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Predation at Intermountain West Fish Hatcheries
Publication Type: | Journal Article |
Year of Publication: | 1996 |
Authors: | Pitt, WC, Conover, MR |
Journal: | The Journal of Wildlife Management |
Volume: | 60 |
Issue: | 3 |
Date Published: | 1996 |
ISBN Number: | 0022541X |
Keywords: | Ardea, Ardea herodias, Ardeidae, Egretta, Egretta sacra, Laridae, Larus, Larus californicus, Nycticorax, Nycticorax nycticorax, Pandion, Pandion haliaetus, Pandionidae |
Abstract: | During 1993-94, we observed predators and surveyed managers at Intermountain West fish hatcheries to quantify the extent and species responsible for depredation losses. Our field study confirmed hatchery managers' impressions that great blue herons (Ardea herodias), black-crowned night herons (Nycticorax nycticorax), ospreys (Pandion haliaetus), and California gulls (Larus californicus) were the most important predators. At 2 intensively monitored hatcheries, we calculated losses to avian predation to be 7.0 and 0.6% of annual production, in contrast to the managers' estimates of 15% at each hatchery. Feeding mostly on dead or moribund fish, feral cats (Felis catus), raccoons (Procyon lotor), and striped skunks (Mephitis mephitis) had little effect on fish production. Private hatchery managers estimated higher (13%) total depredation losses than did managers of state owned hatcheries (5%). Hatchery managers viewed netting to be the only effective nonlethal control measure. |
URL: | http://www.jstor.org/stable/3802080 |
Short Title: | The Journal of Wildlife Management |
Taxonomic name:
Ardea (Birds),
Ardeidae (Birds),
Egretta (Birds),
Egretta sacra (Birds),
Laridae (Birds),
Larus (Birds),
Nycticorax (Birds),
Nycticorax nycticorax (Birds),
Pandion (Birds),
Pandion haliaetus (Birds),
Pandionidae (Birds)
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith