In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2550-2550
Abstract:
The Humboldt squid, Dosidicus gigas, is a voracious migratory predator, important prey for many species, and the target of an economically important fishery. However, information on the behavior, life history, and biomass of this species is limited. Current knowledge is based almost exclusively on fisheries records, which only contain nighttime observations and provide no information on squid distribution and behavior outside of heavily fished areas. Acoustic measurements have long been used to study fish. Development of this method for application to squid provides a noninvasive technique to assess squid numbers and sizes. This method was applied in March and April of 2007 and November of 2008 in the Gulf of California, with a focus on the Santa Rosalia region. Squid densities were as high as 25 000 per km3. Larger numbers of squid were observed at shelf breaks relative to other areas. Squid exhibited a marked diel vertical migration, with daytime depths of 300–400 m, bathymetry allowing, and nighttime depths of 0–200 m. In shallower coastal areas, the distribution of squid closely mirrored the shape of the bottom topography. This new technique is providing previously unattainable insights into the behavior and biology of this commercially and ecologically important squid species.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2009
detail.hit.zdb_id:
1461063-2
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