Preying on commercial fisheries and accumulating paralytic shellfish toxins: a dietary analysis of invasive Dosidicus gigas (Cephalopoda Ommastrephidae) stranded in Pacific Canada |
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| Authors: | Heather Elizabeth Braid Jonathan Deeds Stacey Lea DeGrasse John James Wilson Josephine Osborne Robert Harland Hanner |
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| Institution: | (1) Department of Integrative Biology, University of Guelph, 50 Stone Rd. East1, Guelph, ON, N1G 2W1, Canada;(2) US FDA Center for Food Safety and Applied Nutrition, 5100 Paint Branch Parkway, College Park, MD 20740, USA;(3) Raincoast Education Society, Tofino, BC, V0R 2Z0, Canada;(4) Present address: The Earth and Oceanic Sciences Research Institute, School of Applied Sciences, Auckland University of Technology, Auckland City, 1010, New Zealand |
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| Abstract: | In fall of 2009, several mass strandings of Humboldt squid (Dosidicus gigas) occurred on Vancouver Island (49°7′60N 125°54′0W). Morphological dissections coupled with DNA barcoding of stomach contents
revealed Sardinops sagax (Pacific sardine) and Clupea pallasii (Pacific herring) as their primary prey. Plastic nurdles, fishing line, bull kelp, eelgrass, and a guillemot feather were
also discovered. The primary prey, Pacific sardines and Pacific herring, are known to bioaccumulate paralytic shellfish toxins
(PSTs); additionally, both PSTs and domoic acid (DA) have been implicated in other mass strandings. Therefore, stomach contents,
and other tissues when possible, were tested for PSTs and DA. Testing revealed DA concentrations below regulatory guidance
levels for human consumption, yet PSTs were well in excess. Though we cannot conclude that PSTs were the definitive cause
of the strandings, our findings are the first report of PSTs in D. gigas. |
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