Measuring the precision of estimates of total egg production based on plankton surveys |
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| Authors: | Pennington, Michael Berrien, Peter |
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| Affiliation: | 1National Marine Fisheries Service, NOAA, Northeast Fisheries Center, Woods Hole Laboratory Woods Hole, MA 02543 2National Marine Fisheries Service, NOAA, Sandy Hook Laboratory Highlands, NJ 07732, USA |
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| Abstract: | Methods are given to measure the effects of spatial and temporaldifferences in egg production on the precision of estimatesof total seasonal egg production derived from ichythyoplanktonsurveys. The techniques are applied to the results of largescale plankton surveys conducted in 1977 and 1979 off the northeasternUSA. For the three species analyzed (Atlantic mackerel, Scomberscombrus; silver hake, Merluccius bilinearis and yellowtailflounder, Limanda ferruginea). the surveys produced estimatesof total egg production having an average coefficient of variationequal to 31%. Estimates of spawning stock size based on theegg production estimates compared favorably with other independentassessments of stock size. *MARMAP Contribution MED/NEFC 8339. |
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