A5019534951- Aquaculture disease management and microbiota
- Fish Ecology and Management Studies
- Environmental Toxicology and Ecotoxicology
- Pharmaceutical and Antibiotic Environmental Impacts
- Aquaculture Nutrition and Growth
- Environmental DNA in Biodiversity Studies
- Physiological and biochemical adaptations
- Fish Biology and Ecology Studies
- Identification and Quantification in Food
- Microbial infections and disease research
- Aquatic Invertebrate Ecology and Behavior
- Reproductive biology and impacts on aquatic species
- Antibiotics Pharmacokinetics and Efficacy
- Parasite Biology and Host Interactions
- Toxic Organic Pollutants Impact
- Underwater Acoustics Research
- Ocean Acidification Effects and Responses
- Marine animal studies overview
- Marine and fisheries research
- Animal Behavior and Welfare Studies
- Biosensors and Analytical Detection
- Insect and Pesticide Research
- Per- and polyfluoroalkyl substances research
- Fish biology, ecology, and behavior
- Forensic Fingerprint Detection Methods
United States Geological Survey
2014-2025
Upper Midwest Environmental Sciences Center
2013-2023
Pacific Island Ecosystems Research Center
2015
United States Department of the Interior
2000-2014
Yankton Rural Area Health Education Center
1996
University of South Dakota
1996
The prevention of non-indigenous aquatic invasive species spreading into new areas is a goal many resource managers. New techniques have been developed to survey for that are difficult capture with conventional gears involve the detection their DNA in water samples (eDNA). This technique currently used track invasion bigheaded carps (silver carp and bighead carp; Hypophthalmichthys molitrix H. nobilis) Chicago Area Waterway System Upper Mississippi River. In both systems has detected from...
Natural resource agencies have established surveillance programs which use environmental DNA (eDNA) for the early detection of bighead carp Hypophthalmichthys nobilis and silver molitrix before they establish populations within Great Lakes. This molecular monitoring technique must be highly accurate precise confident interpretation also efficient, both in threshold cost. Therefore, we compared two extraction techniques a new quantitative PCR (qPCR) assay with conventional (cPCR) used by...
Abstract Nonnative bigheaded carps are established in the Mississippi River and there is substantial concern about their potential entry into interconnected Laurentian Great Lakes. While electrical barriers currently exist as a preventative measure, need for additional control mechanisms to promote barrier security through redundancy. We tested effectiveness of infused carbon dioxide gas (CO 2 ) tool influence movement behavior invasive carps, namely Bighead Carp Hypophthalmichthys nobilis...
The safety of Aquaflor ® (50% w/w florfenicol [FFC]) incorporated in feed then administered to tilapia for 20 days (2× the recommended duration) at 0, 15, 45, or 75 mg/kg body weight/day (0, 1, 3, 5× dose 15 mg FFC/kg BW/d) was investigated. Mortality, behavioral change, consumption, size, and gross microscopic lesions were determined. Estimated delivered doses >96.9% target. Three unscheduled mortalities occurred but considered incidental since FFC-related findings not identified. Feed...
Abstract The effectiveness of an acoustic barrier to deter the movement silver carp, Hypophthalmichthys molitrix (Valenciennes ) and bighead H. nobilis (Richardson) was evaluated. A pond (10 m × 5 1.2 m) divided in half by a concrete‐block with channel (1 across) allowing fish access each side. Underwater speakers were placed on side opening, outboard motor noise (broadband sound; 0.06–10 kHz) broadcast repel carp that approached within 1 channel. Broadband sound effective at reducing number...
The efficacy of hydrogen peroxide to control external parasitic infestations on juvenile (10–33-g) rainbow trout Oncorhynchus mykiss was evaluated in three clinical field trials. Fish were exposed concentrations ranging from 0 560 mg/L for 30 min once every other day a total treatments. Pre- and posttreatment skin scrapes gill wet mounts test fish microscopically examined identify enumerate parasites. Infestation severity classified as nonexistent (0 organisms), low (1–10 moderate (11–20 or...
Assessment in a hydrologically-vulnerable, Mississippi River community revealed cumulative risks from co-occurring inorganic/organic contaminants, including PFAS, alluvial-aquifer-sourced tapwater but not deeper, sandstone-aquifer tapwater.
The freshwater fish Lepomis macrochirus (bluegill) is common to North American waters, and important both ecologically as a sport fish. In 2001 an unknown virus was isolated from bluegills following bluegill kill. This identified picornavirus [termed (BGPV)] diagnostic reverse transcriptase PCR developed. A survey of in Wisconsin waters showed the presence BGPV 5 17 sampled, suggesting widespread populations. Experimental infections confirmed that can cause morbidity mortality bluegills....
Aquaflor, a feed premix containing the broad spectrum antibacterial agent florfenicol (50% w/w), is being developed for use to control enteric septicemia (ESC) in channel catfish Ictalurus punctatus caused by gram-negative enterobacterium Edwardsiella ictaluri. The recommended dose of Aquaflor ESC 10 mg/kg body weight (BW)/day days. study objective was determine safety administered at doses 0 (control), 10, 30, and 50 BW/day 20 consecutive Parameters evaluated included daily mortality,...
Abstract The Bighead Carp Hypophthalmichthys nobilis and Silver H. molitrix are nonnative species that pose a threat to Great Lakes ecosystems should they advance into those areas. Thus, technologies impede Asian carp movement the needed; one potential technology is seismic water gun. We evaluated efficacy of gun array as behavioral deterrent acoustic‐tagged in an experimental pond. Behavioral responses were by using four metrics: (1) fish distance from guns ( D ); (2) spatial area fish's...
Effects of eugenol (AQUI-S®20E, 10% active eugenol) sedation on cool water, yellow perch Perca flavescens (Mitchill), and warm Nile tilapia Oreochromis niloticus L. fish metabolic rates were assessed. Both species exposed to 0, 10, 20 30 mg L−1 using static respirometry. In 17°C water loading densities 60, 120 240 g L−1, controls (0 had 329.6–400.0 O2 kg−1 h−1, while significantly reduced 258.4–325.6 189.1–271.0 h−1 respectively. a rate (424.5 ± 42.3 h−1) relative the 0 control (546.6 53.5...
Abstract Laboratory studies were conducted with five early life stages of rainbow trout, Oncorhynchus mykiss, to determine the acute toxicities fire-fighting chemical formulations in standardized soft and hard water. Eyed egg, embryo–larvae, swim-up fry, 60- 90-d posthatch juveniles exposed three fire retardants (Fire-Trol LCG-R, Fire-Trol GTS-R, Phos-Chek D75-F) two fire-suppressant foams (Phos-Chek WD-881 Silv-Ex). Swim-up fry generally most sensitive stage, whereas eyed-egg was least...
Abstract Hydrogen peroxide treatments of 0, 500, 1,000, and 3,000 μL/L, concentrations that were multiples the Low Regulatory Priority limit 500 administered for 15 min every weekday (Monday–Friday) to eggs rainbow trout Oncorhynchus mykiss steelhead (anadromous trout) determine margin safety existing standard egg treatments. All untreated treated remained free fungal infection throughout incubation. treatment reduced mean percent hatch by 1.4–5.9% among those at 6.8–15.4% 1,000 13.2–25.3%...
Abstract We compared the efficacy of hydrogen peroxide versus formalin treatments to control fungal infections on eggs lake trout Salvelinus namaycush incubated at a hatchery in Wisconsin. Four strains were six vertical-flow Heath incubators; three replicate incubators for each chemical. Each incubator had 13 trays containing approximately 25,000–30,000 eggs/tray. Formalin (1,667 mg/L) or (1,000 administered once daily 15 min up development visible eye spots (eyed egg stage). Eyed and dead...