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Bathyal demersal fishes of the Charlie-Gibbs Fracture Zone region (49°–54°N) of the Mid-Atlantic Ridge: III. Results from remotely operated vehicle (ROV) video transects

Bathyal demersal fishes of the Charlie-Gibbs Fracture Zone region (49°–54°N) of the Mid-Atlantic Ridge: III. Results from remotely operated vehicle (ROV) video transects
Bathyal demersal fishes of the Charlie-Gibbs Fracture Zone region (49°–54°N) of the Mid-Atlantic Ridge: III. Results from remotely operated vehicle (ROV) video transects
Demersal fish were assessed by remotely operated vehicle (ROV) video transects at sites to the NE, NW (54°N), SE and SW (49°N) of the Charlie-Gibbs Fracture Zone (CGFZ) at ca. 2500 m depth on the Mid-Atlantic Ridge. At each site, three different slope categories (flat, 10° slope and >30° slope) were sampled with four transects, each surveying 2000 m3 of suprabenthic water. This resulted in 12 high-definition video transects at every site, covering a total of 24,000 m3 suprabenthic water. Six species were observed; which was fewer than in surveys using baited landers (19 species) and trawls (26 species) in the same area. Bathysaurus ferox, Halosauropsis macrochir, Antimora rostrata and Polyacanthonotus challengeri did not vary in density between sites, while Coryphaenoides brevibarbis and Coryphaenoides armatus were significantly more abundant at the northern sites; the latter supporting findings using baited landers. The halosaur H. macrochir was the only species affected by slope. The majority of observed fish showed no reaction to one or more of the stimuli produced by the ROV, however burst swimming was observed at least once in all species except B. ferox. The most abundant species, C. brevibarbis, was particularly affected by the presence of the ROV.
ECOMAR, Mid-Atlantic Ridge, Charlie-Gibbs Fracture Zone, ROV video transect, Sampling bias, Fish, Demersal, Density, Abundance, Reaction
0967-0645
407-411
Linley, Thomas D.
533697fa-7391-42ba-949c-2f491eb88fca
Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Priede, Imants G.
2e513dae-a9dd-45ed-8359-cee7e56e3097
Linley, Thomas D.
533697fa-7391-42ba-949c-2f491eb88fca
Alt, Claudia H.S.
aa8e3324-b74b-4678-b0e0-1cc1b1b80517
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Priede, Imants G.
2e513dae-a9dd-45ed-8359-cee7e56e3097

Linley, Thomas D., Alt, Claudia H.S., Jones, Daniel O.B. and Priede, Imants G. (2013) Bathyal demersal fishes of the Charlie-Gibbs Fracture Zone region (49°–54°N) of the Mid-Atlantic Ridge: III. Results from remotely operated vehicle (ROV) video transects. Deep Sea Research Part II: Topical Studies in Oceanography, 98, 407-411. (doi:10.1016/j.dsr2.2013.08.013).

Record type: Article

Abstract

Demersal fish were assessed by remotely operated vehicle (ROV) video transects at sites to the NE, NW (54°N), SE and SW (49°N) of the Charlie-Gibbs Fracture Zone (CGFZ) at ca. 2500 m depth on the Mid-Atlantic Ridge. At each site, three different slope categories (flat, 10° slope and >30° slope) were sampled with four transects, each surveying 2000 m3 of suprabenthic water. This resulted in 12 high-definition video transects at every site, covering a total of 24,000 m3 suprabenthic water. Six species were observed; which was fewer than in surveys using baited landers (19 species) and trawls (26 species) in the same area. Bathysaurus ferox, Halosauropsis macrochir, Antimora rostrata and Polyacanthonotus challengeri did not vary in density between sites, while Coryphaenoides brevibarbis and Coryphaenoides armatus were significantly more abundant at the northern sites; the latter supporting findings using baited landers. The halosaur H. macrochir was the only species affected by slope. The majority of observed fish showed no reaction to one or more of the stimuli produced by the ROV, however burst swimming was observed at least once in all species except B. ferox. The most abundant species, C. brevibarbis, was particularly affected by the presence of the ROV.

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More information

Published date: 15 December 2013
Keywords: ECOMAR, Mid-Atlantic Ridge, Charlie-Gibbs Fracture Zone, ROV video transect, Sampling bias, Fish, Demersal, Density, Abundance, Reaction
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 360976
URI: http://eprints.soton.ac.uk/id/eprint/360976
ISSN: 0967-0645
PURE UUID: a53986f2-5c97-48a7-9169-d89c807b738d

Catalogue record

Date deposited: 08 Jan 2014 14:06
Last modified: 08 Jan 2022 18:05

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Contributors

Author: Thomas D. Linley
Author: Claudia H.S. Alt
Author: Daniel O.B. Jones
Author: Imants G. Priede

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