Mysis mixta spawned from December to April in coastal New Hampshire waters. Females outnumbered males throughout all but the earliest dates of the spawning period. Average clutch size was 60 eggs or larvae. Juveniles were hyperbenthic during the day and migrated into the water column at night. Juveniles remained in inshore waters until surface water temperature s exceeded 12 °C, corresponding with the onset of thermal stratification. Juvenile growth was slow through mid-April then increased sharply from late April through June. Less than 5% of the population appeared to live longer than 1 year.
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