Behavioural responses to structures on the seafloor by the deep-sea fish Coryphaenoides armatus: Implications for the use of baited landers |
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| Affiliation: | 1. Oceanlab, University of Aberdeen, Main Street, Newburgh, Aberdeenshire, AB41 6AA, UK;2. Anatomisches Institut, Universität Tübingen, Oesterbergstrasse 3, D-72074 Tübingen, Germany;1. Institute of Biological and Environmental Sciences, University of Aberdeen, Zoology Building, Aberdeen AB24 2TZ, UK;2. Oceanlab, University of Aberdeen, Newburgh, Aberdeenshire AB41 6AA, UK;1. Oceanlab, Institute of Biological and Environmental Sciences, University of Aberdeen, Main Street, Newburgh, Aberdeenshire AB41 6AA, UK;2. Institute of Biological and Environmental Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen AB24 2TZ, UK;3. National Institute of Water & Atmospheric Research (NIWA), 301 Evans Bay Parade, Wellington 6021, New Zealand;1. Institute of Biological and Environmental Sciences, University of Aberdeen, Zoology Building, Aberdeen AB24 2TZ, UK;2. Oceanlab, University of Aberdeen, Newburgh, Aberdeenshire AB41 6AA, UK;3. School of Marine Science and Technology, Ridley Building, Newcastle University, Newcastle Upon Tyne NE1 7RU, UK;1. Department of Oceanography, University of Hawaiʻi at Mānoa, Honolulu, HI 96822, USA;2. Department of Geology and Geophysics, University of Hawaiʻi at Mānoa, Honolulu, HI 96822, USA;3. Oceanlab, University of Aberdeen, Main Street, Newburgh, Aberdeenshire AB41 6AA, UK |
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| Abstract: | Coryphaenoides armatus plays a fundamental role in the dispersal of organic matter on the deep-sea floor by consuming food-falls. The use of baited cameras to study population parameters (e.g. abundances and size frequencies) assumes that members of this species follow odour plumes directly to bait, appear immediately in the field of view, and depart as predicted by optimal foraging theory. Described here are behaviours to the contrary observed during the operation and development of more complex baited camera systems. Of the 247 C. armatus observed by a video lander, 72.5% of the fish explored the structure whilst only 6% fed, and 21.5% were indifferent. This exploratory behaviour increased individual staying time by 38.4% compared to those that just fed. Experiments with several models of in situ fish respirometry lander showed the importance of both equipment design, and an understanding of the behaviour of the target animals in maximising capture success. These results show how previously unexpected aspects of behaviour by C. armatus can greatly affect the chances of capturing members of this species and influence the results of baited camera experiments. |
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