NEW YORK There are two reasons the Bass Anglers Sportsmen's Society (B.A.S.S.) tournament trail returns to the Upper Hudson River on a regular basis: plentiful smallmouth and largemouth bass. A prime stretch of bass water flows between Poughkeepsie and Hudson. Focus on the mouths of Catskill Creek, Rondout Creek and Esopus Creek. Also fish along the railroad trestles on the east shoreline. Search along here for "suck holes"-the narrow corridors to back bays. Bass hunt these openings, preying on baitfish caught in the bottleneck. As the tides change, the water flows through these smaller openings, pushing baitfish in and out of the main river.