Developing a head mounted RFID reader to detect salmon smolt consumption with a wild harbour seal
Presentation Abstract
Estimating predation rates on juvenile salmonids is challenging due to the scarcity of reliable data. Opportunities to address the data gap now exist as new sensors are incorporated into telemetry packages that can be deployed across the Salish Sea. Here we report on the development of a field ready sampling scheme for a novel, head-mounted radio frequency identification (RFID) reader designed to detect tagged juvenile salmon as they are consumed by pinnipeds. Feeding trials were conducted in a controlled setting over 8 weeks with a wild-caught harbor seal (Phoca vitulina) and live coho salmon smolts (Oncorhynchus kisutch) carrying passive integrated transponder (PIT) tags. We calculated the passage rates of 4 PIT tag types to maximize fish detections and explored smart sub-sampling techniques to minimize costly RFID field power consumption by logging PIT IDs (8 Hz) and measuring head-strike acceleration (250 Hz) during prey capture attempts. Analyses of the archival instrument revealed that 100% of consumed smolts were detected (n = 505), that time in the RFID field was unrelated to smolt length (R2 < 0.20), and that passage rates were significantly different for each PIT tag class (F3, 501 = 317, p <0.001). Notably, PITs were detected for significantly shorter durations (means < 0.35 sec) during unsuccessful captures (n = 200, p < 0.001) suggesting that false positives may be easily screened from field data. By recording prey capture attempts in a laboratory setting, we developed a behavior based sampling scheme that would significantly extended future field deployments while maximizing the likelihood of detecting consumption of juvenile salmon. We also demonstrated that acceleration based triggers could be useful to activate a variety of on-board sensors or to moderate sampling rates for instrumented free-ranging marine predators.
Session Title
The Salish Sea Marine Survival Project- Novel Approaches, Project Status and Key Findings
Conference Track
Species and Food Webs
Conference Name
Salish Sea Ecosystem Conference (2016 : Vancouver, B.C.)
Document Type
Event
Start Date
2016 12:00 AM
End Date
2016 12:00 AM
Location
2016SSEC
Type of Presentation
Oral
Genre/Form
conference proceedings; presentations (communicative events)
Contributing Repository
Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.
Subjects – Topical (LCSH)
Salmonidae--Predators of--Salish Sea (B.C. and Wash.); Harbor seal--Food--Salish Sea (B.C. and Wash.); Salmonidae--Effect of predation on--Salish Sea (B.C. and Wash.); Predation (Biology)--Research
Geographic Coverage
Salish Sea (B.C. and Wash.)
Rights
This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.
Type
Text
Language
English
Format
application/pdf
Developing a head mounted RFID reader to detect salmon smolt consumption with a wild harbour seal
2016SSEC
Estimating predation rates on juvenile salmonids is challenging due to the scarcity of reliable data. Opportunities to address the data gap now exist as new sensors are incorporated into telemetry packages that can be deployed across the Salish Sea. Here we report on the development of a field ready sampling scheme for a novel, head-mounted radio frequency identification (RFID) reader designed to detect tagged juvenile salmon as they are consumed by pinnipeds. Feeding trials were conducted in a controlled setting over 8 weeks with a wild-caught harbor seal (Phoca vitulina) and live coho salmon smolts (Oncorhynchus kisutch) carrying passive integrated transponder (PIT) tags. We calculated the passage rates of 4 PIT tag types to maximize fish detections and explored smart sub-sampling techniques to minimize costly RFID field power consumption by logging PIT IDs (8 Hz) and measuring head-strike acceleration (250 Hz) during prey capture attempts. Analyses of the archival instrument revealed that 100% of consumed smolts were detected (n = 505), that time in the RFID field was unrelated to smolt length (R2 < 0.20), and that passage rates were significantly different for each PIT tag class (F3, 501 = 317, p <0.001). Notably, PITs were detected for significantly shorter durations (means < 0.35 sec) during unsuccessful captures (n = 200, p < 0.001) suggesting that false positives may be easily screened from field data. By recording prey capture attempts in a laboratory setting, we developed a behavior based sampling scheme that would significantly extended future field deployments while maximizing the likelihood of detecting consumption of juvenile salmon. We also demonstrated that acceleration based triggers could be useful to activate a variety of on-board sensors or to moderate sampling rates for instrumented free-ranging marine predators.
Comments
Speed talk preferred