00000cam 2200000zi 4500 9.962734 CaOODSP 20260514114052 m o d f cr mn||||||||| 260512t19991999bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x9x9 Fs97-4/2495E-PDF Fs97-4/2495E Campagna, S., author. Density estimates of giant red sea cucumber (Parastichopus californicus) populations, by dive survey, in the Gulf Islands and Jervis Inlet areas, British Columbia, Canada, in November 1997 and January 1998 / by S. Campagna and C.M. Hand. Nanaimo, British Columbia : Fisheries and Oceans Canada, Science Branch, Pacific Region, Pacific Biological Station, 1999. ©1999 1 online resource (viii, 53 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; 2495 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 18-20). "Dive surveys of sea cucumber (Parastichopus californicus) populations were conducted in the fall of 1997 in the Gulf Islands, and during the winter of 1998 in Jervis Inlet, BC, Canada. The Gulf Islands survey was a joint effort between the Department of Fisheries and Oceans (DFO), the Sea Cucumbers Harvesters Association of BC (PSCHA), and the Cowichan Band. The Jervis Inlet survey was completed without First Nations involvement by PSCHA and contracted third party participants. Each survey area constituted approximately 400 km of shoreline. Field methods consisted of counting the number of sea cucumbers in 4-metre wide strip transects, randomly placed within six randomly selected sites in each area. In addition, three smaller sites, measuring 200 m wide each, were intensively surveyed with random and systematic transects, followed by a complete harvest to obtain the true population size. Transect sampling in the Gulf Islands survey produced a mean density estimate of 3.10 +/- 1.15 SE sea cucumbers per meter of shoreline while densities of 9.53 +/- 1.28 were found in the Jervis Inlet survey. Most sea cucumbers were found between 12 and 18 m in the Gulf survey and between 4.5 and 9 m depth (chart datum) for Jervis Inlet. The greatest density in the Gulf Islands survey was found on boulder and cobble substrate, while mixed soft and hard substrate produced the greatest density in Jervis Inlet. For most of the intensive sites, estimates of the actual population size was within 90% of the confidence limits of the mean obtained from random transects. In the medium and low density sites of the Jervis Inlet, however, the population size was underestimated by transect sampling. Eight transects in one site in Jervis Inlet were surveyed twice. Half of these pairs had similar densities while the other half had densities that differed by a factor of as much as 14. The individual site means, however, were not significantly different"--Abstract, page vii. Includes abstracts in English and French. Parastichopus californicus British Columbia Gulf Islands. Parastichopus californicus British Columbia Jervis Inlet. Sea cucumber populations British Columbia Gulf Islands. Sea cucumber populations British Columbia Jervis Inlet. Invertebrate surveys British Columbia Gulf Islands. Invertebrate surveys British Columbia Jervis Inlet. Holothurie du Pacifique Colombie-Britannique Gulf, Îles. Holothurie du Pacifique Colombie-Britannique Jervis, Goulet. Holothuries Populations Colombie-Britannique Gulf, Îles. Holothuries Populations Colombie-Britannique Jervis, Goulet. Invertébrés Inventaires Colombie-Britannique Gulf, Îles. Invertébrés Inventaires Colombie-Britannique Jervis, Goulet. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; 2495. (CaOODSP)9.505211 PDF 2.45 MB https://publications.gc.ca/collections/collection_2026/mpo-dfo/fs97-4/Fs97-4-2495-eng.pdf