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Clarification of methods used to determine deep sea red crab (Chaceon quinquedens) abundance from data collected during the 1974 photographic survey
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2013
[PDF-2.45 MB]
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Description:"The otter trawl and camera tow stations were distributed randomly within the narrow band (229-1,280 meters in depth) of red crab habitat at the edge of the continental shelf, where the bottom drops off steeply (Figure 3). The survey area was divided into four latitudinal regions with seven depth classes within each latitudinal zone, for a total of 28 subareas or strata. Overall density estimates were means of individual strata weighted by stratum area. Overall, 33 successful camera sled tows and 43 otter trawl tows were made during the survey (Table 1). From the number of crabs counted in t he photographs, Wigley et al. estimated there were 59 million pounds of commercial-sized (in 1974, this was considered >114 mm carapace width) male red crabs in the surveyed area"--Introduction.
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Content Notes:by Antonie Chute, Larry Jacobson and Brian Redding.
"July 2013."
"Web version posted November 22, 2013"--Document home page.
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (page 6).
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Rights Information:Public Domain
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