In situ swimming behaviour of individual mesopelagic fish studied by split-beam echo target tracking

T. Torgersen*, Stein Kaartvedt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The mesopelagic fishes Müller's pearlside (Maurolicus muelleri) and northern lantern-fish (Benthosema glaciale) were studied in near-surface water during their diel vertical migrations. The fish apparently alternated between swimming predominantly vertically and horizontally, although many fish were descending slowly (∼1 cm s -1) during horizontal swimming. Vertical swimming speeds during rapid ascents and descents were typically 10-30 cm s -1, corresponding to several body lengths s -1. Horizontal swimming paths varied extensively, some fish following a rather straight track, others displaying pronounced smooth or sharp turns. Horizontal swimming speeds appeared to be in the same range as the vertical swimming speeds during ascents and descents, but were less reliably estimated as this component was more affected by noise than the vertical component. Both the advantages and limitations of the split-beam tracking technique in behavioural studies are discussed in light of these observations.

Original languageEnglish (US)
Pages (from-to)346-354
Number of pages9
JournalICES Journal of Marine Science
Volume58
Issue number1
DOIs
StatePublished - Jan 1 2001

Keywords

  • Acoustic methodology
  • Diel vertical migration
  • Swimming pattern
  • Swimming speed

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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