The biology of Gammarus (Crustacea, Amphipoda) in the northwestern Atlantic. VI. Gammarus tigrinus Sexton

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Gammarus tigrinus is an endemic estuarine species of the northwestern Atlantic found from the St. Lawrence estuary south to Florida. At St. Andrews, N.B., 50% maturity occurs at 6.1 mm in the female. Females produce a series of broods between April and September at which time they enter the resting stage. The oogonia begin to enlarge in February, but are not fertilized until April. The young hatched in the spring probably enter the resting stage in late summer before producing the first brood. The older generation disappears in the summer and the life cycle is annual.