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Red snapper ( Lutjanus campechanus ) research at Dauphin Island Sea Lab. Dr. John Dindo , Dauphin Island Sea Lab. OUTLINE. PART I: Red snapper and a history of the fishery PART II: Habitat creation and restoration PART III: Red snapper population assessment.

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dr john dindo dauphin island sea lab

Red snapper (Lutjanuscampechanus) research at Dauphin Island Sea Lab

Dr. John Dindo, Dauphin Island Sea Lab

outline
OUTLINE
  • PART I: Red snapper and a history of the fishery
  • PART II: Habitat creation and restoration
  • PART III: Red snapper population assessment
history of the red snapper fishery

U.S. Landings of Red Snapper in U.S. Waters 1880-2003

7000000

Beginning of oil exploration in western gulf

6000000

5000000

Commercial Landings (lbs)

4000000

East

West

3000000

2000000

1000000

0

1880

1890

1900

1910

1920

1930

1940

1950

1960

1970

1980

1990

2000

big drop as fleet spends more effort off Campeche

move to Campeche complete

increasing local catch by “boats” (vessels <5 tons)

Great Depression

World War II

Boat building boom

History of the Red Snapper Fishery

2007 New Snapper Regulations???

Clay E. Porch, Stephen C. Turner, and Michael J. Schirripa. 2004. The commercial landings of red snapper in the Gulf of Mexico from 1872 to 1962. SEDAR7-AW-22 (data 1880-1962).

John R. Poffenberger and Stephen C. Turner. 2004. Documentation on the preparation of the database for the red snapper stock assessment SEDAR workshop. SEDAR7-AW-17rev. (data 1962-2003)

slide7

Total Area = 3,108 km2

Corp of Engineers pre-permitted since 1987

Estimated over 20,000

structures deployed since 1958

Alabama’s Artificial Reef System

AL

MS

FL

LA

hugh swingle area
Hugh Swingle Area
  • MRD Reefs consist of Liberty ships, tanks, barges, toppled rigs, and concrete bridge rubble
  • Recreational fisherman can deploy “private” reefs with pre-approved materials
  • USA deploys and maintains concrete aggregate research modules within Hugh Swingle

Courtesy ALMRD

habitat creation restoration
Habitat Creation & Restoration
  • Builds on 10 year tagging program: existing reefs installed 1998
  • Primary study units: ~ 18 ”private” reef complexes(reef balls, grouper ghettos)
  • Additional artificial reefs sampled: 12 public reefs(tanks, ships, barges, bridge rubble)
abundant target species
Abundant Target Species

Red Snapper

Grey Triggerfish

Red Grouper

Vermilion Snapper

Gag Grouper

Scamp

slide11

Sampling Methods

  • 8 stations fished 30 min each
  • Fishing effort: 10 anglers with bottom & sow rigs
  • Size measurements (FL/TL)
  • Target fishes are tagged & released, & condition index is recorded
  • Recapture information gathered from fishermen
slide12

Fishers’ Recoveries

slide courtesy of Will Patterson

Net movement from NCG to east, southeast

Little observed movement to west

red snapper population assessment
Red snapper population assessment
  • Multi-gear sampling program designed to address critical data needs for future stock assessment
    • Side scan sonar
    • Bottom trawl
    • ROV
    • Vertical longline
    • Bottom longline
acknowledgements
Acknowledgements

Captains Mike and Skipper Theirryand the crew of the boats “Lady Ann” and “Escape”

Tech Support, boat time, fishing volunteers and graduate students