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Showing 1 to 20 of 37 for “"aquaculture systems"”.
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Modeling effects of U-tube aeration in recirculating aquaculture systems
… and operation in high density recirculating aquaculture systems (RAS) requires consideration of the effects of RAS component design, water quality, and biological processes on oxygen transfer requirements. A computer model was developed to simulate multi-component gas transfer and biological …
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Risk Analysis of Tilapia Recirculating Aquaculture Systems: A Monte Carlo Simulation Approach
… analytical model developed for a Re-circulating Aquaculture Systems through incorporation of risk considerations to evaluate the economic viability of the system. In addition the objective of this analysis is to provide a well documented risk based analytical system so that individuals …
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Temperature impact on nitrification and bacterial growth kinetics in acclimating recirculating aquaculture systems biofilters
… using higher temperatures in recirculating systems.
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A Comparative Analysis of Three Biofilter Types Treating Wastewater Produced in Recirculating Aquaculture Systems
Nine recirculating systems at the Virginia Tech Aquaculture Center were placed on line and stocked with yellow perch, <I>Perca flavescens</I>, fingerlings. Fish were stocked at a density of approximately 455 fish m³. Biofilter types were the only factor differing among system designs and were an …
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Comparative Growth of All-Female Versus Mixed Sex Yellow Perch (Perca flavescens) in Recirculating Aquaculture Systems
Nine, production-scale, recirculating aquaculture systems were utilized to compare the growth parameters between all-female and mixed sex yellow perch stocks. Each system was stocked with 455 fish m⁻³ and contained one of three different biofilter types: a rotating biological contactor, a trickling …
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The Effects of Salinity on Zootechnical Performance of Spotted Seatrout (<i>Cynoscion nebulosus</i>) in Recirculating Aquaculture Systems
… is a euryhaline finfish candidate for marine aquaculture in the northern Gulf of Mexico. Aquaculture of this species currently uses salinities of 25 psu or greater making production challenging in areas where high salinity water is not available. This study aimed to document the effects of …
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Impact of Ozonation on System Performance and Growth Characteristics of Hybrid Striped Bass (Morone chrysops (f) x Morone saxatilis (m)) Reared in Recirculating Aquaculture Systems
… striped bass reared in pilot scale recirculating systems. Nitrogenous wastes and dissolved organic compounds increased linearly (p < 0.01) throughout the trial under both ozonated and unozonated conditions. Ozone treatments 13 and 25 g O₃ / kg feed received 170 kg more feed than the control …
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A comparison of suspended particle size and sediment loading produced by artificial and seaweed diets in integrated flow-through and re-circulating aquaculture systems on a commercial South African abalone farm
… integration of abalone-seaweed re-circulation systems. This is a new system design of abalone fed on a kelp diet integrating seaweed culture facilitated by a re-circulation system. This kind of culture has the potential to increase abalone growth through increased water temperature, minimizing …
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Use of praziquantel for treatment of flatworm parasites in centrarchid fish
… PARASITES OF FISH, BOTH IN THE WILD AND IN AQUACULTURE SYSTEMS. THESE PARASITES INCLUDE CESTODES ALONG WITH MONOGENEAN AND DIGENEAN TREMATODES. PRAZIQUANTEL IS A DRUG WITH ANTI-FLATWORM ACTIVITY AND IS WIDELY USED IN HUMAN AND VETERINARY MEDICINE. AT THIS TIME PRAZIQUANTEL IS NOT APPROVED …
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Describing the Cell Biology of Saprolegnia parasitica: Role of Metals and Respiration
… a serious disease affecting freshwater fish and aquaculture systems. Despite the increasing use of copper-based treatments to control this infection, little is known about how S. parasitica responds to fluctuations in metal availability at the physiological and mitochondrial levels. This study …
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Responses of Nitrifying Bacteria to Aquaculture Chemotherapeutic Agents
… understanding the impact of the treatment to the aquaculture system as an ecosystem. Currently, there is a narrow variety of chemicals approved by either the Food and Drug Administration (FDA) or the Environmental Protection Agency (EPA) for the treatment of disease outbreaks and water quality …
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Production of hybrid striped bass (Morone chrysops x Morone saxatilis) in a recirculating aquaculture system
… male) cultured in pilot-scale recirculating aquaculture systems. Hybrid striped bass were stocked in nine 12,500 liter recirculating systems at a mean density of 149 fish/m³. Mean weight at stocking was 40.6 g. Overall survival averaged 72.5%. One system experienced 100% mortality due to the …
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Acute and chronic effects of ammonia in the South African abalone, Haliotis midae Linnaeus (Mollusca)
… water. Build-up of ammonia in abalone aquaculture systems can reach high toxic levels and impact negatively on farming operations. Ammonia levels therefore have to be regulated. Accurate estimates of toxic un-ionized ammonia (FAN) from the total ammonia nitrogen (TAN) measured by …
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Variations of Vibrio Populations in Pacific White Shrimp, <i>Litopenaeus vannamei</i>, Aquaculture Raceways
<p>Reducing incidence of vibrioses in intensive aquaculture systems is essential to maintaining yields. This study performed real-time qPCR (quantitative polymerase chain reaction) using primers targeting 16s rDNA sequences for total bacteria, the <em>Vibrio</em> genus, and <em>Vibrio …
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Aquaponics : community and economic development
… tilapia, perch, lettuce, farming, closed-loop systems, community development, economic development, cash flow analysis, sustainability, economic viability, hydroponics, recirculating aquaculture systems, integrated aquaculture, integrated agriculture, worker-owned cooperatives, agroecology.
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Aquaculture of Pacu (Piaractus mesopotamicus) and a Comparison of its Quality: Microbiological, Sensory, and Proximate Composition
… quality of pond cultured pacu was compared to aquacultured hybrid striped bass, tilapia, and rainbow trout grown in pond and recirculating aquaculture systems. Sensorial analyses for differences in flavor, preference, and color were also determined. Protein concentration significantly …
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Investigation of the Microbiome of a Recirculating Aquaculture System (RAS) for Crassostrea virginica Larvae
<p>Recirculating Aquaculture Systems (RAS) offer control over physicochemical and biological factors impacting aquaculture success. One understudied facet of RASs is the water microbiome. Oyster larval microbiomes are shaped by their aquatic microbiomes. Understanding the dynamics of and the …
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WTP for RAS salmon by the US consumer
… an emerging production method, recirculating aquaculture systems (RAS), which directly addresses the environmental challenges associated with the traditional farming method, open-net pens. Because of the higher costs associated with RAS, the salmon it produces requires a price premium, and …
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The development of a modular integrated recirculating aquaculture system using Porphyra (nori) for the bioremediation of marine finfish effluent
<p>It is crucial for the development of the fish aquaculture industry to be managed in a way that provides a reliable, long term source of products without negatively impacting the environment. The simplest form of integrated multi-tropic aquaculture (IMTA) uses a fed component (e.g. finfish) and …
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Denitrification of Recirculating Aquaculture System Waters Using an Upflow Biofilter and a Fermented Substrate
… concentrations typically seen in recirculating aquaculture systems was studied using a synthetic nitrate wastewater supplied at two nitrate loadings, 1.13 and 2.52 kg NO3-N/m3/day. A supplemental carbon source was provided primarily through the fermentation of fish food which generated volatile …
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