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Title

Acoustic detection of larval fish aggregations in Galician waters (NW Spain)

AuthorsGarcía Seoane, Eva ; Álvarez-Colombo, Gustavo; Miquel, Joan; Rodríguez, J. M.; Guevara, Carlos; Álvarez, Paula; Saborido-Rey, Fran
KeywordsAcoustics
Fish larvae
Zooplankton
Frequency response
Galician shelf
Issue Date2016
PublisherInter Research
CitationMarine Ecology Progress Series 551: 31-44 (2016)
AbstractAn acoustic study was conducted on the Galician shelf (NW Spain) during late winter 2012 to detect and assess larval fish abundance. An echo sounder operating with 18, 38, 70, 120 and 200 kHz split-beam, hull-mounted transducers was employed. We analysed the acoustic records in order to describe vertical and horizontal distribution patterns of larval fish aggregations. Regressions between acoustic backscattered energy and density of the most abundant species (Micromesistius poutassou) indicated that larvae with a swimbladder incremented notably the acoustic response at 38, 70 and 120 kHz. However, the predicted acoustic resonance at larval size and depth shows that the frequency of 120 kHz was likely ineffective in detecting fish larvae. The contribution of zooplankton (fish larvae excluded) to total scattering was negligible, even at the higher frequencies, except for several groups of fluid-like zooplankton, such as chaetognaths and polychaetes. Horizontal and vertical distributions of acoustic backscattering also indicated that larval fish aggregations can be detected in Galician waters with acoustics and suggest that this technique is a useful tool for overcoming difficulties associated with larval ecology and fish recruitment studies
Description14 páginas, 3 tablas, 7 figuras
Publisher version (URL)http://dx.doi.org/10.3354/meps11712
URIhttp://hdl.handle.net/10261/134174
DOI10.3354/meps11712
ISSN0171-8630
E-ISSN1616-1599
Appears in Collections:(IIM) Artículos
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