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 10 of 10 for “"Weakfish"”.
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The Effects of Ageing Error on Stock Assessment for Weakfish Cynoscion regalis
… uncertainties in the stock assessment for weakfish have precluded accurate and consistent advice concerning the management of commercial and recreational fisheries. Error within ageing techniques, used to assess relative age frequencies within commercial and recreational harvest, has been …
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Spatial and temporal heterogeneity in life history and productivity trends of Atlantic Weakfish (Cynoscion regalis) and implications to fisheries management
… on stock assessment models using Atlantic Weakfish (Cynoscion regalis) as a case study. First, spatial and temporal variation was incorporated into length-, weight-, and maturity-at-age estimates using mixed-effects models (Chapter Two). The resulting heterogeneous weight and maturity …
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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)
… 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 explore the possible …
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Evaluation of Fish Scale Chemistry for Determining Habitat Associations
… Sr:Ca, and Ba:Ca levels in scales from juvenile weakfish (<em>Cynoscion regalis</em>) from five estuaries along the Atlantic coast were measured. Significant variability in multivariate elemental signatures was found among estuaries and between collections from 1996 and 1997. Linear discriminant …
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Bioenergetic and ecological consequences of diet variability in Atlantic croaker Micropogonias undulatus
… croaker could be an important competitor with weakfish and striped bass for food resources during the spring and summer when population abundances of these three fishes are high in Chesapeake Bay. Even though anchovies made up a relatively small portion of croaker diet and only at certain times …
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Marine influence on juvenile fish trophic ecology and community dynamics in Maryland's northern coastal lagoons
… losses, no similar trend was detected in 2012. Weakfish showed no structured dependence on marine carbon in either year. Diet contents lacked corresponding year-to-year changes in pelagic versus benthic prey items. In 2009, serial changes with distance to the inlet occurred in species …
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An improved mixed-error non-equilibrium stock-production model and its application to some Brazilian fish stocks
… by independent biological studies. King weakfish is apparently on the verge of a collapse, with very low levels of production and biomass. Jamaican weakfish is around its maximum sustainable yield and the exploitation level on this stock should not be intensified. For the other two …
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Investigating the performance of process-observation-error-estimator and robust estimators in surplus production model: a simulation study
… from two example fisheries: the Atlantic weakfish (Cynoscion regalis) and the black sea bass (Centropristis striata) southern stock. Our results indicated that POE_N is the estimator with best performance among all six estimators with regard to both accuracy and precision for most of the …
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Material and Acoustic Properties of Swimbladders of Tilapia and Channel Catfish
… fish tissue. Recent findings in toadfish and weakfish, however, suggest that the bladder is a highly damped structure and that the frequency of the fish sounds is deternlined as a forced response to sonic muscle movement rather than by resonance of the bladder. In this study I examined …
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Striped Bass and Summer Flounder Population Dynamics in the Chesapeake Bay: an Ecosystem Based Evaluation
… and decrease in abundance of summer flounder, weakfish, spot, and Atlantic croaker were the main species that contributed to the difference in community structure after 2011. The change in functional group structure after 2011 was defined by a decline in opportunistic demersal fish, and this …