You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Impact of Double-Crested Cormorants on the Mississippi Delta Catfish Industry: A Bioenergetics Model
James F. Glahn and Kristin E. Brugger
Vol. 18, Special Publication 1: The Double-Crested Cormorant: Biology, Conservation and Management (1995), pp. 168-175
Published by: Waterbird Society
Stable URL: http://www.jstor.org/stable/1521537
Page Count: 8
You can always find the topics here!Topics: Catfish, Waterfowl, Predation, Food demand, Fish culture, Agroecology, Population estimates, Ponds, Replacement value, Diet
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
A bioenergetics model was constructed and evaluated for estimating Double-crested Cormorant (Phalacrocorax auritus) energy expenditures, food demand and impact on the Channel Catfish (Ictalurus punctatus) industry in the Delta region of Mississippi. Large body mass (mean = 2.27 kg) and higher basal metabolism (115% to 128% of predicted) resulted in an average predicted food demand of 504 g/bird/day (range: 449 to 551) from November to March or 22% of body mass. Factoring in population sizes and proportional intake of catfish, Double-crested Cormorants may have eaten up to 20 million catfish per winter in 1989-90 and 1990-91 or approximately 4% of the estimated standing crop at a replacement cost of $2 million (US$) annually. More than 50% of catfish losses were projected to occur in February and March; negligible losses occurred in November.
Colonial Waterbirds © 1995 Waterbird Society