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Aquaculture-Related Stress On Rainbow Trout (Oncorhynchus Mykiss) And Arctic Char (Salvelinus Alpinus), Christopher D. Nelson
Aquaculture-Related Stress On Rainbow Trout (Oncorhynchus Mykiss) And Arctic Char (Salvelinus Alpinus), Christopher D. Nelson
Graduate Theses, Dissertations, and Problem Reports
Recent expansions in aquaculture characterize it as one of the fastest growing segments of the U.S. agricultural sector. Expansion has been facilitated by increased production of many important aquatic species including catfish, salmon, trout, tilapia, shrimp, oysters, and crawfish. West Virginia aquaculture, also an expanding industry, is currently characterized by small-scale, widely dispersed farms. To facilitate future expansion of aquaculture in West Virginia, focuses on product quality as well as production efficiency, identification of limiting factors and investigation into new or alternative management techniques are needed. Objectives of this project were to determine the effects of nitrite and carbon dioxide …
Enhancing Quality And Extending Shelf Life Of Rainbow Trout (Oncorhynchus Mykiss) By Vitamin E Supplementation And Post-Harvest Antimicrobial Intervention, Nalini Kamireddy
Enhancing Quality And Extending Shelf Life Of Rainbow Trout (Oncorhynchus Mykiss) By Vitamin E Supplementation And Post-Harvest Antimicrobial Intervention, Nalini Kamireddy
Graduate Theses, Dissertations, and Problem Reports
Rainbow trout were fed a control (191 mg/kg) or the control diet supplemented with 5000 mg alpha-tocopherol/kg. Fish were sampled at 2, 3, 4, 5, 7, and 9 weeks of feeding; at each week fillets were evaluated at 0, 7, and 14 d. Supplementation increased fillet alpha-tocopherol content, and TBARS value were not affected. A feeding by storage time interaction was observed for fat content, psychrotrophic counts, cook yield, and shear force. For antimicrobial intervention, fillets were not treated or were dipped in water, 50 ppm ASC, and 1000 ppm ASC for 30 s. Fillets were stored at 1--2°C for …
Winter Habitat Use Of Fishes In The Ohio River, Benjamin Ernst Lenz
Winter Habitat Use Of Fishes In The Ohio River, Benjamin Ernst Lenz
Graduate Theses, Dissertations, and Problem Reports
Winter is a critical period during which fishes may suffer increased mortality. To identify the habitats that fishes use in large rivers during winter conditions, we electrofished six habitat types in the Belleville Pool, Ohio River. We collected the greatest diversity and numbers of fishes in low-velocity tributary confluences when water temperatures were >4°C. When water temperatures were <4°C, certain species were collected in greater abundance in faster-velocity main channel and back channel habitats while other species continued to associate with lower flows in tributary mouths. Differing habitat use between species obscures broad generalizations about when and how fishes use overwintering refuges. In an additional habitat sampled, an embayment, 85% of all fishes collected were juveniles. Centrarchids, rarely collected in the mainstem portion of the river, were one of the dominant fishes collected in the embayment. Protecting large river embayments may prove important for managing recreational sunfish fisheries.
Brook Trout (Salvelinus Fontinalis) Movement And Habitat Use In A Headwater Stream Of The Central Appalachian Mountains Of West Virginia, Marisa Nel Logan
Brook Trout (Salvelinus Fontinalis) Movement And Habitat Use In A Headwater Stream Of The Central Appalachian Mountains Of West Virginia, Marisa Nel Logan
Graduate Theses, Dissertations, and Problem Reports
Brook trout (Salvelinus fontinalis) are the only salmonid native to the Appalachians. They are a resilient species, populating small, low productive streams. Although such streams have historically been abundant in the Appalachians, brook trout populations have been threatened due to habitat degradation such as logging and acidification of waters. The objective of this study was to evaluate brook trout habitat use, home range, and movement patterns in an Appalachian headwater stream during spring and more specifically high flow events. I implanted brook trout with radio tags and tracked their movement for approximately 30 days during late spring 2002 and early …
Seasonal Movements Of Yellow-Phase American Eels ( Anguilla Rostrata) In The Shenandoah River, West Virginia, Stephen D. Hammond
Seasonal Movements Of Yellow-Phase American Eels ( Anguilla Rostrata) In The Shenandoah River, West Virginia, Stephen D. Hammond
Graduate Theses, Dissertations, and Problem Reports
American eels undergo extensive upstream migration in Atlantic coastal river systems. Few studies, however, have focused on movements of large yellow-phase American eels near dams in upper watersheds of Atlantic coastal rivers. We examined relationships between stream flow, water temperature, and lunar phase, and movements of radio-tagged yellow-phase American eels (518--810 mm TL) near Millville hydroelectric dam in the lower Shenandoah River, West. Movements of yellow-phase American eels differed among seasons. Water temperature and stream flow were associated with upstream migration during spring. Downstream movements during fall corresponded with decreasing water temperatures and darker nights near the new moon. Localized …
Seasonal Movement And Macro-Habitat Use Of Largemouth Bass (Micropterus Salmoides) In An Ohio River Navigation Pool, Jason Gregory Freund
Seasonal Movement And Macro-Habitat Use Of Largemouth Bass (Micropterus Salmoides) In An Ohio River Navigation Pool, Jason Gregory Freund
Graduate Theses, Dissertations, and Problem Reports
Largemouth bass provide an important recreational fishery in the Ohio River. Our objectives were to determine critical over-wintering and spawning habitats of largemouth bass in the Belleville Pool of the Ohio River. We surgically implanted radio-transmitters in 39 adult largemouth bass and tracked them over a 23-month period. Our results demonstrate the importance of off-channel habitats in the life history of largemouth bass in large river systems. Sedimentation, resulting in a loss of embayment quality and surface area, is an important problem and thus merits increased attention. Restoration and protection efforts to improve largemouth bass fisheries in large river systems …