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Ravi Fotedar - One of the best experts on this subject based on the ideXlab platform.
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Effects of feeding rates on the growth, water quality and nutrient budget of western king Prawn (Penaeus latisulcatus Kishinouye) reared in recirculating aquaculture systems
Aquaculture Research, 2012Co-Authors: Van Khoi Le, Ravi Fotedar, Martin S KumarAbstract:Feed rate is one of the important variables considered for the improvement in production of Prawns. The effects of four feeding rates on growth, water quality and the nutrient budget of Penaeus latisulcatus were investigated for 98 days. The specific growth rate (SGR) at 3.0% feed rate was significantly higher than at all higher feed rates, and there was no significant difference in SGR between 4.5%, 6% and 7.5%. Total ammonia nitrogen concentrations in all treatments remained low in the safe range for Prawn culture. Dissolved inorganic nitrogen and nitrate nitrogen were significantly higher (P < 0.05) in Prawn tanks received feed rates of 6.0% and 7.5%. Total phosphorus and the soluble reactive phosphorus linearly increased with the progression of the trial and feeding rates. Nutrient conversion rates were significantly higher (P < 0.05) in Prawns receiving the feeding rate of 3.0% than feeding rates of 6.0% and 7.5%. The lowest food conversion ratio was recorded at feeding rates of 3% and 4.5%. Nutrient budget showed that 6.01–15.99% nitrogen and 4.53–9.29% phosphorus of the nutrient inputs were retained in the Prawn biomass. The results indicated that the growth and nutrient conversion rate may not increase with the increase above 3.0% of biomass per day.
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integration of western king Prawn penaeus latisulcatus kishinouye 1896 and green seaweed ulva lactuca linnaeus 1753 in a closed recirculating aquaculture system
Aquaculture, 2011Co-Authors: Le Van Khoi, Ravi FotedarAbstract:Abstract Integrating recirculating aquaculture systems with seaweeds is one of the strategies that can minimise wastes and risk of disease outbreaks. This study investigated the effect of integrating green seaweed ( Ulva lactuca ) with western king Prawns ( Penaeus latisulcatus ) at varying stocking densities on the water quality, nutrient conversion rates and nutrient budget under closed recirculating culture system. The experiment was conducted using fifteen indoor tank recirculating systems and tested four different stocking ratios of Prawns and seaweed with a control having Prawns only. The four stocking ratios of seaweed and Prawn biomass were 2, 4, 8 and 16 per tank. The mean concentrations of total ammonia nitrogen (TAN), NO 3 − –N and PO 4 3− –P in the Prawn and seaweed tanks were significantly lower (P U. lactuca was highly efficient in removing the inorganic nutrients from the culture systems with TAN removal rate of 59–81% and PO 4 3− –P removal rate of 50–55%. Integrating seaweed with Prawns did not significantly alter the specific growth rate (SGR) and survival rate of the Prawns (P > 0.05). Ratio of C:P in seaweed tissues decreased with increasing seaweed stocking densities while C:N ratio showed an adverse trend. The nutrient conversion rate into total biomass (Prawns plus seaweed) in the integrated systems was significantly higher at the highest seaweed stocking density (2.00 kg m − 2 ). Nutrient budget revealed that seaweed retained about 6.5–29.7% nitrogen and 1.6–13.5% phosphorus inputs while values for Prawns were 28.0–31.9% and 13.5–14.6%, respectively. Seaweed also removed dissolved inorganic nitrogen effectively in the closed recirculating aquaculture system.
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Effects of stocking density on the nutrient budget and growth of the western king Prawn (Penaeus latisulcatus Kishinouye) in a recirculating aquaculture system
Aquaculture Research, 2010Co-Authors: Le Van Khoi, Ravi FotedarAbstract:Intensification in the commercial culture of Prawns can have a significant impact on the water quality and hence on the survival, growth and the surrounding environment. The present study aims to evaluate the effects of stocking density on the water quality and performance of the western king Prawns (Penaeus latisulcatus) and the nutrient budget of the culture environment. Four stocking densities of 4, 8, 16 and 32 Prawns m−2 were tested in 12 recirculating systems. Prawn weight and specific growth rate increased with decreasing stocking density, while the survival rate showed the reverse trend. The mean total ammonia nitrogen, nitrate nitrogen, total phosphorus and soluble reactive phosphorus were significantly higher (P
Le Van Khoi - One of the best experts on this subject based on the ideXlab platform.
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integration of western king Prawn penaeus latisulcatus kishinouye 1896 and green seaweed ulva lactuca linnaeus 1753 in a closed recirculating aquaculture system
Aquaculture, 2011Co-Authors: Le Van Khoi, Ravi FotedarAbstract:Abstract Integrating recirculating aquaculture systems with seaweeds is one of the strategies that can minimise wastes and risk of disease outbreaks. This study investigated the effect of integrating green seaweed ( Ulva lactuca ) with western king Prawns ( Penaeus latisulcatus ) at varying stocking densities on the water quality, nutrient conversion rates and nutrient budget under closed recirculating culture system. The experiment was conducted using fifteen indoor tank recirculating systems and tested four different stocking ratios of Prawns and seaweed with a control having Prawns only. The four stocking ratios of seaweed and Prawn biomass were 2, 4, 8 and 16 per tank. The mean concentrations of total ammonia nitrogen (TAN), NO 3 − –N and PO 4 3− –P in the Prawn and seaweed tanks were significantly lower (P U. lactuca was highly efficient in removing the inorganic nutrients from the culture systems with TAN removal rate of 59–81% and PO 4 3− –P removal rate of 50–55%. Integrating seaweed with Prawns did not significantly alter the specific growth rate (SGR) and survival rate of the Prawns (P > 0.05). Ratio of C:P in seaweed tissues decreased with increasing seaweed stocking densities while C:N ratio showed an adverse trend. The nutrient conversion rate into total biomass (Prawns plus seaweed) in the integrated systems was significantly higher at the highest seaweed stocking density (2.00 kg m − 2 ). Nutrient budget revealed that seaweed retained about 6.5–29.7% nitrogen and 1.6–13.5% phosphorus inputs while values for Prawns were 28.0–31.9% and 13.5–14.6%, respectively. Seaweed also removed dissolved inorganic nitrogen effectively in the closed recirculating aquaculture system.
W. Dall - One of the best experts on this subject based on the ideXlab platform.
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Metabolism of proline by the tiger Prawn Penaeus esculentus
Marine Biology, 1991Co-Authors: D. M. Smith, W. DallAbstract:The distribution and fate of14C-proline were investigated in immature tiger Prawns,Penaeus esculentus Haswell, collected in Moreton Bay, Cleveland, Australia, by trawling during 1986/1987. Initially the Prawns were fed14C-proline in food pellets to follow the pathway of proline absorption and distribution in the body.14C-proline was also injected directly into the Prawn to provide sufficient tracer to follow the incorporation of14C into other amino acids and into proteins. A comparison was made of the metabolism of injected14C-proline over 48 h in Prawns that had been fed and those that had been starved for 10 d. Free amino acids (FAA) in the muscle and protein-bound amino acids were analysed separately. Labelled proline was completely absorbed and distributed within the body 3 h after ingestion, about 80% being in the tissues, mostly in muscle. There was no significant difference between the total CO2 output in fed and starved Prawns, but the latter metabolised about twice the amount of labelled proline over 48 h. At this time, in abdominal muscle of fed Prawns, about 95% of the total muscle label was in the FAA; of the label in the FAA, 78% was proline and 18% glutamic acid, with the remainder in hydroxyproline, aspartic acid, glutamine, alanine and Kreb's cycle intermediates. In the starved Prawns, proline was 58%, glutamic acid 24%, with correspondingly higher amounts in the other compounds. In the muscle protein, the distribution of label was similar in fed and starved Prawns, with 72 to 74% as proline. The experiments showed that proline is not very labile in the tiger Prawn and its rate of synthesis is slow. It does not appear to be an important source of energy as in some insects and cephalopods, but during starvation is only slowly oxidised for energy.
R. Watson - One of the best experts on this subject based on the ideXlab platform.
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Life cycle assessment of wild capture Prawns: Expanding sustainability considerations in the Australian Northern Prawn Fishery
Journal of Cleaner Production, 2015Co-Authors: Anna Farmery, B. S. Green, Sarah Jennings, C Gardner, R. WatsonAbstract:Prawns and shrimp are among the most popular seafood consumed globally and their production is responsible for a range of environmental impacts in wild capture fisheries and associated supply chains. Management of the Australian Northern Prawn Fishery has been promoted as a sustainable model for other countries to emulate, although broader environmental impacts, such as those relating to energy and water use or greenhouse gas emissions are not currently monitored under sustainability assessments. We use life cycle assessment (LCA) to assess the environmental impacts of the white banana Prawn (Fenneropenaeus merguiensis). Fishing operations were the main source of impacts for the supply chain examined, contributing 4.3 kg CO2e kg-1Prawn or 63% of the overall global warming potential. This result was lower than emissions reported for other Prawn species, including tiger Prawns from the same fishery. Processing and storage were key contributors to ecotoxicity while transport made a negligible contribution to any impact category. We discuss how LCA can complement existing fisheries management, and broaden current seafood sustainability assessments including the potential for emerging fishery-specific indicators to improve the efficacy of seafood LCAs.
D. M. Smith - One of the best experts on this subject based on the ideXlab platform.
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Metabolism of proline by the tiger Prawn Penaeus esculentus
Marine Biology, 1991Co-Authors: D. M. Smith, W. DallAbstract:The distribution and fate of14C-proline were investigated in immature tiger Prawns,Penaeus esculentus Haswell, collected in Moreton Bay, Cleveland, Australia, by trawling during 1986/1987. Initially the Prawns were fed14C-proline in food pellets to follow the pathway of proline absorption and distribution in the body.14C-proline was also injected directly into the Prawn to provide sufficient tracer to follow the incorporation of14C into other amino acids and into proteins. A comparison was made of the metabolism of injected14C-proline over 48 h in Prawns that had been fed and those that had been starved for 10 d. Free amino acids (FAA) in the muscle and protein-bound amino acids were analysed separately. Labelled proline was completely absorbed and distributed within the body 3 h after ingestion, about 80% being in the tissues, mostly in muscle. There was no significant difference between the total CO2 output in fed and starved Prawns, but the latter metabolised about twice the amount of labelled proline over 48 h. At this time, in abdominal muscle of fed Prawns, about 95% of the total muscle label was in the FAA; of the label in the FAA, 78% was proline and 18% glutamic acid, with the remainder in hydroxyproline, aspartic acid, glutamine, alanine and Kreb's cycle intermediates. In the starved Prawns, proline was 58%, glutamic acid 24%, with correspondingly higher amounts in the other compounds. In the muscle protein, the distribution of label was similar in fed and starved Prawns, with 72 to 74% as proline. The experiments showed that proline is not very labile in the tiger Prawn and its rate of synthesis is slow. It does not appear to be an important source of energy as in some insects and cephalopods, but during starvation is only slowly oxidised for energy.
