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Title: Individual daytime swimming of mesopelagic fishes in the world's warmest twilight zone
Authors: Sobradillo, Beatriz; Christiansen, Svenja; Rostad, Anders; Kaartvedt, Stein
Abstract: We assessed the activity and swimming patterns of mesopelagic fishes in the Red Sea using bottom-moored, upward-facing echosounders deployed at 555 and 700 m depth. The vertically migrating mesopelagic scattering layer descended close to the bottom during daytime. This permitted assessment of behavior at mesopelagic depths by applying acoustic target tracking for individuals traversing the acoustic beam. Swimming activity did not fit the notion of torpid behavior in the daytime habitat. The fishes were moving continuously, with a prevailing downward direction before noon and upward after, though individuals were swimming in both directions at all times. They moreover were swimming horizontally at estimated speeds of similar to 2.1 cm s(-1), suggesting similar to 0.5-1 body length s(-1), intermittently turning. High activity at high temperatures suggests high respiration at depth, considered a key element for the active carbon pump.
Keywords: Red sea; Bottom-moored echosounder; Diel vertical migration; Individual swimming behavior; Activity; VERTICAL-DISTRIBUTION; SCATTERING LAYERS; MIDWATER FISHES; CARBON EXPORT; ZOOPLANKTON; MICRONEKTON; MIGRATION; DEEP; AGGREGATIONS; METABOLISM
Issue Date: 2022
Type: Article
DOI: 10.1016/j.dsr.2022.103897
ISSN: 0967-0637
E-ISSN: 1879-0119
Funder: King Abdullah University of Science and Technology (KAUST), Saudi Arabia
SUMMER project within the EU Horizon 2020 research and innovation programme [817806]
H2020 Societal Challenges Programme [817806] Funding Source: H2020 Societal Challenges Programme
Appears in Publication types:Artículos científicos

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