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.
Results
Showing 1 to 20 of 96 for “"CPUE"”.
-
Exploring spatial heterogeneity of CPUE year trend and nonstationarity in fisheries stock assessment, an example based on Atlantic Weakfish (Cynoscion regalis)
… to explore the possible spatial heterogeneity of CPUE (catch per unit effort) year trend based on three fishery independent surveys and explore the influence of nonstationary natural mortality on the fisheries management through a MSE (Management Strategy Evaluation) algorithm based on the …
-
Feasibility of Indexing Largemouth Bass Population Density Using Electrofishing Catch Rate and Water Conductivity Measurement
… 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 May and June of 1991 and …
-
Recovery status and chemosensory cues affecting reproduction of freshwater mussels in the North Fork Holston River downstream of Saltville, Virginia
… using a snorkeling catch-per-unit-effort (CPUE) method. At sites where investigator CPUE values (no./h) equaled or exceeded 5 mussels/h, a CPUE survey was conducted along transect lines. If investigator CPUE values equaled 10 mussels/h, a quadrat survey was conducted along the transects. …
-
The application of general linear modelling methods to estimate trends in abundance of the hake and rock lobster stocks off South Africa
… of these stocks are the catch per unit effort (CPUE) data because it assumed that CPUE is proportional to abundance. The nominal CPUE (hake catch divided by actual time trawled) for both the West and South Coast stocks has shown a steady growth over the period 1978 - 1994, increasing at a rate …
-
Population Dynamics of Largemouth Bass and Panfish in South Dakota Ponds
… defined as catch per unit effort (CPUE) for stock-length fish, was inversely correlated with bass proportional stock density (PSD) (i= - 0.70, P=0.01), and relative stock density of preferred-length bass (RSD-P) (r = -0.79, P=0 .001). Largemouth bass CPUE was positively correlated …
-
The status and productivity of the Cape hake stock off the west coast of South Africa based on an age-structured production model with different stock-recruitment and fishing selectivity-at-age relationships
… estimator, and takes catch per unit effort (CPUE), as well as biomass survey data into account. The ad hoc tuned VPA is based on the Laurec-Shepherd tuning algorithm and utilizes catch-at-age and effort information. Applications of an age-structured model, which takes both CPUE and …
-
Assessment of White Bass Populations in Missouri River Impoundments Located in South Dakota
… 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 reservoirs. Long term …
-
Extracting fish abundance indices from recreational fishing competition data
… and the standardised catch per unit effort (CPUE) of the ten most abundant species across the competitions were assessed. CPUE trends for red roman, snoek and geelbek were comparable to commercial fishery-dependent CPUE data. The targeting of specific species in the multi-species fishery …
-
Migrations of spiny rock-lobsters, Jasus Lalandii, at Luderitz : environmental causes, and effects on the fishery and benthic ecology
… lalandii, fishery as to whether declines in CPUE were due to changes in rock-lobster migration patterns or a reduction in fishable biomass. Rock-lobster migrations were studied at two sites by estimating in situ density in the 10-12m and 15-20m depth zones. Water temperature and dissolved …
-
Structure and Dynamics of Largemouth Bass Populations in Eastern South Dakota Glacial Lakes and Large Impoundments
… of 2000 and 2001. Mean catch per unit effort (CPUE; number of stock-length largemouth bass per hour of electrofishing) ranged from 1.5 in November to 101.4 in June of 2000 and from 13.3 in October to 182.9 in June of 2001. In general, mean CPUE peaked during late spring-early summer and …
-
Stock assessment of the Chokka Squid : Loligo vulgaris reynaudii
… 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 fishery; that the jig …
-
PATTERNS OF AMERICAN BUMBLE BEE (BOMBUS PENSYLVANICUS) ABUNDANCE ACROSS RESTORED HABITATS IN EAST TEXAS ECOSYSTEMS
… I modeled catch-per-unit-effort (CPUE) predictors across 31 transects on seven East Texas properties spanning forests to grasslands. I modeled CPUE variables from local vegetation structure, landscape composition and configuration, and management history. Habitat openness …
-
Seasonal Variation in Sampling Indices for Fish Populations Collected From the Missouri River Below Fort Randall Dam, South Dakota
… 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 between sites for …
-
An investigation of spatial-temporal diel changes in Loligo reynaudii catch rates in the commercial squid jig fishery of South Africa
… and assuming standardised Catch Per Unit Effort (CPUE) to be a representative measure of local abundance and proportional representation of regional population distribution: this study employed statistical modelling to specifically investigate whether, on the commercial squid jig fishing grounds …
-
Do hurricanes and other severe weather events affect catch per unit effort of reef-fish in the Florida Keys?
… changes in effort and catch-per-unit- effort (CPUE), and analyzing those changes across various temporal, spatial, and species-specific scenarios. Responses in each variable were analyzed within and across scenario factors and explored for correlations and linear multivariate relationships with …
-
Factors affecting largemouth bass recruitment in a trophy bass reservoir of Virginia, Briery Creek Lake
… (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, and CPUE did not differ between areas in BCL that were experimentally closed and areas left open to angling. …
-
Use of main channel and shallow-water habitat by larval fishes in the lower Missouri River
… 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 hydrologic and finally …
-
An Assessment of the Channel Catfish Population in the Big Sioux River, South Dakota
… in the middle and lower segments. Stock-length CPUE did not differ among segments (P = 0.14), but among-segment differences in memorable-length CPUE approached significance (P= 0.07). Relative stock density of preferred-length fish (RSDP) was higher at sites with low stock-length CPUE (r = …
-
An Examination of the Variability of Migratory Timing Statistics Estimated From Catch and Effort Observations
… of the mean arrival time based on catch or CPUE of fishes migrating into a fixed harvest area is a function of the number of days fished. Simulation studies using chinook salmon catch and effort data from the Yukon River delta, Alaska indicate that fishing effort concentrated at the tails of …
-
Structure, Dynamics, and Movement Patterns for Crappies in South Dakota Waters
… inversely correlated with catch per unit effort (CPUE) and was positively correlated with condition by size category. Condition and CPUE were the only independent variables that significantly contributed to multiple regression models for the dependent variable growth. Size structure was inversely …
Page 1 of 5