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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 5 | PAGES 869-879 | 1984
© Oxford University Press

research-article

Measuring the precision of estimates of total egg production based on plankton surveys*

Michael Pennington1 and Peter Berrien2

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

Received on December 1, 1983; accepted on June 1, 1984

Methods are given to measure the effects of spatial and temporal differences in egg production on the precision of estimates of total seasonal egg production derived from ichythyoplankton surveys. The techniques are applied to the results of large scale plankton surveys conducted in 1977 and 1979 off the northeastern USA. For the three species analyzed (Atlantic mackerel, Scomber scombrus; silver hake, Merluccius bilinearis and yellowtail flounder, Limanda ferruginea). the surveys produced estimates of total egg production having an average coefficient of variation equal to 31%. Estimates of spawning stock size based on the egg production estimates compared favorably with other independent assessments of stock size.

*MARMAP Contribution MED/NEFC 83–39.


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