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 Resjournal_title
Marine environmental researchauthors
Peña M,Cabrera-Gámez J,Domínguez-Brito ACdoi
10.1016/j.marenvres.2019.104842subject
Has Abstractpub_date
2020-02-01 00:00:00pages
104842eissn
0141-1136issn
1879-0291pii
S0141-1136(19)30462-3journal_volume
154pub_type
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