ABSTRACT. Growth production of the euphausiid Nyctiphanes sirnplex Hansen was examined off the southwest coast of the peninsula of Baja California, Mexico (Bahia Magdalena, 24 to 25" N ) , as a function of seasonal changes of temperature, zooplankton biomass, upwelling index, and regional ocean circulation. The data were collected during 4 oceanographic surveys from June to November 1986. High densities of N. sirnplex were found in the shallow coastal waters (c300 m). High production is maintained during late spring and summer, decreasing during autumn when stratification of the water column develops. We estimate the production attributable to growth of N. sirnplex on the coastal shelf was 273.42 mg m-? yr.' and showed a strong seasonal variation. This value was about '4 the value previously reported at
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