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2. Nitrate - Wikipedia

   en.wikipedia.org/wiki/Nitrate

   In freshwater or estuarine systems close to land, nitrate can reach concentrations that are lethal to fish. While nitrate is much less toxic than ammonia, [20] levels over 30 ppm of nitrate can inhibit growth, impair the immune system and cause stress in some aquatic species. [21] Nitrate toxicity remains a subject of debate. [22]

3. Nitrification - Wikipedia

   en.wikipedia.org/wiki/Nitrification

   In contrast, freshwater invertebrates are more tolerant (~90+mg/l), and adult freshwater fish can tolerate very high levels (800mg+/l). [51] Nitrate levels also contribute to eutrophication , a process in which large algal blooms reduce oxygen levels in bodies of water and lead to death in oxygen-consuming creatures due to anoxia.

4. Freshwater aquarium algae - Wikipedia

   en.wikipedia.org/wiki/Freshwater_aquarium_algae

   Green algae respond strongly to bright light conditions as well as unbalanced carbon dioxide and nutrient levels in the water of freshwater aquaria. [ 3 ] Green spot algae (GSA), most likely of the genus Coleochaete , is a spot-forming algae that slowly covers glass, aquarium furniture , and plants.

5. Freshwater environmental quality parameters - Wikipedia

   en.wikipedia.org/wiki/Freshwater_environmental...

   Freshwater environmental quality parameters are those chemical, physical and biological parameters that can be used to characterise a freshwater body. Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations.

6. Freshwater supplies are ‘abruptly’ depleting across the globe ...

   www.aol.com/freshwater-supplies-abruptly...

   Freshwater supplies are ‘abruptly’ depleting across the globe, NASA warns ... measurements showed that the average amount of freshwater on land was 290 cubic miles lower than average levels ...

7. Total dissolved solids - Wikipedia

   en.wikipedia.org/wiki/Total_dissolved_solids

   For freshwater, oysters, trouts, and other high-value seafood, the highest productivity and economic returns are achieved by mimicking the TDS and pH levels of each species' native environment. For hydroponic uses, total dissolved solids are considered one of the best indices of nutrient availability for the aquatic plants being grown.