Rates of egg production by the copepod Calanus marshallae in the laboratory and in the sea off Oregon, USA

Abstract

Egg production by adult female Calanus marshallae Frost was studied in the laboratory by making a census of the number of eggs produced each day by individuals maintained on a diet of the diatom Thalassiosira weissflogii. When fed ad libitum individuals produced a clutch of 30 eggs every 30 h on average. Egg production rates were influenced by food concentration, ranging from 0 d⁻ ¹ when females were kept in filtered seawater up to 24 ...