Multi-frequency and light-avoiding characteristics of deep acoustic layers in the North Atlantic.

Abstract:

:This study aimed to add light-avoidance as a categorizing technique for the study of mesopelagic acoustic layers. Data recorded along the 20° W parallel from 20° N to Iceland showed three types of mesopelagic layers: the non-avoiding non-migrant deep scattering layer (NMDSL), which dropped its intensity toward the north, the avoiding migrating fish layers (MDSL), which were more intense at upwelling areas and toward the north, and a secondary deeper NMDSL at the southern part. Light avoidance was only discernible at 18 kHz within the main NMDSL when this layer was intense, suggesting that migrants are barely seen at 38 kHz when other resonant scatterers occupy these depths. These results highlight the importance of employing the 18 kHz frequency from a vessel borne echosounder or lowered echosounders attached to a probe to study gas-bearing migrants.

journal_name

Mar Environ Res

authors

Peña M,Cabrera-Gámez J,Domínguez-Brito AC

doi

10.1016/j.marenvres.2019.104842

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

104842

eissn

0141-1136

issn

1879-0291

pii

S0141-1136(19)30462-3

journal_volume

154

pub_type

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