Entrainment of shovelnose sturgeon by towboat navigation in the Upper Mississippi River
Version of Record online: 3 JAN 2013
Published 2013. This article is a U.S. Government work and is in the public domain in the USA.
Journal of Applied Ichthyology
Volume 29, Issue 2, pages 316–322, April 2013
How to Cite
Miranda, L. E. and Killgore, K. J. (2013), Entrainment of shovelnose sturgeon by towboat navigation in the Upper Mississippi River. Journal of Applied Ichthyology, 29: 316–322. doi: 10.1111/jai.12132
- Issue online: 12 MAR 2013
- Version of Record online: 3 JAN 2013
- Manuscript Accepted: 5 OCT 2012
- Manuscript Received: 26 AUG 2012
- U.S. Army Corps of Engineers
Estimated number of shovelnose sturgeon Scaphirhynchus platorynchus impacted annually by towboat entrainment in navigation pools of the Upper Mississippi River were compared against estimates of fishery harvest and ambient population densities to evaluate the relevance of entrainment at the population level. Mean number of sturgeon entrained per kilometer of navigation was estimated at 0.02, and mean number entrained annually considering towboat traffic was estimated at 0.38 sturgeon/ha. Losses associated with entrainment were mostly lower than fishery harvest, although differences were not large. The two sources of mortality combined could potentially reduce the mature adult population to a level where it no longer has the reproductive capacity to replenish itself. Thus, through a combination of entrainment and fishing mortality shovelnose sturgeon may be looming near unsustainable population levels. These estimates are preliminary considering the many uncertainties associated with quantifying entrainment and its effects. Additional research is needed not only to derive better estimates, but also to develop options for managing entrainment.