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 19 of 19 for “"catch rate"”.
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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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Angler Harvest Survey of Lake Francis Case, South Dakota
… an angler interview survey was used to estimate catch rate. In 1981, a section of Lake Francis Case in the vicinity of the Gregory County Pump Storage Project (Zone 2) was surveyed. IN 1982, the survey was expanded to include the entire reservoir (additional Zones 1 and 3). Estimated fishing …
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The Virginia Stocked-Trout Program: An Evaluation of Anglers and Their Catch
… the fish in the state, stocking over 1 million catchable-sized trout on over 180 waters. Given the expansive effort of VDGIF and the popularity of the program, VDGIF desired to understand how anglers utilize their program and who actively fishes for stocked trout. My objectives were 1) to assess …
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Assessment of bycatch species in the Namibia Hake directed bottom trawl fishery (1997-2014)
… management, is how to manage and mitigate bycatch caught during commercial fishing. The Namibian hake-directed bottom trawl fishery has been an important component of the Namibian fishing industry for decades. Due to the low selectivity of the bottom trawling method, bycatch has been a common …
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Population/Biomass Estimates and Relative Abundance Indices of Adult Common Carp in Arrowwood and Sand Lake National Wildlife Refuges
Fish catch rates in passive gear, such as gill nets, are commonly used by biologists to index fish population density. The purpose of this project was to assess the potential relationship between common carp (Cyprinus carpio) biomass and catch-per-unit-effort (CPUE) in gill nets. Adult common carp …
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Results and Evaluation of An Aerial Creel Survey Technique On Lake Sharpe, South Dakota
… an angler interview survey was used to estimate catch rates, mean party size, mean fisherman day, and residence of the anglers. The results of the two surveys were combined to estimate harvest. The separate surveys were combined to estimate harvest. The separate surveys allowed optimum …
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Geostatistical modelling of recreational fishing data: A fine-scale spatial analysis
… an understanding of the spatial dynamics of catch per unit effort (catch rate), fishing effort and species diversity is important for fishery managers to make area-specific decisions and to develop strategies for ecosystem based fisheries management. These indices are critical components of …
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Aspects of the sustainability of creel fishing for Norway lobster, Nephrops norvegicus (L.), on the west coast of Scotland
… on how the biology of Nephrops affects its catchability in creels, as well as assessing the environmental impacts of the Nephrops creel fishery. A smaller study relating to the physiological effects of the capture and transport of live creel-caught Nephrops, has also been undertaken. …
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Stock assessment of the Chokka Squid : Loligo vulgaris reynaudii
… that the sharp decline in the trawl fishery catch per unit effort (CPUE) data in the early 1980s, reflects a real decline in the trawlers catch rate; that the decline in the trawl CPUE index is caused by the jig fishery removing the biomass that otherwise would be available to the trawl …
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Exploring spatial heterogeneity of CPUE year trend and nonstationarity in fisheries stock assessment, an example based on Atlantic Weakfish (Cynoscion regalis)
… plans to provide robust model and management strategies. Atlantic Weakfish (Cynoscion regalis), one important commercial and recreational fish species along the west coast of Atlantic Ocean that was found to be declining in recent years, was selected as an example species. My study aimed to …
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Population Characteristics and Habitat Selection of Channel Catfish (Ictalurus punctatus) in the Lower James River, South Dakota
… with hoop nets and trotlines. The mean hoop net catch rate (l.35 ± 0.25) was lower than mean catch rates for other rivers in the Midwest, indicating that a low density population exists in the lower James River. The sample was dominated by stock and quality length channel catfish (PSD=63±3) which …
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The Fish Population of Lake Poinsett, South Dakota, as Indicated By the Catch
… of a midsummer decline in gill net and trap net catches of black bullhead, black crappie, and white crappie. A late summer increase in the catch of yearling black bullheads, crappies, white bass, carp and bigmouth buffalo was attributed to an increase in activity or change in behavior pattern. …
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Shark nets in KwaZulu-Natal : an evaluation of catches and alternatives
… numbers of large sharks. The nets also take a by-catch of dolphins, sea turtles, batoids and teleosts.Catch rates of most shark species declined initially but have shown no trend since the mid-1970s. Turtle and teleost stocks do not appear to be threatened by net mortalities, but there is concern …
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Observer effects on pelagic fleet operations and Bayesian-based explorations of the mass balance model ECOPATH
… are thought to arise, inter alia, from large bycatches of sardine (counting against a bycatch allowance) with anchovy and unsuitable sizes of sardine caught for canning purposes. As there were no data that could be used as a basis to investigate the claims, little was done to substantiate them. …
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Geostatistical spatiotemporal modelling with application to the western king prawn of the Shark Bay managed prawn fishery
… variability of a process so, in order to incorporate a time dimension into a geostatistical model, the fundamental differences between the space and time dimensions must be acknowledged and addressed. The main conceptual viewpoint of geostatistical spatiotemporal modelling identified within the …
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Evaluation of Smallmouth Bass Introductions in South Dakota Lakes
… paired mean electrofishing and mean fyke net catch rates among lakes, both for stock- length (18 cm) fish (r=0.973, P=0.005) and all fish ( r = 0.948, P=0.014). These correlations suggest that both gears were not seriously affected by environmental conditions within the ranges encountered. An …
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Fishing and hunting in the Amazon floodplain : linkages among biodiversity conservation, rural livelihoods and food security
… and fishing activities, including detailed catch and effort data concerning 886 fishing trips. I show that Manaus’ favourite fish species (tambaqui, Colossoma macropomum) halves in body size and catch rate (catch-per-unit-effort in biomass; CPUEb) within several hundreds of kilometres of the …
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Urban Fisheries in Eastern South Dakota: Assessment of Angler Satisfaction and Fishery Resources
… Pond. Logistic regression analysis revealed that catch rate (fish caught/h.), party size, open water angler (yes or no), and trout angler (yes or no) were significantly related to angler satisfaction, though the importance of each variable differed by age. ―Young‖ anglers (<25 years) placed …
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Spatial and temporal population dynamics of yellow perch (Perca flavescens) in Lake Erie
Yellow perch (Perca flavescens) in Lake Erie support valuable commercial and recreational fisheries critical to the local economy and society. The study of yellow perch's temporal and spatial population dynamics is important for both stock assessment and fisheries management. I explore the spatial …