Assessing Overwater Structure-Related Predation on Juvenile Salmon: A Field Study and Protocol for Weighing the Evidence
Conference
·
OSTI ID:1039862
Large overwater structures have often been cited as potential migratory barriers and areas of increased predation for juvenile salmon migrating along shallow shoreline habitats, although conclusive evidence has not been demonstrated to date in situ. To help resolve this issue, Washington State Ferries (WSF) sponsored directed research to determine whether WSF terminals affect predation on juvenile salmon. We used a combination of standardized surveys, stomach content analyses, and new observational technologies to assess fish, avian, and mammal predation on salmon fry at ferry terminals and paired reference sites during periods of pre- (early April) and peak (May) outmigration. We observed no significant aggregation of potential bird or mammal predators at six ferry terminal study sites. Few potential fish predators were documented in SCUBA surveys, beach seines, or with a Dual frequency IDentification SONar (DIDSON) camera at Mukilteo, our single underwater study location. Only one instance of salmon predation by fish (staghorn sculpin ? Leptocottus armatus) was confirmed, and this was at the corresponding reference site. A tiered protocol (Minimum/ Recommended/ Preferred actions) was developed for assessing potential predation at other overwater structures. Likewise, recommendations were developed for incorporating design features into WSF terminal improvement projects that could minimize future impacts.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1039862
- Report Number(s):
- PNNL-SA-37954; WN0219060
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal shock tolerances of six fishes and one invertebrate from the Pacific Northwest
Evaluation of Methods to Increase Light under Large Overwater Structures
Stock-specific spatial overlap among seabird predators and Columbia River juvenile Chinook Salmon suggests a mechanism for predation during early marine residence
Technical Report
·
Thu Sep 01 00:00:00 EDT 1977
·
OSTI ID:7086666
Evaluation of Methods to Increase Light under Large Overwater Structures
Conference
·
Sun Mar 30 23:00:00 EST 2003
·
OSTI ID:985613
Stock-specific spatial overlap among seabird predators and Columbia River juvenile Chinook Salmon suggests a mechanism for predation during early marine residence
Journal Article
·
Mon Dec 30 19:00:00 EST 2024
· Marine and Coastal Fisheries
·
OSTI ID:2484240