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Testing the performance of a hydraulic clam dredge modified to capture small animals
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2016
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[PDF-4.85 MB]
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Description:The selectivity of the sampling gear used for the Northeast Fisheries Science Center's clam survey for ocean quahog (Arctica islandica) and Atlantic surfclam (Spisula solidissima) is of particular interest because it is used to infer the abundance of small animals that are not efficiently caught. Small animals inform estimates of recruitment and are important indicators of stock health and productivity. A new selectivity dredge was designed and built in 2014 with the intention of improving the quantity and quality of selectivity experiments typically conducted during survey operations. Initial gear testing indicates that the new dredge will improve selectivity experiments. The new dredge filters unwanted material better than the previous one and can be towed for longer, resulting in a more representative sample of the experimental area. The previous dredge required several hours of shore side labor to prepare, while the new dredge does not. Finally, the size selectivity of the new dredge does not differ substantially from the previous one for Atlantic surfclam, but there are some differences for small and large ocean quahog. [doi:10.7289/V5M043DT (http://dx.doi.org/10.7289/V5M043DT)]
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Content Notes:Daniel R Hennen , Roger Mann , Nicole Charriere , Victor A Nordahl.
"April 2016."
"Web version posted April 8, 2016."
doi:10.7289/V5M043DT (http://dx.doi.org/10.7289/V5M043DT)
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (page 5).
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Rights Information:Public Domain
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