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The species is said to breed in the early spring (Clark, 1902). Mead (1898) noted that eggs were frequently laid in aquaria at Woods Hole during the third week in April. Larvae were obtained in tows during the month of May (Bumpus, 1898), and motile sperm are found as late as June.
At St. Andrews, Scotland, the breeding period extends from the beginning of February to the end of April (Masterman, 1902).