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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 28 for “"hatchery reared"”.
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GROWTH PATTERNS AND SIZE-GROUP INTERACTIONS IN HATCHERY-REARED AGE-0 LAKE STURGEON
… and conservation, but is expensive. When hatchery sturgeon do not grow large enough before stocking, their odds of survival decline significantly and resources are wasted. We investigated the potential limiting effect of large lake sturgeon on the growth rate of smaller conspecifics housed …
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Corticosteroid receptor dynamics and smolting in hatchery-reared and wild coho salmon (Oncorhynchus kisutch)
… and Gil changes were examined in juvenile hatchery and wild coho salmon over the spring when the fish were molting. Plasma cortisol levels showed an increase in concentration during the spring in all groups. The rise in cortisol concentration, however, was significantly greater in the wilds …
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Effects of Pre-Release Physical Stressors on Post-Release Success of Hatchery-Reared Spotted Seatrout
Alteration of habitat associated with coastal development and increased demand for food and recreation can result in the depletion of fisheries resources such as the Spotted Seatrout (Cynoscion nebulosus), the Gulf of Mexico’s most popular recreational fish. Stock enhancement, or the release of …
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Effects of temperature and density on the facial malformation of hatchery-reared cisco, Coregonus artedi
… cisco due to population declines. However, hatchery-reared cisco develop flat, subterminal snouts in hatchery environments instead of the pointed, terminal mouth observed in the wild. The cause and onset of the malformation could be the result of physical trauma, diet, genetic …
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Feeding of Hatchery-reared Brown Trout (Salmo trutta L.) In Relation To The Diet In A South Dakota Stream
… the diel drift patterns of stream invertebrates. Hatchery-reared brown trout may require a longer acclimation time before full exploitation of invertebrate drift develops.
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The Effects of Stocking Density and Feeding Frequency on Aggressive and Cannibalistic Behaviors in Larval Hatchery-Reared Spotted Seatrout, <i>Cynosion nebulosus</i>
… Stock enhancement is the practice of releasing hatchery-reared juveniles to increase local recruitment beyond existing levels. However, raising enough Spotted Seatrout in an intensive aquaculture system has proven difficult due to aggression and cannibalism during the larval stages. </p> <p>The …
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Environment-induced Phenotypic Plasticity in the Teeth of Hatchery and Wild Largemouth Bass, <i>Micropterus floridanus</i>
Successful stock enhancement of hatchery-reared fish depends heavily on the release of individuals able to demonstrate strong survival skills. Overall survival of fishes is a reflection of a successful blend of physiology, anatomy, and behavior. With fishes being highly phenotypically plastic, the …
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Habitat Selection of Gulf-Strain Striped Bass, <i>Morone saxatilis</i>: Relationships to Dynamic Abiotic Environmental Characteristics Within the Biloxi River, Mississippi
… and pH) in the Biloxi River, MS system. Juvenile hatchery-reared and feral adult Gulf-strain Striped Bass were acoustically-tagged and continuously monitored via active and passive telemetry from November 2012 – June 2014. Each month the available abiotic environmental characteristics of 40 random …
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Initial Characterization of Attachment of Infectious Pancreatic Necrosis Virus
… is an economically important pathogen of young, hatchery-reared trout. Little information is available on the early steps of IPN virus infection. In this study a method of assaying attachment of IPN viruses to Chinook Salmon Embryo (CHSE) cells was developed. The attachment of …
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Environmental impact of stocked Mulloway (Argyrosomus japonicus) in New South Wales estuaries
… as discrete holes or basins up to 20 m deep. Hatchery-reared fish initially had significantly greater movements (greater than 10 km in 3 d) when released in shallow water, compared to hatchery-reared fish released directly over deep holes. Such targeted release strategies could revolutionise …
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Evaluation of a fall stocking of adult and intermediate largemouth bass (Micropterus salmoides) into two Ohio River embayments
… Resources stocked adult and intermediate size hatchery reared largemouth bass (Micropterus salmoides) into two Ohio River embayments in an attempt to supplement existing populations. Prior to stocking each fish was fitted with an anchor tag and a visible implant elastomer mark to help ensure …
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Influence of Diet and Environmental Variation on Physiological Responses of Juvenile Pallid Sturgeon (Scaphirhynchus albus)
… the decline of pallid sturgeon. Stocking of hatchery raised pallid sturgeon has been an important short-term recovery effort for the prevention of local extirpations. Thus, producing healthy pallid sturgeon, maximizing genetic diversity, and preserving locally adapted populations are critical …
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Applied ecology and management of a European barbel Barbus barbus population of a lowland river
… a combination of enhancement stocking using hatchery-reared fish and habitat improvement schemes, especially gravel jetting of spawning substrates. There is, however, little knowledge on the effectiveness of these. Consequently, this research investigates B. barbus in rivers in England …
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Flatfish stock enhancement: Examining conditioning strategies to promote success
… is the process of providing individuals reared for stock enhancement with some degree of "wild" experience prior to release. Flatfish trained for "wild" conditions may more easily and successfully transition to natural environments. This dissertation identifies strategies that optimize …
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Factors Limiting Overwinter Survival of Young-Of-The-Year Largemouth Bass in South Dakota
… pit (7. 3 hectare), and laboratory aquaria. Hatchery reared YOY largemouth bass were graded into short (19-45 mm TL) and long (58-135 mm TL) length groups. Overwinter mortality was 78% and 85% in the two impoundments, and 100% in the gravel pit. Overwinter mortality in all study sites my be …
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Impacts of hypoxia on largemouth bass (Micropterus salmoides) behavior, physiology, and acclimation potential
… bass to a low oxygen environment using hatchery-reared fish, to determine if largemouth bass had the ability to induce plastic changes to their phenotype within a hypoxic environment. This study held two groups of fish at differing oxygen levels (3.0 mg/L and 9.0 mg/L) for 50 d, where …
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Parasite host interaction between the freshwater pearl mussel (Margaritifera margaritifera) and brown trout (Salmo trutta) – the impact from glochidia larvae on the host
… in previous studies performed in laboratory with hatchery reared and artificially infected fish. The glochidia is a potent parasite, and when they come in high numbers, they cause a disease state to its host. The symptoms can be seen both physiological and behavioral but subdued behavior symptoms …
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Environmental influences on the behavioural ecology of juvenile salmonids – the importance of rearing density
… to enhance the welfare and fitness of released hatchery-reared fish. Methods: In papers II-IV sea-ranched trout and salmon were reared from early life stage in conventional hatchery tanks with modified physical structure and/or density. Hatchery fish were measured for growth, studied for …
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