Browsing by Subject "fish"
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Item Annual Catch of Yellow Perch from Red Lakes, Minnesota, in Relation to Growth Rate and Fishing Effort(Minnesota Agricultural Experiment Station, 1971) Heyerdahl, Eugene G.; Smith, Lloyd L.Item Behavioral differences in sound detection in recently diverged cave and surface forms of Astyanax mexicanus(2021) Kistner, Amanda R; Enriquez, Maya S; Michels, Noland O; Mensinger, Allen FAstyanax mexicanus, or the Mexican tetra, inhabits both surface streams and cave systems, and has subsequently developed two unique morphologies: a cave morph and a surface morph. Cave morphs of the species have evolved several troglomorphic phenotypes, including vestigial eyes, reduced pigmentation, and increased olfactory and lateral line sensitivity. Interestingly, several satellite populations of surface fish were introduced to a Texas aquifer approximately 100 years ago and, following cave colonization, rapid evolution of various sensory adaptations between the cave and surface populations have been observed. Auditory evoked potential (AEP) data was collected to compare hearing sensitivities between cave and surface satellite populations, and both populations responded to sound presentation up to 4 kHz. However, because AEPs measure action potential summation to screen for frequency sensitivities, behavioral data is needed to determine absolute hearing sensitivity. The current study examines behavioral differences in sound detection between these two populations using reflexive startle behaviors to sound, namely the “C-start” escape response, which has been shown to be a reliable means of determining neurological responses to acoustic stimuli. Based on behavioral audiograms collected on satellite three populations, San Pedro Springs (cave) and Honey Creek (surface) appear to respond more readily to acoustic stimuli and habituate at a similar rate when compared to San Antonio Zoo (surface), which appear to respond less readily and habituate faster. Differences in sound pressure thresholds, as well as stimulus-response latencies between these populations, will be determined through finer volume control and modeling sub-thresholds.Item Data in support of: Quantifying resilience of coldwater habitat to climate and land use change to prioritize watershed conservation(2021-08-06) Hansen, Gretchen JA; Wehrly, Kevin E; Vitense, Kelsey; Walsh, Jacob R; Jacobson, Peter C; ghansen@umn.edu; Hansen, Gretchen; University of Minnesota Department of Fisheries, Wildlife, Conservation Biology; Minnesota Department of Natural Resources; Michigan Department of Natural ResourcesData for 12,450 lakes in the Upper Midwestern United States used to predict coldwater, oxygenated habitat and how it is predicted to change under scenarios of climate and land use change. Specific fields include lake size, depth, watershed landuse, air temperature characteristics, and presence of the coldwater fish Cisco (Coregonus artedi). Also included are projected air temperatures under mid-Century conditions for each lake.Item Dietary Niche and Growth Rate of the Nonnative Tubenose Goby (Proterorhinus semilunaris)(2019-05) Dawson , BradleyBasic life history knowledge is essential to determine if a nonnative species is potentially invasive. The nonnative tubenose goby (Proterorhinus semilunaris) arrived in the Great Lakes in the 1990s via ship ballast water, but remains poorly studied within North America, making it difficult to predict its effects on native ecosystems. Diet and growth patterns were examined from age-0 tubenose gobies within the estuary of the St. Louis River, a tributary to Lake Superior near Duluth, Minnesota. Dietary breadth and growth rates have important ramifications for survival, competitiveness, and dispersal ability of a fish species, influencing its potential success as an invasive species. I sampled tubenose gobies from shallow vegetated habitat via beach seine during summer and fall periods, and removed otoliths and aged fish on daily increments for growth modelling. Furthermore, stomach contents were identified and weighed to provide measures of fitness and dietary breadth between seasons (fall vs. summer) and between several locations within the estuary. Results suggest a low dietary breadth that overlaps with tadpole madtom (Noturus gyrinus); tubenose goby diet was mostly comprised of Crustacea, regardless of location or season. Growth modelling demonstrates that tubenose gobies reach a small maximum size and are short-lived, indicating an r-selected life history. The Gompertz function is preferred for modelling the growth of this species.Item Effects of Agricultural Drainage on Aquatic Ecosystems: A Review(2009) Blann, Kristen, L.; Anderson, James, L.; Sands, Gary, R.; Vondracek, BruceItem Fishery Resources for Lake of the Woods, Minnesota(Minnesota Agricultural Experiment Station, 1972) Heyerdahl, Eugene G.; Smith, Lloyd L.Item Implications of community concordance for assessing stream integrity at three nested spatial scales in Minnesota, USA(2011) Dolph, Christine, L.; Huff, David, D.; Chizinski, Christopher, J.; Vondracek, BruceItem Microhabitat influence on young-of-year fish assemblages within the vegetated beds of the St. Louis River estuary(2017-07) Ramage, HannahCoastal wetlands within the Laurentian Great Lakes provide crucial habitat for an abundance and diversity of fishes during larval and juveniles stages; however, young-of-year fish habitat association studies at the microhabitat scale are rare. Because studies at this fine scale are crucial for understanding the habitat properties that support fishes at this critical life stage, I examined larval and juvenile fish assemblage structure in relation to microhabitat variables within the St. Louis River estuary, a drowned river mouth of Lake Superior. Fish were sampled in aquatic vegetated beds throughout the estuary, across a gradient of aquatic vegetation types and densities. Canonical correspondence analysis, relating species abundances to environmental variables revealed that principally microhabitat variables, including plant species richness, depth, and aquatic plant cover explained difference in fish assemblages. In addition, I evaluated the specific habitat associations of non-native Tubenose Goby (Proterorhinus semilunaris) to provide insight on habitat overlap with native species and further invasion risk. Tubenose Goby were nearly ubiquitous (75% if study sites) and abundant (0.59 fish/m2) in the study site. Non-metric multidimensional scaling revealed that sunfish, Tadpole Madtom and Johnny Darter have the most potential for habitat overlap with Tubenose Goby. Generalized linear modelling revealed that Tubenose Goby occupied a specific microhabitat within vegetated beds consisting of dense cover and high plant species richness. Results from this microhabitat analysis at this critical life stage has potential to inform wetland management and restoration efforts within the St. Louis River estuary and other Great Lake Coastal Wetlands.Item Results of Pre-Treatment Habitat and Biota Surveys from the Knife River, MN below County Road 11(University of Minnesota Duluth, 2022-12) Dumke, Josh; Wellard-Kelly, HollyThis report follows the same layout and data summaries as reports provided to the Lake Superior Steelhead Association (LSSA) in recent years (Dumke and Wellard-Kelly, 2017, 2018). … The Natural Resources Research Institute (NRRI) was contracted in 2021 by LSSA to conduct pre-treatment stream surveys of habitat, fish, macroinvertebrates, and water chemistry from a segment of the Knife River main stem below County Road 11, which is planned to receive habitat improvement work in the future. We also measured all the same parameters in another reach not expected to undergo any treatment to serve as a reference for later comparisons. This before-after, control-impact (BACI) design is our standard for attributing changes over time to specific treatments applied to the stream and is useful in evaluating changes caused by habitat improvement projects. In total, two river reaches (a treatment and a reference station) were surveyed by NRRI. In September of 2021 NRRI completed surveys of stream habitat, macroinvertebrates, and water chemistry within both reaches, and completed electrofishing within the reference reach. However, the electrofishing of the treatment reach could not be completed in 2021 due to a combination of rain events causing high flows, upstream construction causing muddy water, and a September 15th stop on electrofishing to protect fall-spawning Brook Trout Salvelinus fontinalis. Therefore, NRRI and LSSA agreed to extend the work contract and NRRI would re-survey fish at the end of June 2022 before new stream construction projects would begin again. We found that all reaches had water quality parameters acceptable for all salmonid species present in the Knife River watershed, at least at the times of our sampling. Among all our fish surveys we collected young-of-year (YOY, aka age0) and age1+ Rainbow Trout Oncorhynchus mykiss, Brown Trout Salmo trutta, and Brook Trout. Our September 2021 survey of the reference reach captured 67 age0 Rainbow Trout, so we know Rainbow Trout are using this area for some reproduction. Electrofishing surveys in June 2022 captured only 1 age0 Rainbow Trout, but the low capture during these surveys may be attributable to the early timing when age0 Rainbow Trout were still too small to be effectively sampled. However, both stream reaches were dominated by non-game fishes, and the total count of trout species contributed less than 10% to the fish assemblage. Macroinvertebrate communities were generally similar between the reference and treatment reaches, but the treatment reach had a slightly higher quality macroinvertebrate assemblage. Reference and treatment reaches both had occurrences of bank erosion, fine sediment comprised on average 30-40% of the stream bed, and coarse substrates were, on average, 20-30% embedded by fines. All of these things contribute to loss of living space among the stream rocks for aquatic macroinvertebrates.Item A Synoptic Study of Food Habits of 30 Fish Species from Western Lake Superior(Minnesota Agricultural Experiment Station, 1971) Anderson, Emory D.; Smith, Lloyd L.