Showing papers in "Aquacultural Engineering in 2010"

TL;DR: This review aims to summarize the most recent developments within RAS that have contributed to the environmental sustainability of the European aquaculture sector and identifies the key research priorities that will contribute to the future reduction of the ecological impact of RAS.

TL;DR: Spearman correlation analysis was used to explore the relationship of these parameters with other water quality parameters and of shrimp performance based on growth rate and feed conversion rate and found that shrimp growth rate increased with higher temperature and dropped with higher pH.

TL;DR: In this article, the authors investigated the submerged behavior of a small volume fish cage in a single-point mooring system under currents using a numerical model and compared the results to a scaled physical model tow test.

TL;DR: A commercially available nitrifying bacterial product (Pond Protect-L®, Novozymes Biologicals Inc., Salem, VA, US) was tested in both a controlled pilot-scale experiment and within production-scale RAS that were experiencing elevated levels of nitrite.

TL;DR: It is indicated that scaled common carp should be reared under red illumination when at low stocking density and blue illumination when under high stocking density, and for the rearing of mirror carp, blue or red light should be avoided since they induced an increase in size heterogeneity.

TL;DR: The results of this study indicate that raising rainbow trout to market size in WRAS with CO2 concentrations of 24 mg/L does not significantly affect their overall health and performance.

TL;DR: The need for future biofilter evaluations at the commercial scale using real aquaculture waste nutrients is highlighted, with results considerably lower than results previously published at the laboratory scale using artificial waste nutrients.

TL;DR: The results indicate, that the more heterogeneous and stratified biofilm to be expected in FB, can react more flexibly when challenged with changes such as differences in TAN loading.

TL;DR: Results indicated that ozone addition to maintain an oxidation reduction potential of 248 mV did not significantly reduce levels of these off-flavor compounds in the water and fish flesh, though it did significantly improve culture tank water quality.

TL;DR: The results show that a mussel byssus apparatus can withstand harsh conditions, if suitable substrates are deployed and suggest that substrates need to be changed and modified according to the size of the mussel as they go through their different life cycle stages.

TL;DR: In this article, the authors measured carbon dioxide degassing in a cascade column operating with both fresh (0) and saline water (35‰ NaCl) at 15 ˚C and found that CO2 removal will be more problematic for seawater recirculating systems compared to freshwater systems.

TL;DR: In this article, the hydrodynamic behavior of gravity cage in waves is systematically analyzed by numerical methods, and the statistical approach and Fourier transform are applied to analyze the cage motion response and the mooring-line tension response in both time and frequency domain.

TL;DR: In this paper, the authors evaluated the failure risk of a single-point mooring line based on extended-period environmental loadings and showed that the recommended replacement period of a polyester (PET) line (diameter 38 mm) is about 6.55 years if the line's safety factor is 1.5 and if the required safety factor increases to 1.81 years about six times that of original life.

TL;DR: Low dose formalin in recirculated aquaculture systems proved to be a possible treatment strategy, as the effect on nitrification was minimal, and increased variation and minor reductions of ammonium and nitrite oxidation rates were observed.

TL;DR: A dynamic stock model was used for quantification of shrimp production and analysis of alternative management schemes of stocking density, pond size, starting time of aeration, and duration of cultivation for intensive commercial production of the shrimp Litopenaeus vannamei.

TL;DR: In this paper, the effects of positional angle of propeller shaft (α ), submergence depth and rotational speed of shaft on standard aeration efficiency (SAE) of a propeller-aspirator-pump aerator were investigated.

TL;DR: Three microbial mats were designed and constructed using microbial isolates obtained from semi-intensive shrimp culture ponds according to their capacity to remove inorganic nitrogen, and exhibited higher oxidation of ammonia to nitrite and nitrate nitrogen when compared with controls at higher stocking densities without water exchange.

TL;DR: Differences in recruitment density in the unprotected long-line would suggest different degree of protection from predators depending on collector texture and lacing complexity which could enhance the strength of seed attachment and create space refuges from fish.

TL;DR: T-iso seems to be particularly sensitive to the variable conditions outdoors and it is suggested that new designs of closed PBRs, specifically developed for outdoor cultivation of T-iso, try to achieve more stable and homogeneous conditions throughout the system and over the daily cycle.

TL;DR: Field experiments employing a bubble curtain and a submerged freshwater outlet to lift significant amounts of nutrient-rich seawater to the light zone to provide an environment in which non-toxic algae can bloom and create a possibility for mussels to be cleansed from the effects of toxic algae.

TL;DR: In this paper, the authors measured the efficiency with which carbon dioxide was stripped from freshwater and saline water passing through an air-lift at 15 degrees C. The air-lifting was constructed of 50 mm (OD) PVC pipe submerged 95 cm in a tank, had an adjustable air injection rate, and could be adjusted to three lifting heights: 11,16 and 25 cm.

TL;DR: Production was enhanced when supplemented wastewater was used in growth medium and changes to the relative concentrations of glycerol and yeast extract alter the amounts of oil produced and types of fatty acid produced.

TL;DR: The reactor in this study makes use of the head gained by the water recirculation of the LH-RAS without the need for additional pumps, while the bulbs are located above water surface to ease maintenance and lower costs.

TL;DR: In the present studies, the effects of various artificial shelters on behavior of juvenile sea cucumber, Apostichopus japonicus, were evaluated and shelters of stone, cement pipe, polywoven fabric, ceramic tile and PVC (polyvinylchloride) pipe attracted significantly more animals than low-pressure polyethylene pipe, wood block and corrugated PVC board.

TL;DR: In this article, a sediment retention system (SRS), consisting of a 1-m 3 truncated pyramid, was installed at the bottom of an earth pond, below a surface aerator.

TL;DR: No evidence of feeding stress was found at peak current velocities, a result compatible with the ongoing development of suspended-culture practices, and chlorophyll uptake was significantly increased in summer.

TL;DR: The OxyGuard CO2 Analyzer as mentioned in this paper is a novel meter that can directly measure aqueous CO2 gas pressure using a water-resistant gas-permeable membrane and infra-red absorption cell.

TL;DR: Growth of homogenous sized groups was studied in captive populations of Senegalese sole juveniles and it is suggested that fish size distribution is the consequence of the hierarchical structure, instead of the cause of it.

TL;DR: Biological response and hydrodynamic design techniques to specify vertically oriented oyster farming structures indicate that the deployment of vertical arrays of trays with a minimal depth of 1.0 m may efficiently utilize the water column to grow out juvenile C. virginica.

TL;DR: It is concluded that the alternative system for the outdoor culture of Chaetoceros muelleri and Dunaliella sp.