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Showing 1 to 20 of 130 for “"hatchery"”.
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Food Habits of Snakes in an East Texas State Fish Hatchery
… 1969 to 1 August 1970 in the Jasper State Fish Hatchery near Jasper, Texas to determine the amount of predation by snakes on fish being propagated. The hatchery consisted of 63 earthen ponds. A total of 373 snakes were captured. Results of stomach contents analyses of the 206 snakes containing …
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Assessment of a pond for oyster hatchery development in South Africa
… potential site for the development of an oyster hatchery in Velddrif, South Africa. Over the study period it was observed that the site was not suitable for oyster larvae culture due to the following factors: temperature spikes during the summer months, low dissolved oxygen levels, high salinity …
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The presence of amphibian ranavirus in Virginia warm water fish hatchery ponds
… in two ponds at Harrison Lake National Fish Hatchery in Charles City County, Virginia. Therefore, the primary objective of this study was to determine if ranavirus is present in tadpoles from four warm water fish hatcheries in Virginia. A secondary objective of this study was to determine if …
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DOES FAT MATTER? Lipidomics investigations during Blue mussel (Mytilus sp.) hatchery production
… decline. The establishment of industrial mussel hatchery production could represent one solution to secure a spat supply to the growers, as it may reduce the reliance of the sector to unreliable natural spatfalls. Nevertheless, hatchery-produced seedlings are expensive, thereof, to ensure a …
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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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Release of Juvenile Mussels into a Fish Hatchery Raceway: a Comparison of Techniques
… laboratory and subsequently release into a fish hatchery raceway during June, September and March. Juveniles released in June experienced a gradual decline in survival rate, with 50% survival after 72 days and stable survival thereafter until 200 days. Juveniles released in September and March …
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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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Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012
… residualized smolt stage at the Spokane Tribal hatchery for release back into Lake Roosevelt. Fall spawning run data (2009 – 2012) were analyzed to assess the percentage and sex ratios of each stock returning to spawn in Lake Roosevelt. We had record returns of hatchery kokanee in 2009 (n = …
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Field investigation and simulation of nutrient control in a fish-hatchery wastewater stabilization pond system
The aquaculture sector has been the fastest growing animal food producer since the 1970’s. With such a fast growth rate, ecological problems have arisen due to the lack of ability to control nutrient run off in coastal systems. Conversely, land-based fisheries provide an ecologically sustainable …
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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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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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Development of broodstock conditioning-, induced spawning-, and hatchery methods for the South African spotted grunter (Pomadasys commersonnii)
… introduced with the live rotifers into the hatchery, as well as with introduced diluted algae cultures. Microbial contamination persisted in all larval rearing trial. It is very likely that the microbes proliferated in the hatchery tanks as a result of the unavoidable increase in organic …
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Influence of Early Life Stage Hatchery Enhancement Practices on Maternal Reproductive Investment in Coho Salmon (Oncorhynchus kisutch)
Fish hatchery enhancement programs are a central component of Canadian Pacific salmon management, supporting commercial, recreational, cultural, and conservation objectives. However, the consequences of captive rearing environments for the reproductive phenotype of returning adults remain poorly …
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Land Use Impacts of Plastic Mulch Tomato Production and Evaluation of Sorbent Control on Shellfish Hatchery Operations
During the 1990s, shellfish hatcheries operating on the Eastern Shore of Virginia noticed an increase in mortalities of their clam larvae; it was suspected that this was a result of the deteriorating quality of the estuarine water used by aquaculture hatcheries. Many hatcheries obtain their …
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