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

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

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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.
Original languageEnglish
Pages (from-to)407-411
Number of pages5
JournalDeep Sea Research Part II: Topical Studies in Oceanography
Volume98
Issue numberPart B
Early online date28 Aug 2013
DOIs
Publication statusPublished - 15 Dec 2013

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demersal fish
remotely operated vehicle
fracture zone
transect
surveying
video
water
fish

Keywords

  • ECOMAR
  • Mid-Atlantic Ridge
  • Charlie-Gibbs Fracture Zone
  • ROV video transect
  • Sampling bias
  • Fish
  • Demersal
  • Density
  • Abundance
  • Reaction

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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. / Linley, Thomas D.; Alt, Claudia H. S. ; Jones, Daniel O.B.; Priede, Imants G.

In: Deep Sea Research Part II: Topical Studies in Oceanography, Vol. 98, No. Part B, 15.12.2013, p. 407-411.

Research output: Contribution to journalArticle

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