American Shad Riverine Habitat Requirements

Field evaluations of existing habitat suitability index (HSI) models for spawning adults, eggs, and larvae of American shad (Alosa sapidissima) were conducted in 1990-1992; initial models for juveniles in nursery habitats were developed. Fish abundance in various habitats of the upper Delaware River was quantified by (1) observation of adult spawning activity, (2) collection of eggs and larvae with metered plankton and drift nets, and (3) enumeration of juveniles by underwater observation and seining techniques. Regression analysis, principal component analysis, and range analysis were used to relate abundance to an array of physical habitat variables potentially influencing fish distributions. No HSI model was previously developed for juvenile American shad in riverine habitats. Four physical habitat variables were correlated with juvenile abundance: water temperature, dissolved oxygen (covariates), river depth, and turbidity. Regression analysis, principal component analysis, and range analysis were used to relate abundance to an array of physical habitat variables potentially influencing fish distributions. The Research and Development Laboratory-Wellsboro (RDL-W) is located on 55 acres near Wellsboro, Pennsylvania (Tioga County). Laboratory facilities include 3 modern buildings, 8x200-foot concrete raceways, 3 production wells, and support equipment. Core Capabilities The RDL-W conducts research for restoration of depleted fisheries and other aquatic biological resources. A diversified research program in ecology, conservation technology, genetics, and physiology emphases the integration of laboratory and field studies to develop scientifically sound approaches to the management of aquatic ecosystems. Research is directed primarily towards development of information and technology to increase understanding of aquatic ecosystems in the northeastern United States and to assist client agencies to better manage these ecosystems and their biota. Technical assistance is provided to clients throughout the nation.