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.