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The bluefish Pomatomus saltatrix spawns offshore in continental shelf waters and juveniles migrate to near-shore or estuarine waters during their first growing season. In estuaries of the New York Bight during 1987 and 1988, young-of-the-year bluefish appeared in 2 discrete size groups. Otolith analyses confirmed that the 2 groups originated from distinct spring and summer spawning periods. The spring-spawned cohort first recruited to estuaries in early to mid-June, whereas the summer-spawned cohort first recruited in middle to late August. In contrast with previous years when only spring-spawned fish were abundant, the overall abundance of spring vs summer cohorts was similar. There were, however, significant differences in abundance among bays that depended on cohort. Much of this variation in abundance is probably caused by variation in advective transport of larvae from spawning grounds to estuaries …