Assessment of predation at trout hatcheries in central Pennsylvania

J. A. Parkhurst, R. P. Brooks, D. E. Arnold

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The authors identified seven important predators at ten trout hatcheries and quantified their foraging behaviors. Most species devoted <28% of their total time in a hatchery to foraging for fish. As a group, predators fed on fish of variable lengths, but many factors determined specific lengths of fish taken. Most predators foraged equally at earthen and concrete raceways, but great blue herons Ardea herodias foraged only at earthen raceways. Collectively, common grackles Quiscalus quiscula captured and removed the most fish/day, but because mallards Anas platyrhynchos were present for more days/year, they had the greatest total impact. Secondary infection and injuries sustained during attacks by predators also may be important factors in fish loss. -from Authors

Original languageEnglish (US)
Pages (from-to)411-419
Number of pages9
JournalWildlife Society Bulletin
Issue number4
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Nature and Landscape Conservation


Dive into the research topics of 'Assessment of predation at trout hatcheries in central Pennsylvania'. Together they form a unique fingerprint.

Cite this