Combining fishing and acoustic monitoring data to evaluate the distribution and movements of spotted ratfish <Emphasis Type="Italic">Hydrolagus colliei</Emphasis> |
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Authors: | Email author" target="_blank">Kelly?S?AndrewsEmail author Thomas?P?Quinn |
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Institution: | (1) Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd E, Seattle, WA 98112, USA;(2) School of Aquatic and Fishery Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA |
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Abstract: | Direct and indirect methods have been used to describe patterns of movement of fishes, but few studies have compared these
methods simultaneously. We used 20 years of trawl survey data and 1 year of acoustic telemetry data to evaluate the vertical
and horizontal movement patterns of spotted ratfish Hydrolagus colliei in Puget Sound, WA, USA. Densities of large ratfish (≥30 cm) were higher at the deepest depths trawled (70 m) during daylight
hours, whereas densities were similar across depth zones (to 10 m) at night. Acoustic tracking of ratfish showed distinct
diel patterns of movement and activity level; ratfish moved into shallow, nearshore habitats at night from deeper, offshore
habitats during the day and made ~3 times more moves at night than day in shallow habitats. Broader spatial patterns depended
on where ratfish were tagged: one tag group remained in one general location with few excursions, whereas a second tag group
moved within a 20-km band with some individuals moving >90 km. These data will help inform food web models’ abilities to quantify
interspecific interactions between ratfish and other components of their community. |
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