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The bluef~sh Pomatomus saltatnx spawns offshore In cont~nenta l shelf waters and juven ~ l e s mlgrate to near-shore or estuanne waters dunng t h e ~ r flrst growlng season In estuanes of the New York Blght d u r ~ n g 1987 and 1988 young-of-the-year bluef~sh appeared in 2 d~scre te slze groups Otol~th analyses confirmed that the 2 groups originated from d ~ s t ~ n c t sprlng and summer spawnlng penods The spnng-spawned cohort flrst recruited to estuanes In early to m ~ d J u n e . whereas the summer-spawned cohort f~rs t recru~ted In m ~ d d l e to late August In contrast w ~ t h prevlous years when only spnng-spawned f ~ s h were abundant the overall abundance of spnng vs summer cohorts was s ~ m ~ l a r There were however, signlf~cant d~fferences In abundance among bays that depended on cohort Much of t h ~ s v a r ~ a t ~ o n i abundance 1s probabl\ caused by vanation in advect~ve transport of larvae from spawnlng grounds to estuanes Growth patterns dlffered substant~ally between the 2 cohorts Spr~ng-spawned bluef~sh grew slower than summer-spawned blueflsh d u r ~ n g the pre-recruitment oceanlc phase of the early llfe hlstory perhaps because the11 northward transport causes them to encounter lower temperatures d u r ~ n g the larval pe r~od Both cohorts grow rap~d ly after es tuanne recru~tment but spring-spawned blueflsh are much larger than summer-spawned bluef~sh at the onset of fall m~grat lon Overall year-class strength of bluef~sh along the US mid-Atlant~c oast IS a funct~on of the comb~ned recru~tment success of the sprlng and summel cohorts

marine ecology. progress series

Recruitment of young-of-the-year bluefish Pomatomus saltatrix to the New York Bight: variation in abundance and growth of spring- and summer-spawned cohorts