only)
Forage Groups
Per
cent
age
of D
iet
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0 10
20
30
40
Per
cent
age
of D
iet
Forage Groups that Compose > 5% of Summer Flounder Diet in any Sample (ChesMMAP only)
• Bay anchovy • Mysids • Sand shrimp • Weakfish • Spot • Mantis shrimp • Spotted hake • Atl. croaker
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Striped Bass ChesMMAP
CHESFIMS
VIMS Trawl / CTILS
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ChesMMAP Striped Bass All Years/Months/
Regions/Sizes
VIMS Trawl
CHESFIMS
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ChesMMAP Striped Bass All Years/Months/
Regions/Sizes
VIMS Trawl
ChesMMAP (no cluster)
CHESFIMS
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Striped Bass Annual Variability (ChesMMAP Only)
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Striped Bass Annual Variability (ChesMMAP Only)
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Striped Bass – By Size/Age
These Surveys Do Not Lend Themselves to This Analysis for This Species
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Striped Bass Upper Bay v. Lower Bay (Proxy for Salinity)
ChesMMAP
ChesMMAP
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Forage Groups that Compose > 5% of Striped Bass Diet in any Sample (ChesMMAP only)
0 10
20
30
40
Forage Groups
Per
cent
age
of D
iet
2 4 6 8 10 1 3 5 7 9 11
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Forage Groups that Compose > 5% of Striped Bass Diet in any Sample (ChesMMAP only)
0 10
20
30
40
Per
cent
age
of D
iet
• Bay anchovy • Mysids • Nereis spp. • Menhaden • Polychaetes • Amphipods & isopods • Weakfish • Spot
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Atlantic Croaker ChesMMAP
CHESFIMS
VIMS Trawl / CTILS
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Atlantic Croaker All Years/Months/
Regions/Sizes
ChesMMAP
CHESFIMS
VIMS Trawl
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Atlantic Croaker Annual Variability (ChesMMAP Only)
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Atlantic Croaker Annual Variability (ChesMMAP Only)
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Atlantic Croaker – By Size/Age
CHESFIMS
VIMS Trawl / CTILS
CMMAP
Small (~Age-0)
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Atlantic Croaker – By Size/Age Small (~Age-0) Large (~Age-1 and older)
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Atlantic Croaker Upper Bay v. Lower Bay (Proxy for Salinity)
ChesMMAP
ChesMMAP
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0 5
10
15
20
25
Forage Groups that Compose > 5% of Atlantic Croaker Diet in any Sample (ChesMMAP only)
Forage Groups
Per
cent
age
of D
iet
2 4 6 8 10 1 3 5 7 9 11
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0 5
10
15
20
25
Forage Groups that Compose > 5% of Atlantic Croaker Diet in any Sample (ChesMMAP only)
Per
cent
age
of D
iet
• Polychaetes • Trumpet worm • Mysids • Nereis spp. • Bloodworms • Mantis shrimp • Razor clams • Amphipods • Bay anchovy
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White Perch ChesMMAP
CHESFIMS
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White Perch All Years/Months/Regions/Sizes
CHESFIMS
ChesMMAP
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White Perch ChesMMAP - Annual Variability
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White Perch ChesMMAP - Annual Variability
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White Perch – By Size/Age
CHESFIMS
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2 4 6 8 10
0 10
20
30
40
Forage Groups that Compose > 5% of White Perch Diet in any Sample (ChesMMAP only)
Forage Groups
Per
cent
age
of D
iet
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0 10
20
30
40
Forage Groups that Compose > 5% of White Perch Diet in any Sample (ChesMMAP only)
Per
cent
age
of D
iet
• Amphipods • Polychaetes • Nereis spp. • Macoma spp. • Isopods & copepods • Mud crabs • Bay anchovy
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Clearnose Skate ChesMMAP Only
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Clearnose Skate ChesMMAP – All Years/Months/Regions/Sizes
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Clearnose Skate ChesMMAP - Annual Variability
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Clearnose Skate ChesMMAP - Annual Variability
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5 10 15
0 5
10
15
20
Forage Groups that Compose > 5% of Clearnosed Skate Diet in any Sample (ChesMMAP only)
Forage Groups
Per
cent
age
of D
iet
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0 5
10
15
20
Per
cent
age
of D
iet
Forage Groups that Compose > 5% of Clearnosed Skate Diet in any Sample (ChesMMAP only)
• Lady crab • Mantis shrimp • Sand shrimp • Atl. Croaker • Atl. Rock crab • Razor clams • Tagelus clams • Blackcheek tonguefish • Alt. Jackknife clam • Spot • Weakfish • Kingfish • Flounder
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Sooooo…..What’s Important?
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Species: Baywide Piscivores:
• Summer Flounder • Striped Bass
Baywide Benthic Feeder:
• Atlantic Croaker
Upper Bay Species: • White Perch
Lower Bay Species:
• Clearnose Skate
Representative Species / Summaries (ChesMMap) Summer Flounder: * Bay anchovy * Weakfish * Spotted hake * Mysids * Spot * Atl. croaker * Sand shrimp * Mantis shrimp
Striped Bass: * Bay anchovy * Nereis spp. * Weakfish * Mysids * Menhaden * Spot
* Polychaetes * Amphipods & isopods
Atlantic Croaker: * Polychaetes * Nereis spp. * Razor clams * Trumpet worm * Bloodworms * Amphipods * Mysids * Mantis shrimp * Bay anchovy
White Perch: * Amphipods * Macoma spp. * Bay anchovy * Polychaetes * Isopods & copepods * Nereis spp. * Mud crabs
Clearnose Skate: * Lady crab * Atl. Croaker * Blackcheek * Atl. Rock crab tonguefish * Mantis shrimp * Razor clams * Alt. Jackknife * Sand shrimp * Tagelus clams clam * Spot * Weakfish * Kingfish * Flounder
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Species: Baywide Piscivores:
• Summer Flounder • Striped Bass
Baywide Benthic Feeder:
• Atlantic Croaker
Upper Bay Species: • White Perch
Lower Bay Species:
• Clearnose Skate
Representative Species / Summaries (ChesMMap) Summer Flounder: * Bay anchovy * Weakfish * Spotted hake * Mysids * Spot * Atl. croaker * Sand shrimp * Mantis shrimp
Striped Bass: * Bay anchovy * Nereis spp. * Weakfish * Mysids * Menhaden * Spot
* Polychaetes * Amphipods & isopods
Atlantic Croaker: * Polychaetes * Nereis spp. * Razor clams * Trumpet worm * Bloodworms * Amphipods * Mysids * Mantis shrimp * Bay anchovy
White Perch: * Amphipods * Macoma spp. * Bay anchovy * Polychaetes * Isopods & copepods * Nereis spp. * Mud crabs
Clearnose Skate: * Lady crab * Atl. Croaker * Blackcheek * Atl. Rock crab tonguefish * Mantis shrimp * Razor clams * Alt. Jackknife * Sand shrimp * Tagelus clams clam * Spot * Weakfish * Kingfish * Flounder
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Species: Baywide Piscivores:
• Summer Flounder • Striped Bass
Baywide Benthic Feeder:
• Atlantic Croaker
Upper Bay Species: • White Perch
Lower Bay Species:
• Clearnose Skate
Representative Species / Summaries (ChesMMap) Summer Flounder: * Bay anchovy * Weakfish * Spotted hake * Mysids * Spot * Atl. croaker * Sand shrimp * Mantis shrimp
Striped Bass: * Bay anchovy * Nereis spp. * Weakfish * Mysids * Menhaden * Spot
* Polychaetes * Amphipods & isopods
Atlantic Croaker: * Polychaetes * Nereis spp. * Razor clams * Trumpet worm * Bloodworms * Amphipods * Mysids * Mantis shrimp * Bay anchovy
White Perch: * Amphipods * Macoma spp. * Bay anchovy * Polychaetes * Isopods & copepods * Nereis spp. * Mud crabs
Clearnose Skate: * Lady crab * Atl. Croaker * Blackcheek * Atl. Rock crab tonguefish * Mantis shrimp * Razor clams * Alt. Jackknife * Sand shrimp * Tagelus clams clam * Spot * Weakfish * Kingfish * Flounder