West Hawaii Aquarium Project: Fishery Management of Marine Protected Areas

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West Hawaii Aquarium Project Fishery
Management of Marine Protected Areas

• Brian Tissot, Washington State University
  Vancouver
• William Walsh, Hawaii Division of Aquatic
  Resources Leon Hallacher, University of Hawaii
  Hilo

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WHAP Monitoring Program

• Study sites (23) - established March 1999
• 4 - 25 m transects
• Bimonthly fish surveys
• Annual surveys for corals
• Goal evaluate effectiveness of FRAs
• FRA
• Impact
• Control

Observationaldesign block
6 complete / 3 incomplete blocks
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WHAP coral surveys

• Goals
• Fish habitat characterization
• Detect reef damage and change
• Not designed for reef monitoring
• Criteria
• Detect change statistical power
• Cost efficiency

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WHAP survey design
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WHAP Benthic Habitat surveys

• Digital video camera
• Two laser system
• cross at 0.5m
• reference points

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WHAP Benthic Habitat analysis

• Used PointCount 99 for coral reefs
• 50 random points on each frame
• Substrate identified to lowest taxa

P. lobata
P. compressa
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WHAP survey design
25 m design
10 m design
N12 transects
N4 transects
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Comparison of coral survey methodsHonokohau,
west Hawaii
25 m method (n4 transects) 10 m
method (n12 transects) Transect Mean SD
N Transect Mean SD N A 57.0 16.1 36 A0 53.2 22
.3 13 B 47.7 15.1 37 A3 66.9 19.0 13 C 36.9 19.
7 28 A5 47.0 18.5 12 D 39.7 18.4 31 B1 43.0 24.
6 14 B2 39.9 15.1 13 ALL 46.1 18.7 132 B3
38.3 16.7 13 C0 42.7 16.3 13 C1 53.0 1
6.5 13 C3 41.2 14.2 13 D1 48.7 25.9 11
D2 49.3 20.4 13 D3 40.0 19.5 13
ALL 46.9 20.2 154
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Comparison of coral survey methods
Power analysis

• Criteria
• power 90 (?0.1 ?0.1)
• detect 10 change in coral cover

10 m method Nine transects n 10 frames
25 m method Four transects n 20 frames
Criteria reached for both methods at different
designs
? Both methods statistically equivalent
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Comparison of coral survey methods
Cost analysis
Field work Transect 8.33 Frame 0.25 Lab
work Transect 0.50 Frame 1.00
TotalCost
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Comparison of coral survey methods
Cost analysis
25 m method 136/site 10 m method 256/site
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Comparison of coral survey methods
Conclusions

• Similar power to detect change
• 25 m method simpler, faster, more cost efficient

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