Behavioural responses to structures on the seafloor by the deep-sea fish Coryphaenoides armatus: Implications for the use of baited landers

• Published in: Deep-sea research. Part I, Oceanographic research papers Vol. 53; no. 7; pp. 1157 - 1166
• Main Authors: Jamieson, A.J., Bailey, D.M., Wagner, H.-J., Bagley, P.M., Priede, I.G.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-07-2006; Elsevier; Pergamon Press Inc
• Subjects: Agnatha. Pisces; Animal and plant ecology; Animal behavior; Animal, plant and microbial ecology; Animals; Autoecology; Baited cameras; Biological and medical sciences; Coryphaenoides armatus; Deep-sea fish; Fish; Fish behaviour; Fishing; Food; Fundamental and applied biological sciences. Psychology; Marine; Marine biology; NE Atlantic; Underwater structures; Vertebrata; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution; East Atlantic; Atlantic Ocean; North Atlantic; Underwater structures; Fish behaviour; NE Atlantic; Baited cameras; Deep-sea fish; Benthic organism; Feeding behavior; Saprophagous; Underwater; Experimental device; Deep water; Trophic group; Coryphaenoides armatus; Marine environment; Aquatic environment; Capture rate; Vertebrata; Diet; Bait; Pisces; Benthos; Detritivorous
• ISSN: 0967-0637; 1879-0119
• DOI: 10.1016/j.dsr.2006.04.002

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.