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PLoS One. 2014 Jul 28;9(7):e103384. doi: 10.1371/journal.pone.0103384. eCollection 2014.

The use of satellite tags to redefine movement patterns of spiny dogfish (Squalus acanthias) along the U.S. east coast: implications for fisheries management.

Author information

1
Marine Science Center, University of New England, Biddeford, Maine, United States of America.
2
National Marine Fisheries Service Mississippi Laboratories, Southeast Fisheries Science Center, Pascagoula, Mississippi, United States of America.
3
National Marine Fisheries Service Auke Bay Laboratories, Alaska Fisheries Science Center, Juneau, Alaska, United States of America.

Abstract

Spiny dogfish (Squalus acanthias) are assumed to be a highly migratory species, making habitual north-south migrations throughout their northwestern Atlantic United States (U.S.) range. Also assumed to be a benthic species, spiny dogfish stock structure is estimated through Northeast Fisheries Science Center (NEFSC) bottom-trawl surveys. Recent anomalies in population trends, including a recent four-fold increase in estimated spawning stock biomass, suggest alternative movement patterns could exist for this shark species. To obtain a better understanding of the horizontal and vertical movement dynamics of this species, Microwave Telemetry pop-up satellite archival X-Tags were attached to forty adult spiny dogfish at the northern (Gulf of Maine) and southern (North Carolina) extents of their core U.S. geographic range. Reconstructed geolocation tracks ranging in lengths from two to 12 months suggest that the seasonal migration patterns appear to be local in nature to each respective northern and southern deployment site, differing from previously published migration paradigms. Differences in distance and direction traveled between seasonal geolocations possibly indicate separate migratory patterns between groups. Kernel utilization distribution models also suggest strong separate core home ranges. Significant differences in seasonal temperature and depths between the two regions further substantiate the possibility of separate regional movement patterns between the two groups. Vertical utilization also suggests distinct diel patterns and that this species may not utilize the benthos as previously thought, potentially decreasing availability to benthic gear.

PMID:
25068584
PMCID:
PMC4113362
DOI:
10.1371/journal.pone.0103384
[Indexed for MEDLINE]
Free PMC Article

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