Responsibility
Prevention, treatments clear muddy ponds
Water turbidity caused by suspended soil particles decreases productivity in culture ponds. Erosion control is the logical first step in correcting muddy ponds.
Responsibility
LC50 calculations help predict toxicity
LC50 – the concentration of a substance that is lethal to 50 percent of the organisms exposed to it in a toxicity test – is a useful tool because it can predict the effects of a potential toxin in aquaculture systems.
Responsibility
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.
Responsibility
Overview of mechanical pond aeration
Mechanical pond aerators increase the rate at which oxygen from air enters water by providing a greater surface area to facilitate diffusion.
Responsibility
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.
Responsibility
Probiotics’ enhancement of soil, water quality examined
Probiotics used as bottom soil and water quality enhancers are primarily cultures of living bacteria, enzyme preparations, or the two combined.
Responsibility
Secchi disk visibility: Correct measurement, interpretation
It would be difficult to find a pond aquaculture worker who has not measured Secchi disk visibility or at least seen someone measure it.
Responsibility
Zeolite ineffective as pond treatment
Zeolite is used in industry for water softening and as media for molecular sieves but has no real benefit for aquaculture in ammonia removal.
Responsibility
U.S. study finds turbidity useful In TSS, ISS estimates
Total suspended solids concentration is time-consuming to measure, but turbidity has been used to estimate TSS concentrations in some types of effluents.
Responsibility
Mineral salts correct ionic imbalances in culture water
Since the application of mineral salts to correct ionic imbalances has improved survival and production, the practice is becoming increasingly common.
Responsibility
Chemical fertilizers in pond aquaculture
Chemical fertilizers are frequently used in pond aquaculture to stimulate phytoplankton productivity and enhance the availability of natural food organisms.
Responsibility
Organic matter in pond bottom sediment
Organic matter – including fertilizers, unconsumed feed and feces of culture animals – settles to pond bottoms, often with a negative impact on water quality.
Responsibility
EPA drafts effluent guidelines for U.S. aquaculture
The United States Environmental Protection Agency published draft aquaculture effluent guidelines in the Federal Register.
Responsibility
Land and water use issues in aquaculture
It behooves us to understand land and water use issues and understand the differences between aquaculture and traditional agriculture.
Responsibility
Standardize terminology for low-salinity shrimp culture
There is increasing interest in low-salinity shrimp culture in inland areas because it is thought that disease control is easier to implement.
Health & Welfare
Ecuador study shows wild postlarvae use down
During the 1970s and 1980s, Ecuador's shrimp industry relied almost entirely on wild postlarvae but has since developed large hatcheries.