Scavenging deep demersal fishes of the Porcupine Seabight, North-east Atlantic: observations by baited camera, trap and trawl

Imants George Priede, Philip Michael Bagley, A. Smith, S CREASEY, N R MERRETT

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141 Citations (Scopus)

Abstract

Demersal fishes on the continental rise and slope were sampled by trawl, baited trap and a baited camera. Seventy-one different species were trawled, but only 18 species approached baits. At rise soundings (4100 m to 2250 m) Coryphaenoides (Nematonurus) armatus was dominant at baits and comprised 41.5% of the trawl catch. On the slope (<2250 m) Synaphobranchus kaupi was dominant at baits and comprised 32.7% of the trawl catch. At 1500-2501 m Antimora rostrata competed at baits and comprised 5-10% of trawl catches. At 1500-1650 m Centroscymnus coelolepis also consumed baits but was not captured by trawl. For C. (N.) armatus abundance was proportional to t(arr)-2 (where t(arr) = arrival time), demonstrating that arrival time of the first fish at baits provides an estimate of population density. Maximum estimated abundance at 2897 m was 877 km-2, more than five times the abundance on the abyssal plain. Halosauropsis macrochir, Lepidion eques, Coryphaenoides guentheri, Gadiculus argenteus and Coryphaenoides rupestris were important in trawl samples but absent or rare at baits.

Original languageEnglish
Pages (from-to)481-498
Number of pages18
JournalJournal of the Marine Biological Association of the United Kingdom
Volume74
Issue number3
Publication statusPublished - Aug 1994

Keywords

  • Rockall Trough
  • assemblage structure
  • forgaing behavior
  • sea fish
  • ocean
  • diets
  • coryphaenoides-(nematonurus)-armatus
  • tracking
  • Pacific
  • biology

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