Aquaculture Articles
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Commercial composting provides food for thought
The retail sector and food manufacturers produce a mountain of waste but, unlike householders, they cannot simply throw it in the compost and wait for it to rot down. The Compost Association told edie about the obstacles in the way of recycling waste from the commercial sector. Compared to household domestic waste, biodegradable matter from the retail and catering sector represents only a small ...
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Enhancing competitiveness, product quality and market integration of small mussel growers: a South African case study
The key proposition in this paper is that the competitiveness of small firms operating in emerging economies and producing highly perishable products (e.g. mussels) is largely contingent on their ability to contend with high Transaction Costs (TC). The study examines the role of contracting in reducing TC associated with small-scale mussel farming in South Africa. Market risks, uncertainties, ...
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The Ecological Fishprint of Nations: Measuring Humanity’s Impact on Marine Ecosystems
In November, 2006, a prominent team of ecologists and economists issued this dire warning: if current fishing patterns continue, all major commercial fish species will suffer population collapses by 2048. In March 2005, the United Nations State of the World Fisheries and Aquaculture report stated that 7 of the top 10 marine fish species, accounting for about 30 percent of all capture fisheries ...
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Hatchery- Grieg Seafood, Canada
Installed in November 2004 Scope of supply: Three systems, Photon PMD320K6/10, including automatic quartz cleaning system. Duty/ Standby operation. Challenge: The main target organism is Furunculosis (Ameromonas Salmonicida). Total Flow: 900 m3/h Transmittance: 88% in a 10 mm cell Background The threat of disease is one of greatest dangers to a commercial hatchery. ...
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HD Q-PAC® Media for Aquarium Water Treatment in Life Support System: pH, Dissolved Oxygen, and Turbidity Improved Significantly
The Newport Aquarium needed to improve the clarity and quality of sea water in its large fish exhibit. After evaluating alternatives with independent consultant Dave LaBonne, Jeff Gibula (Husbandry Operations Manager) decided to use HD Q-PAC® media in his one of his life support systems. HD Q-PAC® is considered an excellent choice for use in aquarium water treatment, both for newly constructed ...
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Molecular evolution of haemoglobins of polar fishes
The Arctic and the Antarctic differ by age and isolation of the respective marine faunas. Antarctic fish are highly stenothermal, in response to stable water temperatures, whereas the Arctic ones are exposed to seasonal and latitudinal temperature variations. The knowledge of the mechanisms of phenotypic response to cold exposure in species of both polar habitats offers fundamental insights into ...
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Planktonic microbial assemblages and the potential effects of metazooplankton predation on the food web of lakes from the maritime Antarctica and sub-Antarctic islands
Antarctica is the continent with the harshest climate on the Earth. Antarctic lakes, however, usually presents liquid water, at least during part of the year or below the ice cover, especially those from the sub-Antarctic islandsand the maritime Antarctic region where climatic conditions are less extreme. Planktonic communities in these lakes are mostly dominated by microorganisms, including ...
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Individual Rationality and the “Zonal Attachment” Principle: Three Stock Migration Models
Shared fish stocks migrate across borders between different countries’ exclusive economic zones. This paper discusses the individual rationality of fish-sharing agreements based on the zonal attachment of such stocks. Three types of migrations are considered: (i) a common stock that grows and reproduces and is then distributed in given proportions between two countries’ zones at the beginning of ...
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Fisheries bioeconomics: why is it so widely misunderstood?
Many fisheries management systems, even when based on apparently sound science, have failed to prevent severe overfishing. And even when successful in this sense, such systems have frequently resulted in a large degree of excess fishing capacity. The reason for these failures can often be found in a lack of consideration of the economic incentives affecting fishermen. Specifically, when forced to ...
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Partial International Coordination in the Great Fish War
This study extends the great fish war model of Levhari and Mirman [Levhari, D. and Mirman, L. (1980) Bell Journal of Economics 11: 322–344] by incorporating a multiple country context into the model and investigates the existence of a partial coordination Nash equilibrium. First, findings of this paper suggest that a partial coordination scheme is sustainable only in limited cases. Any coalition ...
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Traceability in postharvest quality management
Traceability is now an expected component of most modern supply chains for perishable foods traded internationally. The ability to trace back and trace forward information associated with production and postharvest handling activities with specified lines of products to provide evidence of good practice has become increasingly important. There are opportunities to add significant value to these ...
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A conceptual framework for the sustainability assessment procedures of the shrimp aquaculture industry in coastal Bangladesh
Shrimp aquaculture is now establishing itself as an important aquaculture industry in coastal Bangladesh. However, the benefit of this industry is concentrated to only the interests of a specific group of people who contribute a significant amount of foreign earnings to the nation, while the present development process is posing a challenge to the coastal sustainability, as well as the industry ...
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Biomarkers and pollutants in the Nile Tilapia, Oreochromis niloticus, in four lakes from San Miguel, Chiapas, Mexico
The effects of the oil industry and environmental pollutants present in four lakes from Reforma, Chiapas, Mexico, were assessed via ethoxyresorufin O-deethylase activity (EROD), PAH metabolites, and butyrylcholinesterase activity (BChE) in Nile Tilapia, Oreochromis niloticus. Fish were collected during two seasons (the rainy season in September 2000 and the dry season in May 2002) from the lakes ...
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Settlement Dynamics of the Encrusting Epibenthic Macrofauna in Two Creeks of the Caeté Mangrove Estuary (North Brazil)
Abstract The epibenthic encrusting fauna of 2 creeks of the Caeté mangrove estuary, northern Brazil, was studied over a 13 month period using collectors fixed at 2.5 and 3.5 m above the creek bottom and in which upper and lower sides of ceramic and wooden panels were used as settlement substrates. The number of individuals of the most abundant organisms (barnacles, oysters and mussels) settling ...
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Comparative study of body composition of four fish species in relation to pond depth
Abstract Fish specimen of Labeo rohita, Cirrhinus mrigala, Hypophthalmicthys molitrix and Catla catla were sampled from three ponds of different depths (152 cm, 122 cm and 76 cm) to compare the body composition of these species in relation to pond depth. There was significant (P < 0.001) effect of pond depth on water, ash, organic, fat and protein contents (all % wet and dry body weight). It ...
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Qualitative algal analysis from the fish-gut: Tested in the rice fish cropping system
Abstract: Algae constitute a major proportion of fish food in rice-fish culture system. Study of algal preferences and their availability in the natural environment might be important for developing natural fish feed. Preparation of formulated feeds using under-exploited materials such as algae not only reduces production costs, but also increases procurement accessibility of locally available ...
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Impact of Microzooplankton and Copepods on the Growth of Phytoplankton in the Yellow Sea and East China Sea
Dilution and copepod addition incubations were conducted in the Yellow Sea (June) and the East China Sea (September) in 2003. Microzooplankton grazing rates were in the range of 0.37–0.83 d-1 in most of the experiments (except at Station A3). Correspondingly, 31–50% of the chlorophyll a (Chl a) stock and 81–179% of the Chl a production was grazed by microzooplankton. At the end of 24 h copepod ...
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Valuation and Management of Fishing Resources Under Price Uncertainty
The traditional expected-net-present-value methods cannot properly capture the management flexibility and strategic value aspects of a fishery, and may understate its value. Instead, this paper develops a Real Options model to conceptualize and evaluate fishery exploitation flexibility. Specifically, general models to value the opportunity to either exploit or invest in a fishery are presented. ...
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Self-Organizing Maps in Revealing Variation in Non-obligatory Riverine Fish in Long-term Data
Sensitiveness to the overall influence of the river channel regulation, impoundment and pollution was studied for 12 non-obligatory riverine (NOR) fish species in the Warta River, Poland, over the period of 1963–1998. Their total abundance has not considerably changed unlike the structure of their aggregation, which was revealed by a self-organizing map (SOM, Kohonen unsupervised artificial ...
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Seasonal Dynamics of Periphyton in a Large Tropical Lake
Tropical aquatic systems are generally assumed to have little seasonality in productivity patterns. However, this study indicated that there was substantial seasonal variation in epilithic productivity and biomass in tropical Lake Tanganyika, due primarily to seasonal patterns in lake hydrodynamics that influence nutrient availability. Although they support much of the lake’s biological ...
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