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This presentation was given by Kevin Kumagai, Senior Fisheries Biologist at HTI Hydroacoustic Technology at the American Fisheries Society's Annual Meeting in Little Rock, Arkansas in September 2013.
Acoustic tags can provide information about fish populations. For example, presence/absence of fish. If detections are uniformly spaced to a high level of precision, these detections can assess fish behavior. Example behaviors include: moving toward and away, holding, downstream migration, searching, fish passage, predator avoidance, predation, simultaneous tags, tag defection. The HTI Predation Tag verifies predation via a unique modification in the tag signal while maintaining individual fish ID. It provides a tool to directly measure predation and allows evaluation of behavior-based predation techniques. Currently in testing by CDWR and BOR in 2013 (Afentoulis et al., 2013), it is being field tested in 2014. Being able to monitor predation dynamics, especially as it relates to threatened or endangered species (e.g., salmonids) will provide tremendous insights to better fisheries management.