00000nam 2200000zi 4500 9.950331 CaOODSP 20250528082808 m o d f cr mn||||||||| 250423e198108##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x7x8 Fs97-4/1618E-PDF Fs97-4/1618 Adkins, B. E., author. A survey of commercial sea urchin (Strongylocentrotus franciscanus) populations in the Gulf Islands, November 1980 / by B.E. Adkins, R.M. Harbo, and P.A. Breen. Nanaimo, British Columbia : Department of Fisheries and Oceans, Resource Services Branch, Pacific Biological Station, August 1981. ©1981 1 online resource (iii, 41 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; no. 1618 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (page 6). "Divers surveyed the abundance of red sea urchins, which are commercially harvested for their gonads, at 48 sites. Sea urchins were abundant enough to count in quadrats at 27 sites. The total standing stock of sea urchins available to the fishery in the southern Gulf Islands area was estimated by calculating mean sea urchin density in beds dense enough to support harvesting, and multiplying this by the total length of shoreline supporting commercial sea urchin beds. The standing stock was estimated to be 2600 t. Recruitment of juveniles (defined on the basis of size) was only 5.5% of the total population, indicating that turnover rate is very low. Quotas were therefore recommended for this area"--Abstract, page iii. Includes abstracts in English and French. Red sea urchin British Columbia Gulf Islands. Sea urchin populations British Columbia Gulf Islands. Invertebrate surveys British Columbia Gulf Islands. Oursin rouge Colombie-Britannique Gulf, Îles. Oursins Populations Colombie-Britannique Gulf, Îles. Invertébrés Inventaires Colombie-Britannique Gulf, Îles. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; no. 1618. (CaOODSP)9.505211 PDF 538 KB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1618-eng.pdf