Browsing by Author "Feely, Jane"
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Item The Ability Of A Cyclic Sound On Its Own, And When Coupled With An Air Curtain, To Block Ten Species Of Fish Including Carp In A Laboratory Flume(2020-05) Feely, JaneThere is a critical need to stop the upstream movement of invasive Asian carps in the Mississippi River. One strategy to stop this would be to install sensory deterrent systems in navigation locks. Because carps have excellent hearing, sound is being considered. My thesis examined the ability of sound and sound coupled with air to block a range of fish species, including four species of carp, in the laboratory. Responses to sound alone did not appear to be related to the possession of hearing specializations. In particular, silver and grass carp were relatively unaffected. Coupling this sound with an air curtain increased its efficacy at repelling all fish species and generally corresponded with the presence of hearing specializations. This laboratory study suggests that although a cyclic sound has little potential to block all carp species, coupling the sound to an air curtain has greater potential with little species-specificity.Item An ensonified bubble curtain blocks 4 species of invasive carp in a laboratory flume but also deters other fish, while sound alone is less effective overall and does not target carp(2022-03-18) Feely, Jane; Sorensen, Peter; feely033@umn.edu; Feely, Jane; University of Minnesota - Minnesota Aquatic Invasive Species Research CenterFour species of invasive carp from Asia are advancing up the Mississippi River through its locks and dams (LDs) and threatening to profoundly alter its ecosystems. It has been hypothesized that sensory stimuli could be projected into locks to block carp movement through LDs. Sound has garnered special attention because carp are members of Ostariophysi, a group of fish with an exceptional sense of hearing. Further, it has been found that a broadband cyclic sound is especially effective at blocking bighead and common carp and that when projected into an air curtain to create an ensonified bubble curtain (EBC), blockage rates for these species exceed 90%. However, whether an EBC might especially effective at blocking all carps, and what its effects might be on native non-ostariphysians and why, has not been addressed. To answer these questions, this study examined the responses of 10 fishes including 4 invasive carps (common, bighead, silver, grass), 2 native Ostariophysi (channel catfish, golden shiners), and 4 native non-ostariophysians (rainbow trout, largemouth bass, bluegill sunfish, lake sturgeon) in a darkened laboratory flume while either a cyclic sound was played on its own, or projected into an air curtain. The EBC blocked all 4 carps 92-97% of the time without habituation, but 5 native fish were also partially blocked. In contrast, sound alone only blocked 2 carps and affected the other fishes to varying extents. An EBC appears uniquely well-suited to blocking carp invasions if native fish movement is a secondary concern.