Sediment microbiology, management
Sedimentation increases organic matter concentration in pond bottom soil. Particles originating from mineral soil and organic matter that do not float or dissolve settle to the bottom.
Aquaculture and the microbial world
Microorganisms reside in the sediment and other substrates, and in the water of aquaculture facilities, as well as in and on the cultured animals.
Influence of stressors on shrimp susceptibility to White Spot Disease, Part 2
Study examines the impact of environmental stressors like dissolved oxygen, nitrogenous compounds and pH on shrimp contracting White Spot Disease.
Climate change effects on aquaculture production
Comprehensive review explores the negative and positive sides of climate change on aquaculture production, and implications for its sustainability.
Is a Japanese volcano offering us a sneak preview of ocean acidification?
Shikinejima is a scenic getaway for tourists but the seas surrounding its volcano offer a glimpse of how the ocean could behave in the future.
Feeding affects pond water quality
Feeding allows much greater production of fish and shrimp, but nutrients in feed are not converted completely to fish or shrimp flesh.
Toxicity of chemical substances in aquaculture
Prof. Boyd discusses toxicity of chemical substances in aquaculture systems and the difficulties in establishing safe concentration limits for toxic metabolites.
Study: Large-scale seaweed farming for carbon capture ‘may not be feasible’
A new study raises concerns about the feasibility of global seaweed farming as a potential large-scale carbon capture solution.
The inevitable pH fluctuations of aquaculture pond water
It is one of the most commonly measured water quality variables in aquaculture, and probably the most misunderstood water quality variable in aquaculture. The pH levels in water have a propensity to change rapidly, but this is a natural phenomenon that often has little consequences and not much can be done to avoid it.
Constantly changing pH unavoidable, completely normal
Prof. Claude Boyd discusses the importance of pH for farmed fish and shellfish, the normal and natural fluctuations and how aquaculture systems can manage it.
Understanding the oxygen demand of aquafeeds
Manufactured aquafeeds, if improperly managed, can result in undesirable oxygen demand that can reduce dissolved oxygen levels and pollution through effluents, and stress cultured animals.
Fisheries in Focus: Busting misconceptions about bottom trawling and its environmental impacts
Fisheries researchers examine all environmental impacts of bottom-trawling and compare the fishing method to other forms of food production.
What is the best carbon-nitrogen ratio for biofloc systems?
A recent study at the Federal University of Rio Grande in Brazil showed that it is possible to reduce the C:N ratio in biofloc cultures, to decrease the water volume used and the total suspended solids produced, with resulting savings.
Lime plays crucial role in aquaculture pond management
Agricultural limestone is widely used to improve pH and alkalinity in aquaculture ponds. There is considerable use of lime in aquaculture to disinfect pond bottoms and water, to attempt to control pH, and various other reasons.
Improving transportation of live hybrid striped bass
Anecdotal information has suggested that pond-reared hybrid striped bass are more vulnerable to transportation-related stressors than cage-reared fish. Study results suggested that accumulation of carbon dioxide and decreasing pH levels may contribute to this phenomenon. Agitation during simulated transport mitigated the carbon dioxide accumulation and stabilized pH, but shifted the total ammonia nitrogen equilibrium in favor of un-ionized ammonia nitrogen.Ultimately, the agitators did not substantially attenuate the stress responses observed in the fish.
Norwegian salmon smolt farms embracing RAS to raise production
Smolt production in Norwegian hatcheries will likely increase during the next decade to answer salmon grow-out needs. Farmers are converting existing flow-through systems to partially or fully incorporate recirculation technologies.
Assessing the effects of low pH on taste, amino acid composition of black tiger shrimp
The effect of low pH on the survival and amino acid composition of shrimp suggests ocean acidification may affect future quality, quantity.
Advantages of aerated microbial reuse systems with balanced C:N, part 1
An alternative waste treatment is intense microbial processing of wastes to facilitate high yields with little or no water exchange.