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Light penetration in water
https://www.globalseafood.org/advocate/light-penetration-in-water/…presence of dissolved organic matter and suspended solids further impedes light penetration, and different types of solids preferentially absorb at different wavelengths. Boyd, Categories of light rays and colors, Table…
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Silicon, diatoms in aquaculture
https://www.globalseafood.org/advocate/silicon-diatoms-in-aquaculture/…silicates. Boyd, Neutralizing values of pure compounds,Table 1 CompoundNeutralizing Value (%) Calcium silicate 86 Sodium silicate 82 Calcitic limestone (agricultural limestone) 100 Calcium hydroxide (hydrated lime) 135 Calcium oxide (burnt…
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Hydrogen sulfide toxic, but manageable
https://www.globalseafood.org/advocate/hydrogen-sulfide-toxic-but-manageable/…pH, the concentration would be less by a factor of 0.9. Boyd, Factors for estimating hydrogen sulfide concentration, Table 1 Temperature (° C) pHTemperature (° C) 16Temperature (° C) 18Temperature…
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Nitrite toxicity affected by species susceptibility, environmental conditions
https://www.globalseafood.org/advocate/nitrite-toxicity-affected-by-species-susceptibility-environmental-conditions/…are presented in Table 1. Boyd, Published 96-hour LC50s, Table 1 Common Name96-hour LC50 Freshwater Common carp 88.0 mg/L Catla 117.0 mg/L Mitten crab 25.9 mg/L Narrow-clawed crab 29.4 mg/L…
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Calcium and magnesium use in aquaculture
https://www.globalseafood.org/advocate/calcium-and-magnesium-use-in-aquaculture/Hatcheries, farms should monitor levels of essential nutrients Aquatic animals can get the essential nutrients calcium and magnesium from both culture water and their food. Concentrations of calcium and magnesium…
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Common salt a useful tool in aquaculture, part 2
https://www.globalseafood.org/advocate/common-salt-a-useful-tool-in-aquaculture-part-2/…at least 6:1. Boyd (1998) suggested a simple equation to determine the amount of salt (in g/m3) that should be applied to a pond, according to the expected nitrite levels…
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La sal común es una herramienta útil en la acuacultura, parte 2
https://www.globalseafood.org/advocate/la-sal-comun-es-una-herramienta-util-en-la-acuacultura-parte-2/…1. Boyd (1998) sugirió una ecuación simple para determinar la cantidad de sal (en g/m3) que se debe aplicar a un estanque, de acuerdo con los niveles de nitrito esperados…
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What causes alkalinity changes in aquaculture waters?
https://www.globalseafood.org/advocate/what-causes-alkalinity-changes-in-aquaculture-waters/Monitor and manage this important water quality parameter Alkalinity is an important water quality parameter in aquaculture systems, and must be monitored and adjusted through liming and other management measures….
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How decomposition of organic matter impacts aquaculture ponds
https://www.globalseafood.org/advocate/decomposition-organic-matter-impacts-aquaculture-ponds/Bacteria are the primary organisms of decay in aquaculture systems Bacteria – ubiquitous in terrestrial and aquatic habitats as spores, resting cells, or actively growing cells – are the primary…
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Cómo la descomposición de la materia orgánica impacta los estanques acuícolas
https://www.globalseafood.org/advocate/como-la-descomposicion-de-la-materia-organica-impacta-los-estanques-acuicolas/Las bacterias son los organismos primarios de descomposición en sistemas acuícolas Las bacterias, ubicuas en hábitats terrestres y acuáticos como esporas, células en reposo o células que crecen activamente, son…
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Factors affecting efficiency of commercial fertilizers in aquaculture
https://www.globalseafood.org/advocate/efficiency-commercial-fertilizers-aquaculture/Phytoplankton, organic matter levels are primary concerns for pond operators Many factors influence the efficiency of commercial fertilizers in aquaculture ponds. Photo by Darryl Jory. Aquaculture is becoming increasingly intensive…
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Aquaculture feed composition helps define potential for water pollution
https://www.globalseafood.org/advocate/aquaculture-feed-composition-helps-define-potential-water-pollution/Uneaten feed, feces and metabolic wastes can adversely impact water quality The most effective way of reducing the water pollution potential of feed is by using high-quality feed applied in…
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Pond aeration and aerators: Second thoughts
https://www.globalseafood.org/advocate/pond-aeration-and-aerators-second-thoughts/…concentration in the surface water is 5 mg/L and that of the bottom water is 2 mg/L, the aeration efficiency (as calculated following Dr. Claude Boyd’s 1998 method for defining…
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Atmospheric pollution affects water quality
https://www.globalseafood.org/advocate/atmospheric-pollution-affects-water-quality/Acid rain has not led to acidification of streams in the eastern United States Pollution factors such as acid rain and higher atmospheric carbon dioxide concentration are leading to reduced…
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Manage pH cycles to maintain animal health
https://www.globalseafood.org/advocate/manage-ph-cycles-to-maintain-animal-health/Ideal pH for most aquaculture species is between 6.0 and 8.5 pH levels in ponds are affected by such factors as time of day, vegetation and aeration activity. Pure water…
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Effects of mechanical aeration on evaporation rate, water temperature
https://www.globalseafood.org/advocate/effects-mechanical-aeration-evaporation-rate-water-temperature/Restricting use to periods when oxygen supplementation is needed can conserve water, lessen energy use One of the 0.5-hp Air-O-lator aerators used in this study, showing water being splashed into…
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Oxidants enhance water quality
https://www.globalseafood.org/advocate/oxidants-enhance-water-quality/Potassium permanganate and peroxide compounds used mainly as disinfectants Oxidants serve to disinfect pond water and improve water quality parameters. A number of oxidants are used in aquaculture, including chlorine…
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Efectos de la aireación mecánica sobre la tasa de evaporación, temperatura del agua
https://www.globalseafood.org/advocate/efectos-de-la-aireacion-mecanica-sobre-la-tasa-de-evaporacion-temperatura-del-agua/Restringir el uso a los períodos en los que se necesita la administración de oxígeno suplementario puede conservar agua y disminuir el consumo de energía Uno de los aireadores Air-O-lator…