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Light penetration in water
https://www.globalseafood.org/advocate/light-penetration-in-water/?_rt=MTA5fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=ce52ce2e8f…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/?_rt=MTEwfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=ac393a0961…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/?_rt=MTExfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=9980f0784e…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/?_rt=MTEyfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=13789e999a…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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Accuracy of custom water analyses varies
https://www.globalseafood.org/advocate/accuracy-of-custom-water-analyses-varies/?_rt=MTEzfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=292df20088…concentrations similar to expected concentrations, the charge balance was 1.03, and the total concentration of measured ions was similar to the estimated total ion concentration. Boyd, Results of analyses of…
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On-farm trials test new products, methods
https://www.globalseafood.org/advocate/on-farm-trials-test-new-products-methods/?_rt=MTE0fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=117c7038f4…in treatment 2, and it would be unwise to conclude simply from looking at the data that treatment 2 was different from either the control or treatment 1. Boyd, Example…
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Appraising pond liners for shrimp culture
https://www.globalseafood.org/advocate/appraising-pond-liners-shrimp-culture/?_rt=MTE1fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=c0fb6fd7e2…check Asian Shrimp News, 2nd Quarter, 1994, Published by Asian Shrimp Culture Council, Issue No. 18. And Boyd, C.E., Tucker, C.S., (2014). Lined Ponds. In Handbook for Aquaculture Water Quality,…
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Evaluación de revestimientos plásticos de estanques para el cultivo del camarón
https://www.globalseafood.org/advocate/evaluacion-de-revestimientos-plasticos-de-estanques-para-el-cultivo-del-camaron/?_rt=MTE2fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=4311621ee4…esta herramienta de producción. Para información adicional, los lectores interesados pueden verificar Asian Shrimp News, 2nd Quarter, 1994, Published by Asian Shrimp Culture Council, Issue No. 18. And Boyd, C.E.,…
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Effective management avoids gas bubble trauma
https://www.globalseafood.org/advocate/effective-management-avoids-gas-bubble-trauma/?_rt=MTE3fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=7d051186ae…gas (or air) in water is 100 percent. Boyd, Concentrations of individual gases, Table 1 Water Temp. (° C)Concentration (mg/L) NitrogenConcentration (mg/L) OxygenConcentration (mg/L) ArgonConcentration (mg/L) Carbon DioxideConcentration (mg/L) Air…
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Evaporation affected by sunlight, temperature, wind
https://www.globalseafood.org/advocate/evaporation-affected-by-sunlight-temperature-wind/?_rt=MTE4fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=6a106170eb…vapor pressure (Table 1). Saturation vapor pressure increases with rising temperature. Boyd, Saturation vapor pressure, Table 1 Temperature (° C)Saturation Vapor Pressure (mm Hg) 4.579 5 6.543 10 9.209 15…
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Settling basin design, operation
https://www.globalseafood.org/advocate/settling-basin-design-operation/?_rt=MTE5fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=f9144fe156…larger than 0.004 mm is quite long and seldom practical for large inflow rates. Boyd, Settling velocities and times, Table 1 Particle Diameter (mm)Terminal Settling Velocity (m/second)Time to Settle 1…
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Multiple methods for phytoplankton assessment
https://www.globalseafood.org/advocate/multiple-methods-for-phytoplankton-assessment/?_rt=MTIwfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=ecb900c8fa…Boyd, Assessment of Secchi disk, Table 1 Secchi Disk Reading (cm)Comments Less than 20 cm Pond is too turbid. If pond is turbid with phytoplankton, there will be problems with…
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Liming materials for aquaculture
https://www.globalseafood.org/advocate/liming-materials-for-aquaculture/?_rt=MTIxfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=f0639f335d…liming materials. Limestone may be classified based on its calcium and magnesium concentrations (Table 1). Boyd, Calcium and magnesium concentrations, Table 1 TypeCalcium (%)Magnesium (%) Pure calcite 40.0 Calcitic limestone…
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Dissolved oxygen requirements in aquatic animal respiration
https://www.globalseafood.org/advocate/dissolved-oxygen-requirements-in-aquatic-animal-respiration/?_rt=MTIyfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=d0133c0873…and 9.07 mg/L dissolved oxygen and water at 30 degrees-C with 8.30 mg/L dissolved oxygen. Boyd, Solubility of oxygen in freshwater at different temperatures, Table 1 Temperature (° C)Dissolved Oxygen…
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Aquaculture ponds hold carbon
https://www.globalseafood.org/advocate/aquaculture-ponds-hold-carbon/?_rt=MTIzfDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=3280a48ed5…sequestered by natural lakes and inland seas (Table 1). It is much less, however, than the amounts of carbon buried in river reservoirs and agriculturally eutrophic impoundments. Boyd, Comparison of…
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Cage design, placement affect water quality
https://www.globalseafood.org/advocate/cage-design-placement-affect-water-quality/?_rt=MTI0fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=03d9d11c9b…and a 4-meter-diameter, 4-meter-deep circular cage both have a potential flushing efficiency of 25 percent. As the sizes of circular or rectangular cages increase, flushing efficiency declines further. Boyd, Lateral…
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Assessing, reducing pond seepage
https://www.globalseafood.org/advocate/assessing-reducing-pond-seepage/?_rt=MTI1fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=b4cd44f0af…clay. The average seepage rate was 23.1 cm/month. Table 1 classifies seepage categories for earthen ponds. Normal seepage was considered to be less than 20 cm/month. Boyd, Seepage class categories,…
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Trace metals toxic at high concentrations
https://www.globalseafood.org/advocate/trace-metals-toxic-at-high-concentrations/?_rt=MTI2fDd8Ym95ZHwxNzY1MDg4NDcw&_rt_nonce=cc1a413f8d…parent minerals is low pH. Low redox potential also greatly increases the solubility of iron, manganese and a few other trace metals. Boyd, Typical concentrations and maximum safe concentrations, Table…