Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"Catch per unit effort"”.
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Do hurricanes and other severe weather events affect catch per unit effort of reef-fish in the Florida Keys?
… marine fish stocks and fisheries along the United States Atlantic and Gulf of Mexico coasts. However, the effects of these events on fish and fisheries are not well understood. The availability of self-reported data from two fisheries in a region frequently affected by tropical cyclones …
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Potential of a trap-fishery for the spiny lobster Palinurus delagoae off eastern South Africa : has the stock recovered?
An experimental trap fishery for the deep-water lobster spiny lobster Palinurus delagoae commenced in 2004, and was run until 2006. Data collected by on-board scientific observers were used to explore fishing effort, catches and catch per unit effort. The recent data were compared with those for a …
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Habitat suitability and population characteristics of smallmouth bass and rock bass in the Powell River, Virginia
… used to monitor effects of coal mining in the upper watershed on the Powell River. The midstream reach, which was below the North Fork Powell River, was used to monitor the possible effects of this tributary and its watershed. The downstream reach appeared to have been impacted by sedimentation …
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A Comparison Between South Dakota and North American Standard Sampling Gears in Lakes and Reservoirs
<p>A statewide gear comparison was performed in South Dakota during 2013 and 2014 between current South Dakota Department of Game, Fish and Parks (SDGFP) sampling gears (i.e., gill nets and modified fyke nets) and their equivalents described in <em>Standard Methods for Sampling North American …
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Anthropogenic Influence on Blackfin Sucker (Thoburnia atripinnis) Distribution, in the Upper Barren River System, Kentucky and Tennessee
… endemic blackfin sucker (Thoburnia atripinnis) catch per unit effort and abundance within the Upper Barren River (UBR) system, a priority conservation area, in south-central Kentucky. Anthropogenic impacts have rendered T. atripinnis a “species of greatest conservation need” by the Kentucky …
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Estimate of size and interaction of the South African anchovy and pilchard populations
… mid 1970's. This change was in agreement with catch per unit effort estimates of abundance (Newman et al in press). The anchovy abundance remained fairly constant at about 300 000 metric tons during the period 1965 - 1974 for which estimates could be made. During 1976 the pilchard stock showed …
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Fish species composition, fish sizes and diversity in the Kamutjonga floodplain, Kavango river, Namibia
… providing valuable ecosystem services to communities such as being a valuable protein source for marginalized communities. This study ultimately aims to provide information on the fish species composition, fish sizes and species diversity in the Kavango River’s Kamutjonga floodplain as a basis …
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Distribution and mixture of Cape and Cunene horse mackerel, Tachurus capensis and Tracherus trecae in the Angola-Benguela front in relation to environmental and other factors
… an analysis of survey data of horse mackerel catch per unit effort and acoustics data from R/V Dr. Fridtjof Nansen over twelve years in the region of the Angola-Benguela front. The main objectives are: to characterize the pattern of distribution and mixture of Cunene and Cape horse mackerel in …
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Assessment of White Bass Populations in Missouri River Impoundments Located in South Dakota
… their population dynamics. Age-0 white bass catch per unit effort (CPUE) in standardized seine samples from 1983 to 1995 was correlated with environmental data to assess potential relations. Environmental parameters that were significantly (P<0.05) correlated with white bass CPUE varied among …
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Conservation and recovery of the Yellow Mud Turtle (Kinosternon flavescens) in Mason and Tazewell counties, Illinois
… its Midwest range. Trapping surveys were performed to document the presence and distribution of K. flavescens inhabiting Mason and Tazewell counties, Illinois. Previous trapping in the study area from 1992-2001 resulted in a catch per unit effort of 0.1013 compared to recent studies …
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Demography of Alligator Snapping Turtles (Macrochelys Temminckii) Along a Fishing Pressure Gradient
… temminckii</em>). The spatio-temporal persistence of this threat and its impacts on <em>M. temminckii</em> populations has not been quantified. I quantified the density of passive fishing gear and the demographic parameters of <em>M. temminckii </em>along a fishing pressure gradient in …
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PATTERNS OF AMERICAN BUMBLE BEE (BOMBUS PENSYLVANICUS) ABUNDANCE ACROSS RESTORED HABITATS IN EAST TEXAS ECOSYSTEMS
… remain partially understood. In the southeastern United States, historically open habitats have shifted towards closed-canopy conditions via fire suppression, deforestation and afforestation, altering ecosystems that once supported diverse pollinator communities. Because of these changes, the …
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Seasonal Variation in Sampling Indices for Fish Populations Collected From the Missouri River Below Fort Randall Dam, South Dakota
… size structure, relative weights (Wr), and catch per unit effort (CPUE). These indices were then assessed for seasonal trends. Seasonal fluctuations were apparent in relative species composition, size structure, Wr, and CPUE. Relative species composition varied monthly within sites and also …
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Aspects of the biology of, and fishery for, the Hottentot, Pachymetopon blochii (Val.) (Sparidae), in the Western and Southwestern Cape
… Pachymetopon blochii (Val.). The fishing communities are described and social conditions are compared with those reported in earlier surveys. Changes in the fishing vessels and tackle used in the handline fishery are described and the economic status of the fishery evaluated. The distribution …
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Control of Common Carp in the Heron Lake Watershed, Minnesota
… barrier, but no tagged fish were found. Median catch-per-unit-effort in gill nets set in South Heron Lake each August decreased from 24 to 12 for common carp, and from 27. 5 to 0. 5 for bigmouth buffalo.
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Use of main channel and shallow-water habitat by larval fishes in the lower Missouri River
… spp.) and chub spp. (Macrhybopsis spp.) catch-per-unit-effort (CPUE) was higher within sandbar aquatic terrestrial transition zone (ATTZ) than main channel. Local-environmental factors accounted for the greatest proportion of variance in larval fish CPUE within sandbar ATTZ, followed by …
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Evaluation of a 23-cm (9-in) Minimum Length Limit for Black and White Crappies in Lake Alvin, South Dakota
… 1 January 1996. Both relative abundance [catch per unit effort (CPUE)] and size structure [e .g., proportional stock density (PSD)] increased following implementation of the length limit. However, these changes were more related to recruitment patterns than to regulation effects. Age …
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Feasibility of Indexing Largemouth Bass Population Density Using Electrofishing Catch Rate and Water Conductivity Measurement
… 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 impoundments during …
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Assessment of the Effects of Habitat, Harvest and Community Interactions on the Abundance of Walleye Sander Vitreus in Inland Lakes Throughout Ontario
… fishery throughout Ontario. Fish community interactions between walleye and other species are rarely considered when establishing management targets which may lead to the creation of conflicting management objectives. Other studies that have focused on competitive interactions between …
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Flow Reversal Events Increase the Abundance of Nontroglobitic Fish in the Subterranean Rivers of Mammoth Cave National Park, Kentucky
… of MCNP. Four sites were sampled over a two year period using a variety of gears. In total, sampling yielded 1849 individuals (mostly larval/juvenile) of 22 species representing nine families. Of the 22 species, 12 have never before been documented in the cave environment. The effects of local …
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