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The influence of bait and stereo video on the performance of a video lander as a survey tool for marine demersal reef fishes in Oregon waters

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  • We evaluated how the use of bait as a fish attractant influenced the species and size composition 20 of demersal fishes viewed with a stereo video lander, at 160 sampling sites at Stonewall Bank, a 21 deepwater rocky reef complex in Oregon waters. We also studied the effectiveness of stereo 22 video for generating estimates of fish length and distance from the cameras. Bait altered the 23 species composition of fish encountered (P<0.05), increasing the mean counts (MaxN, see text) 24 of demersal fishes by 47% (P<0.01), with increases of 135-250% for Rosethorn Rockfish 25 Sebastes helvomaculatus (P<0.05), Northern Ronquil Ronquilis jordani (P<0.05) and Spotted 26 Ratfish Hydrolagus colliei (P<0.05). Increases in the mean counts of 35-150% for unidentified 27 sculpins (Cottidae) and Yelloweye Rockfish S. ruberrimus and Quillback Rockfish S. maliger, 28 were non-significant (P>0.05). The calibrated stereo video lander provided acceptably precise 29 estimates of fish length and distance (range of three replicate measurements less than 3 cm and 30 20 cm for length and distance, respectively) for 34.3% of the demersal fishes that were counted. 31 The precision of length and distance estimates declined with increased distance, with acceptable 32 estimates typical within 200 cm distance and infrequent beyond 500 cm. Bait reduced the mean 33 distance at which acceptable estimates of demersal fish length and distance were obtained, from 34 264 cm to 200 cm (P<0.01), but had no effect on mean fish length for the three most frequently 35 encountered demersal species (P>0.05). The combined effect of bait on demersal fish counts and 36 mean distance from the cameras more than doubled the efficiency of the stereo video lander for 37 generating fish length and distance estimates.
  • This is an author's peer-reviewed final manuscript, as accepted by the publisher. The article is copyrighted by the American Fisheries Society and published by Taylor & Francis. It can be found at: http://www.tandfonline.com/doi/full/10.1080/19425120.2014.920745 .
  • Keywords: Pacific rockfish, sampling methods, temperate reefs, untrawlable habitat, marine protected areas, underwater visual census
  • Keywords: Pacific rockfish, sampling methods, temperate reefs, untrawlable habitat, marine protected areas, underwater visual census
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  • Hannah, R., & Blume, M. (2014). The influence of bait and stereo video on the performance of a video lander as a survey tool for marine demersal reef fishes in Oregon waters. Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science, 6(1), 181-189. doi:10.1080/19425120.2014.920745
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  • 6
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