Acknowledgments

This research was a result of the collaborative efforts of my colleagues (Kamazima Lwiza, Bob Cowen), students (Holly Kunze, Andy Matthews, Karl Lobue, Jeff Schell, Jean Anastasia, Kevin Hovel) and the crew of the R/V Onrust (Brett Zielenski, Mark Wiggins). Lynn McMasters and Justin Nevi-ackas assisted with figure preparation. Funding was provided by two grants from the Hudson River Foundation (01091A, 0993A) and one grant from the National Oceanographic and Atmospheric Administration (NA90AA-D-SG078) to the Research Foundation of the State University of New York for the New York Sea Grant Institute. The U. S. Government is authorized to produce and distribute reprints for governmental purposes notwithstanding any copyright notation that may appear hereon. The views expressed herein is the author's and do not necessarily reflect the views of NOAA or any of its subagencies. Contribution Number 2183 from the Bodega Marine Laboratory, University of California at Davis.

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the power industry on the Hudson, a major user of river water and source of fish mortality, will be an important factor influencing fish abundance, including of the anadromous forms.

13 The Diadromous Fish Fauna of the Hudson River: Life Histories, Conservation Concerns, and Research Avenues

John R. Waldman abstract The Hudson River hosts almost a dozen diadromous fishes - species that migrate between marine and fresh waters. Only one, American eel, is catadromous (spawn at sea); the remainder are anadromous (spawn in fresh water). American shad, Atlantic sturgeon, and striped bass have been subjected to large, long-term, commercial fisheries; striped bass also support an intensive recreational fishery. Because of protection afforded the coastal migratory mixed stock of striped bass, the Hudson's population is high at this time. Among Hudson River finfish, only American shad have low enough body burdens of polychlorinated biphenyls (PCBs) to allow commercial harvests today, but this stock has shown a long-term decline. Because of late twentieth century commercial overfishing of the Hudson River Atlantic sturgeon stock and the depleted status of most of its other populations, this species is being conserved under a fishing moratorium that may extend to 2038. The river's other acipenserid, shortnose sturgeon, was one of the original taxa listed under the 1973 U.S. Endangered Species Act; there is evidence that its abundance has multiplied four-fold since then. Marine-migrating blueback herring have colonized the Mohawk River -thus extending their distribution and increasing their abundance in the system. Two cold-water fishes at the southern margin of their ranges have become apparently extinct (rainbow smelt) or have shown declines (Atlantic tomcod) that may be related to warming. Recent studies have increased knowledge of the Hudson's diadromous ichthyofauna, but many questions remain, particularly concerning the effects of non-native species and shifting community compositions. Opportunities exist to mitigate some population declines through habitat enhancement. The future of

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