Phytoplankton is the direct or indirect bait base of fish and other economic animals in water, which is of great significance to determine the production performance of water areas and has a very close relationship with fishery production. However, the red tide caused by one or more plankton (mostly phytoplankton) in seawater is harmful to fisheries under certain environmental conditions. With the development of coastal industrial and agricultural production, eutrophication and water pollution in this sea area are becoming more and more serious. Red tides occur frequently, and their scale, duration and frequency are getting heavier and heavier. After the occurrence of red tide, the material circulation and energy flow in the marine ecosystem are disturbed, which directly threatens the survival of marine life, causes huge losses to fishery production, destroys the marine ecological balance, damages coastal tourism and harms human health. With the aggravation of water eutrophication, red tide has become worldwide, and people
2. Algae can be used as an indicator of water pollution.
Algae can be used as an indicator of water pollution.
The sensitivity of algae to organic matter and other pollutants is different, and the water quality can be judged by the composition of algae community. Because algae can release oxygen and utilize nutrients such as N and P in water, it can be used as oxidation pond to treat sewage. Biofilm composed of algae, bacteria and protozoa can decompose organic matter in water. It plays a certain role in purifying and judging water quality. 3. Medicinal and edible value of algae. The medicinal value of algae has been recorded as early as Shennong's Herbal Classic, Bielu of Famous Doctors and Compendium of Materia Medica. Edible and medicinal algae include laver, kelp, Gracilaria, Eucheuma and Nostoc flagelliforme. Carrageenan and agar can be used as laxatives and adhesives.
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