This is a survey of the standing crop of plankton in the Florida Current, its vertical, seasonal and diurnal changes, and of relevant environmental conditions. The top 100 meters is considered to be the euphotic zone. Most of the phytoplankton is nannoplankton and is concentrated in
the euphotic zone, where it shows some seasonal change. Zooplankton also show a small seasonal change and a marked diurnal migration in the euphotic zone. Details are given for siphonophores, chaetognaths, copepods, euphausids, pteropods and young fish. There is some seasonal fluctuation in
the total phosphorus content of the euphotic zone, and most of the phosphorus is in the form of dissolved organic matter. A smaller fraction comprises live nannoplankton and detritus, and a very small fraction is due to zooplankton. Both the inorganic phosphorus and inorganic nitrogen are
extremely deficient at all times in the euphotic zone.
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