ADAPTATION,adaptations,alosa,Alosa sapidissima,ALOSA-SAPIDISSIMA,American shad,anadromous,anadromous fish,blueback herring,channel,Connecticut,Connecticut River,density,depth,diel,Distribution,Disturbance,downstream,downstream migration,feeding,Fish,FRESH-WATER,guidance,herring,history,hydroacoustic,hydroacoustics,identification,INSECTS,jumping,juvenile,juveniles,LIFE,life history,LIFE-HISTORIES,life-history,Massachusetts,migration,morphology,movement,movements,night,observation,predator,predators,river,SCHOOLS,season,seaward migration,shad,sonar,spatial,spatial distribution,SPATIAL-DISTRIBUTION,species,survey,Surveys,TARGET STRENGTH,VERTICAL MIGRATION,Water,water depth,