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Showing 1 to 20 of 79 for “"electrofishing"”.
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Shocking results: assessing the injury rates of fishes from pulsed-DC electrofishing
Electrofishing is one of the most widely used methods to sample fishes in freshwater ecosystems. There was an early consensus that AC electrofishing was more injurious to fishes than DC electrofishing, but this was based on a relatively small number of studies. Since the late 1980’s, many studies …
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Feasibility of Indexing Largemouth Bass Population Density Using Electrofishing Catch Rate and Water Conductivity Measurement
… an index to largemouth bass density using electrofishing catch per unit effort (CPUE, number of stock-length fish captured per hour of night electrofishing) and water conductivity measurements. Petersen population estimates were determined for largemouth bass in 14 small South Dakota …
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Characterizing bias, precision, and sampling efficiency of commonly used electrofishing sampling designs in midwestern lentic systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Refining monitoring practices and applying novel enhancement strategies to populations of threatened diadromous species.
… monitoring for salmonids generally consists of electrofishing surveys to determine juvenile abundance, where accurate population estimates are critical for conservation target-setting. However, the accuracy of some current population monitoring practices remains untested, with many studies also …
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Evaluation of Smallmouth Bass Introductions in South Dakota Lakes
<p>In 1989, electrofishing gear and modified-fyke (trap) nets were used to sample smallmouth bass Micropterus dolomieui during the spring from five lakes of varying environmental characteristics in eastern South Dakota. The\ mean length of smallmouth bass caught by electrofishing was significantly …
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Indexing Walleye Recruitment in Eastern South Dakota Natural Lakes
… South Dakota. For nearly 20 years, fall night electrofishing has been used to monitor age-0 Walleye population parameters, and index future year-class strength in select waters but with limited evaluation. Additionally, knowledge of recruitment patterns and factors that influence those patterns …
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Evaluation of sampling methodologies for assessing fish species richness in ridge and valley streams in Chattanooga, Tennessee
I evaluated the adequacy of different electrofishing approaches for estimating species richness in small Ridge and Valley streams. My study objectives were to determine the effects of the sampling season, reach length, habitat sequences surveyed, and sampling intensity on estimates of fish species …
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Habitat utilization and movement patterns of subadult largemouth bass (Micropterus salmoides) in the Ohio River
Ohio River electrofishing surveys identified embayments as preferred macrohabitat of subadult largemouth bass. Catch rates within macrohabitats were low ranging from 0.00--2.73 subadult bass/hour. Embayment electrofishing CPUE was higher than tributary or main channel except in spring, when …
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Food Habits, Growth, and Production of Young-of-the-Year Walleyes, Stizostedion vitreum vitreum (Mitchell), in a South Dakota Pond
… 2,347 were removed with seines, 1,937 with electrofishing gear, and 111 with trap nets. Seining yielded 287.3 fish per hour of operation, electrofishing yielded 221.4 fish per hour, and trap netting yielded 2.1 fish per hour. Electrofishing had the highest yield per effort of all methods …
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Relative Survival and Growth of Walleye and Saugeye Fingerlings Stocked in South Dakota Small Impoundments
… saugeye (fingerling mark). Spring and fall night electrofishing was used to sample the stocked percids, as well as potential competing species such as largemouth bass Micropterus salmoides. Differences in relative survival (indexed as catch per hour (CPUE] from night electrofishing) and growth …
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Evaluation of Walleye X Sauger Hybrid Introductions in South Dakota Waters
… lakes. Fishes were collected in early fall by electrofishing in both 1992 and 1993. Walleyes and saugeyes were identified using horizontal starch gel electrophoresis and histochemical staining procedures for the supernatant form of phosphoglucomutase (PGM-1). External characteristics did not …
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Fish Community Structure and Associated Habitat in the James River, Southwest Missouri
… due to human disturbances. Boat and backpack electrofishing methods were used to determine fish populations at six sites, and previously published fish-based metrics were tested using Pearson correlation and principal components analysis to determine if they display changes in relation to …
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Smallmouth Bass Seasonal Dynamics in Northeastern South Dakota Glacial Lakes
… collected using modified-fyke nets and night electrofishing in rocky habitats. Monthly mean catch per unit effort (CPUE) values of smallmouth bass collected with modified-fyke nets were variable, but generally low among months and lakes. Monthly mean CPUE values for smallmouth bass collected …
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Evaluation of Largemouth Bass Harvest Regulations For South Dakota Waters
… than 350 mm were collected during pre-regulation electrofishing samples conducted on Lake Alvin. After imposition of the length limit, the quality of the largemouth bass population increased. In 1988 and 1989 electrofishing samples, largemouth bass 380-mm and longer in Lake Alvin composed 19% and …
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An evaluation of harvest, survival, growth, and movement of five strains of rainbow trout (Salmo gairdneri) in Virginia Streams
… strain in March and May, respectively. Creel and electrofishing surveys were conducted to determine harvest, movement and survival after fishing. A reference (unfished) stream was also selected and stocked with 50 of each strain, and electrofishing surveys were conducted to determine survival, …
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Population Characteristics and Sampling Methods of Catfish for the James and Big Sioux Rivers
… type, hook type, and bait type along with electrofishing and different hoop net combinations. All gear comparisons were based on 96 hoop net sets and 96 trotline sets split equally between two baiting options and 79.6 hours of electrofishing effort. Soybean baited hoop nets caught 736 …
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Population Dynamics of Largemouth Bass and Panfish in South Dakota Ponds
Spring electrofishing samples were collected from 13 small impoundments in 1988 to determine relationships between largemouth bass Micropterus salmoides and bluegills Lepomis macrochirus in South Dakota. Largemouth bass catch per hour of electrofishing, defined as catch per unit effort (CPUE) for …
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Detection probabilities and local population demographics of fishes in urbanized and forested streams of the New River basin, Virginia
… detection probabilities of stream fishes among electrofishing passes and size/age groups in the middle New River basin, Virginia. I also examined differences in detection probabilities between two physiographic regions: the middle New River basin, and the upper Wabash River basin, Indiana; and …
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Factors affecting largemouth bass recruitment in a trophy bass reservoir of Virginia, Briery Creek Lake
… first summer with nest surveys, light traps, and electrofishing. Nesting success was higher in BCL (53%) than SRR (31%). Initial light trap catch-per-unit-effort (CPUE) was higher in BCL than SRR but, by July, light trap and electrofishing CPUE was higher in SRR than BCL. LMB nest success, growth, …
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Evaluation of Brook Trout (Salvelinus fontinalis) Introductions and Re-introductions Into Four Virginia Blue Ridge Mountain Streams
… Sweet Run were new introductions. Single pass electrofishing (EF) surveys were conducted with a backpack electrofisher five times during the study. Selected trout > 70 mm but < 100 mm and all trout > 100 mm received a Biomark® 134.2 kHz passive integrated transponder (PIT) tag to identify …
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