Economic Feasibility of Culture Using the Copper Alloy Net Cage and the Profit Model of Fish Farm on Yellowtail, Seriola quinqueradiata

2021 ◽  
Vol 52 (2) ◽  
pp. 33-54
Keyword(s):  
Copper Alloy ◽  
Fish Farm ◽  
Economic Feasibility ◽  
Profit Model ◽  
Seriola Quinqueradiata ◽  
Net Cage

Biological Phosphorus Removal and Denitrification of a Fish Farm Effluent in a Sequencing Moving Bed Biofilm Reactor

2009 ◽  
Vol 44 (3) ◽  
pp. 233-242
Author(s):  
Juan D. Restrepo ◽  
Marc-André Labelle ◽  
Serge Parent ◽  
Richard Villemur ◽  
Pierre Juteau ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Oxygen Demand ◽  
Fish Farm ◽  
Economic Feasibility ◽  
Biofilm Reactor ◽  
Biological Phosphorus Removal ◽  
Moving Bed ◽  
Volatile Solids ◽  
Stock Tank ◽  
Biological Phosphorus

Abstract Removal of phosphate and nitrate from the effluent of a fish farm with a recirculation system was tested in a sequencing moving bed biofilm bioreactor (SMBBR) over a 160-day period. This bioprocess made use of a stock tank (ST) that allowed the same volume of anaerobic water to be reused from one batch to another. Water from the ST contained an excess of a carbon source (acetate), which made it possible to alternate between anaerobic (1.5 h) and aerobic/anoxic (4 h) conditions to achieve enhanced biological phosphorus removal (EBPR). The developed biomass (2,072 mg total solids m-2 d-1 and 892 mg total volatile solids m-2 d-1 ) removed 7.5 mg of PO4-P per litre and 8.5 mg of NO3-N per litre from an influent containing 10 mg of PO4-P per litre and 21 mg NO3-N per litre. The dynamic variation of phosphate and chemical oxygen demand (COD) in the influent showed that the biomass was sensitive to the CODavailable/Pinfluent ratio. A ratio of 10 to 15 mg of COD per milligram of P seemed to favour phosphorus accumulating organisms (PAOs). Differences between the nitrate, phosphate, and oxygen reduction kinetics suggested that the denitrification could be attributed to organisms other than PAOs. The SMBBR-ST showed potential for EBPR and for denitrification as well. However, the economic feasibility of implementing such a process in a full-scale operation remains to be demonstrated.

scholarly journals Economic Feasibility of Converting from a Bare Ground System with Seepage Irrigation to Plasticulture for Cabbage Production: Where is the Risk?

HortScience ◽  
2018 ◽  
Vol 53 (6) ◽  
pp. 875-881
Author(s):  
Charles E. Barrett ◽  
Lincoln Zotarelli ◽  
Lucas G. Paranhos ◽  
Peter Dittmar ◽  
Clyde W. Fraisse ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Air Temperature ◽  
Production System ◽  
Economic Feasibility ◽  
Major Influence ◽  
Regression Equations ◽  
Bare Ground ◽  
Profit Model ◽  
Ground System ◽  
Seepage Irrigation

Weather has a major influence on cabbage (Brassica oleracea var. capitata L.) production. Variation in yield between years and cropping seasons is common in North America. Cabbage in Florida has historically been cultivated on bare ground with seepage irrigation. The objectives of this study were to compare yield and profit of a bare ground cabbage production system used in Florida with an alternative plasticulture system. Data from various cabbage trials were combined by production system and used to create regression equations that predicted yield based on air temperature and solar radiation that were significantly correlated with yield. The regression equations were then simulated with correlated stochastic air temperature and solar radiation to estimate the yield distributions for both systems. Cabbage price ($/Mg fresh) was stochastically simulated (correlated to yield) to be used in the profit model. The profit model was created by using the product of yield and the price per unit yield minus fixed and variable costs associated with production and marketing. Simulated profit for bare ground and plasticulture was used to estimate their respective distributions to provide a tool for making better management decisions in the presence of risky weather conditions. The plasticulture system was estimated to have a 36% higher cost but a 57% higher profit than the bare ground system. This is, in large part, because the simulated mean yield for the bare ground system was 29.7 Mg·ha−1 compared with 54.4 Mg·ha−1 for plasticulture. These findings confirmed that plasticulture is an economically viable best management practice for cabbage production in Northeast Florida.

Numerical Modeling of Wake Effect on Aquaculture Nets

2013 ◽  
Author(s):  
Per Christian Endresen ◽  
Martin Føre ◽  
Arne Fredheim ◽  
David Kristiansen ◽  
Birger Enerhaug
Keyword(s):  
Large Deformations ◽  
Measurement Data ◽  
Fish Farm ◽  
Numerical Code ◽  
Water Current ◽  
Mooring Line ◽  
Wake Effect ◽  
Drag Forces ◽  
Net Cage ◽  
Net Cages

Accurate modeling of drag forces on net cages due to water current is important when designing floating fish farm systems. These drag forces give a major contribution to the total environmental forces on a fish farm, especially mooring line forces. When subjected to current, the net cage will deform. High current velocities can result in large deformations and lead to collapse of the net cage. For circular fish farms with a flexible floating collar, large deformations may induce contact between the weighting system and the net, resulting in abrasion that can cause tearing of the net material and consequently failure that will lead to fish escape. The motivation for this paper is to obtain a better understanding and more accurate model for drag forces and corresponding deformations of circular net cages due to water current. Calculation of drag forces on a net cage is complicated due to the porous nature of the net, geometry and flexibility of the system. Adding to the complexity is the wake effect, or reduced velocity, behind each individual twine which will have a significant effect on the forces and deformations of the net cage. This wake effect will result in reduced inflow velocity on parts of the net being downstream. A method for estimating wake effects acting within an aquaculture net structure was developed and implemented in a numerical code taking net deformation into account. Numerical simulations of a cylindrical net cage were compared with experimental results. Comparison between simulations with and without wake effect revealed a reduction in total drag up to 22% when wake effect was applied. Although the model consistently overestimated drag forces on the net cage (average deviation of 25%), simulation results compared well with measurement data, particularly for low current velocities where deviations were as low as 7%. This indicates a consistent wake effect and drag model that produces conservative estimates of drag forces on net cages.

scholarly journals Environmental Characteristics in a Fish Farm with Copper Alloy Cage System in the Dardanelles

2020 ◽  
Vol 52 (6) ◽  
Author(s):  
Sinan Uzundumlu ◽  
Yesim Buyukates ◽  
Murat Yigit ◽  
Musa Bulut ◽  
Rıdvan Kaan Gurses ◽  
...  
Keyword(s):  
Copper Alloy ◽  
Fish Farm ◽  
Environmental Characteristics ◽  
Cage System

scholarly journals Isolation of Multidrug-Resistant Stenotrophomonas maltophilia from Cultured Yellowtail (Seriola quinqueradiata) from a Marine Fish Farm

2005 ◽  
Vol 71 (9) ◽  
pp. 5598-5600 ◽  
Author(s):  
Manabu Furushita ◽  
Akira Okamoto ◽  
Toshimichi Maeda ◽  
Michio Ohta ◽  
Tsuneo Shiba
Keyword(s):  
16S Rrna ◽  
Marine Fish ◽  
Horizontal Transfer ◽  
Stenotrophomonas Maltophilia ◽  
Multidrug Resistant ◽  
Fish Farm ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Seriola Quinqueradiata

ABSTRACT Six strains of multidrug-resistant Stenotrophomonas maltophilia were isolated from cultured yellowtail. The strains were divided into two clusters based on the 16S rRNA genes, and all of them contained L1 metallo-β-lactamase and L2 β-lactamase genes. Differences in the intercluster divergence between the lactamase genes suggest that horizontal transfer of the genes occurred.

Fish-farm lice acquitted of killing wild fish

Nature ◽  
2010 ◽  
Author(s):  
Emma Marris
Keyword(s):  
Fish Farm ◽  
Wild Fish
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