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- W2009137908 abstract "A major clam fishery in the USA is based on the Atlantic surfclam (Spisula solidissima) and ocean quahog (Arctica islandica). For stock assessment, the National Marine Fisheries Service (NMFS) has conducted surveys of these species with a standardized hydraulic clam dredge since 1980. The sampling procedure has been to tow the dredge for 5 min at 0.77 m/s (i.e., 1.5 kn), which gives a nominal tow distance of 232 m. This indirect calculation does not include any sampling that may take place when the dredge is being set out or retrieved. To get a direct estimate of distance sampled, we placed sensors and a camera on the dredge to monitor bottom contact and towing speed. A total of 70 tows was made in May 1997 across a range of depths, typical of those made during clam surveys, and at a range of tow speeds and scopes (i.e., ratio of tow line length to bottom depth). For each tow, we counted the number of clams captured and estimated the distance sampled based directly on the sensor data. Actual distance sampled per tow was often 1.5–3 times greater than the nominal distance (timed tow), and tow distance increased with water depth. This occurred because the dredge sampled the bottom when it was being set out and hauled back to the ship. Consideration of actual tow distance changed conclusions regarding the effect of scope on catch rate of surfclams. In addition, data on tow distance and catch per tow allowed us to examine the spatial heterogeneity of the two clam species using a negative binomial model. Our findings suggest that estimating tow distances directly can improve estimates of biomass in clam resource surveys." @default.
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- W2009137908 date "2002-03-01" @default.
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- W2009137908 title "Estimation of tow distance and spatial heterogeneity using data from inclinometer sensors: an example using a clam survey dredge" @default.
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- W2009137908 doi "https://doi.org/10.1016/s0165-7836(01)00292-2" @default.
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