Some Chemical Factors Affecting the Early Developmental Stages of Euchaeta japonica (Crustacea: Copepoda: Calanoida) in the Laboratory

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Abstract
Survival of the egg and naupliar stages of Euchaeta japonica Marukawa reared in the laboratory was increased by addition of zinc, cobalt, and a chelating agent (Na2EDTA) to sea water from the natural environment. The increase, however, occurred during varying times of the year. The benefits of each of these three substances as well as the periodicity are discussed.