Striped bass scales and life history tales: Elizabeth North UMCES Horn Point Laboratory fish and physics in Chesapeake Bay

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Presentation transcript:

Striped bass scales and life history tales: Elizabeth North UMCES Horn Point Laboratory fish and physics in Chesapeake Bay

Striped bass scales Eggs Size: 1.8 – 3.7 mm Duration: 2 days Distance: 10 km Adults Size: m Duration: 35 years Distance: 1000 km Note: Source for images is listed the first time the image is used.

Life history tales Fish photographs by D. Flescher, downloaded from Fish illustrations from: Lippson, A. J. and R. L. Moran Manual for identification of early developmental stages of fishes of the Potomac River Estuary. Prepared for MD DNR Power Plant Siting Program. PPSP-MP pp. Larvae Juveniles Adults Eggs

Physical conditions affect all life stages Water temperature, salinity, dissolved oxygen concentrations, and currents influence: survival (heat shock, winter mortality) growth rates location, movement, migration

Striped bass distribution

Chesapeake Bay

To understand how physical conditions affect striped bass in Chesapeake Bay, we need to: determine how physical conditions change in Chesapeake Bay identify how striped bass respond to physical conditions

Outline 1.Water temperature 2.Dissolved oxygen

Water Temperature Chesapeake Bay Program Monitoring Data (Click on plot to see animation)

Striped bass and water temperature: lethal limits and optimal ranges Juveniles Adults Stress/Mortality Optimal oCoC oCoC Stress/Mortality Setzler-Hamilton and Hall 1991

Winter: deep water is best habitat

Late summer: often deep water is preferable

Last month: surface waters warming up… (This plot should be updated before giving the presentation)

This week: rockin’ Chesapeake Bay Observing System (This plot should be updated before giving the presentation)

Outline 1.Water temperature 2.Dissolved oxygen

Dissolved Oxygen Chesapeake Bay Program Monitoring Data (Click on plot to see animation)

Physics and biology cause low dissolved oxygen Fall overturn: low stratification, high mixing Spring rainfall: high stratification, low mixing

Physics and biology cause low dissolved oxygen High stratification, low mixing + Warm water temperatures + Crankin’ biology Phytoplankton Bacteria = Low dissolved oxygen

Striped bass and dissolved oxygen concentrations: lethal limits JuvenilesAdults Stress Mortality Preferred Setzler-Hamilton and Hall 1991

Winter: all is good

Late summer: deep water is NOT preferable

Last month: deep water is poor habitat (This plot should be updated before giving the presentation)

Water temperature Dissolved Oxygen Habitat squeeze: high temperatures and low dissolved oxygen August 18-20, 2003

Summary Physical conditions affect all life stages of striped bass Understanding changes to striped bass habitat is important for fisheries management Habitat quality is determined by a suite of physical conditions

Acknowledgements Edward Houde, William Boicourt University of Maryland Center for Environmental Science Literature Cited Setzler-Hamilton, E. M., and L. Hall Jr (1991) Striped bass, Morone saxatilis. In: Funderburk SL, Jordan SJ, Mihursky JA, Riley D (eds) Habitat Requirements for Chesapeake Bay Living Resources. Chesapeake Bay Program, Annapolis, Maryland, p National Science Foundation UMCES

A web-based classroom activity “Where could the stripers be?” based on this talk can be found at:

Regards, Elizabeth W. North Assistant Professor University of Maryland Center for Environmental Science Horn Point Laboratory, P. O. Box 775 Cambridge, MD USA Note to Teachers: If you use this presentation or web-based activity in your classroom, would you please send me an ? I’d like to know if my efforts are applied in the classroom. Also, I would certainly appreciate your comments and suggestions on making the presentation or web-based activity more useful to you.