Efficiency of pulsed gastric lavage for evaluating fingerling Walleye Sander vitreus diets

dc.contributor.author Blankman, Trevor
dc.contributor.department Natural Resource Ecology and Management
dc.date 2018-02-18T16:48:33.000
dc.date.accessioned 2020-07-07T05:12:00Z
dc.date.available 2020-07-07T05:12:00Z
dc.date.issued 2017-04-11
dc.description.abstract <p>Pulsed gastric lavage (PGL) is a common nonlethal method for sampling fish stomach contents. However, the effectiveness of this method has not been assessed for fingerling Walleye. Our objective was to assess the efficiency of PGL on fingerling Walleye. Stomach contents were extracted from 57 Walleye with PGL. After PGL, Walleye were euthanized and stomachs were removed to check for remaining contents. Stomach contents were preserved in ethanol and identified. PGL recovered an average of 92% of prey items, but failed to remove all stomach contents in 14 of 57 (24%) instances. Recovery rate of fish (78%) was lower than benthic invertebrates (99%) and zooplankton (97%). For stomachs containing fish, PGL removed all portions of consumed fish 67% of the time, whereas scales remained in the stomach 30% of the time, and whole fish remained in the stomach 2% of the time. Total number of prey items removed from individual stomachs was not related to recovery rates for each prey item (e.g., fish, benthic invertebrates, or zooplankton) and Walleye total length was not related to proportion of remaining prey. These results suggest that PGL is an effective nonlethal technique for recovering stomach contents of advanced fingerling Walleye.</p>
dc.identifier archive/lib.dr.iastate.edu/undergradresearch_symposium/2017/presentations/77/
dc.identifier.articleid 1257
dc.identifier.contextkey 10453734
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath undergradresearch_symposium/2017/presentations/77
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/91845
dc.relation.ispartofseries Symposium on Undergraduate Research and Creative Expression
dc.subject.disciplines Aquaculture and Fisheries
dc.title Efficiency of pulsed gastric lavage for evaluating fingerling Walleye Sander vitreus diets
dc.type event
dc.type.genre event
dspace.entity.type Publication
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
relation.isSeriesOfPublication 6730f354-97b8-4408-bad3-7e5c3b2fca9d
thesis.degree.discipline Animal Ecology