ammonia (nh3) and nitrite (no2) toxic chemicals which resulted from fish culture, especially in intensive fish culture systems. to evaluate the efficiency of green algae scenedesmus quadricauda in ammonia and nitrite removal from intensive fish farm effluent and also its application as suitable culture medium for s. quadricauda , effluent water samples were collected from rainbow trout farm. si...

Since increasing the NO3 and NH4 make eutrophication in waterbodies, microalgae tolerance tohigh concentrations of NO3 and NH4 and their growth in these levels indicate the bioremediationpotential of nitrogen-rich wastewaters and produce efficient algal biomass in freshwaterenvironments. To evaluate the tolerance of green algae, Scenedesmus quadricauda to different NO3and NH...

Karenia brevis is the dominant toxic red tide algal species in the Gulf of Mexico. It produces potent neurotoxins (brevetoxins [PbTxs]), which negatively impact human and animal health, local economies, and ecosystem function. Field measurements have shown that cellular brevetoxin contents vary from 1-68 pg/cell but the source of this variability is uncertain. Increases in cellular toxicity cau...

A major impact of eutrophication is the stimulation of algal growth and the production of harmful algal blooms (HABs). HABs can have profound negative effects on the environment, which include severe dissolved oxygen depletion, fish kills, discoloration of marine water, beach closures, etc. Owing to the extremely complicated ecological processes, previous research efforts indicate that it is fa...

Algal blooms have been increasing in prevalence all over the world, destroying ecosystems and placing other organisms at risk. Chemical remediation is one of most important methods of controlling algal bloom formation. The effects of copper sulfate, hydrogen peroxide (H(2)O(2)) and N-phenyl-2-naphthylamine on photosynthesis-related and microcystin-related gene transcription and physiological ch...

In this study, an upper limit in the solar energy conversion efficiency which can be translated to a maximum potential algal yield of a large-scale culture is calculated based on the algal productivity model in which light and nutrient are made the growth rate limiting factors, and taking the design characteristics of the cultivation system into account. Our results indicate that for the produc...

Using chitosan modified soil to flocculate and sediment algal cells has been considered as a promising strategy to combat cyanobacteria blooms in natural waters. However, the flocculation efficiency often varies with algal cells with different zeta potential (ZP) attributed to different growth phases or water conditions. This article investigated the relationship between ZP of Microcystis aerug...

In upstream reaches, epilithic algae are one of the major primary producers and their biomass may alter the energy flow of food webs in stream ecosystems. However, the overgrowth of epilithic algae may deteriorate water quality. In this study, the effects of environmental variables on epilithic algal biomass were examined at 5 monitoring sites in mountain streams of the Wuling basin of subtropi...

Climate changes and the potential related warming can change runoff, nutrient transport, mean wind velocities and water temperatures. These changes will further affect algal growth in a way that can be modelled. The changes to the nutrient load, temperature regime and algal biomass were simulated by three separate models. The simulations were made for the years 2020, 2050 and 2090. The simulate...