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PRODUCTION OF THE EUPHAUSIID NYCTIPHANES SIMPLEX IN VIZCAINO BAY, WESTERN BAJA CALIFORNIA

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image of Journal of Crustacean Biology

ABSTRACT Production of the euphausiid Nyctiphanes simplex Hansen in Vizcaino Bay was 1,736 mg m-2 yr-1 as determined from size-class distributions through 9 sampling periods during 1966. The production : biomass (P:B) ratio for this period was 17.0. Production due to growth was 74.7%, exuviae 23.4%, and only 1.9% due to eggs. Most reproduction was in the fall. Maximal recruitment and spawning female aggregations (containing > 50 ind m-2) occurred in September, with a mean batch fecundity per spawner of 46 eggs. Maturation time for the eggs was estimated at 30 days, and 3 spawning events seem to be the usual quota per female. The reproductive pattern during fall in Vizcaino Bay seemed to be related to local eddy development in which adults were retained.

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/content/journals/10.1163/193724095x00451
1995-01-01
2016-12-10

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