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Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.
Economic costs from invasive species can be separated into direct costs through production loss in agriculture and forestry, and management costs. Estimated damage and control costs of invasive species in the U.S. amount to more than $138 billion annually. [96] Economic losses can occur through loss of recreational and tourism revenues. [117]
A self-published article by Michael Briggs, at the UNH Biodiesel Group, offers estimates for the realistic replacement of all vehicular fuel with biodiesel by utilizing algae that have a natural oil content greater than 50%, which Briggs suggests can be grown on algae ponds at wastewater treatment plants. [168]
Various methods are employed. Mesh enclosures for finfish can be suspended in the open seas, cages can be used in more sheltered waters or ponds can be refreshed with water at each high tide. Shrimps can be reared in shallow ponds connected to the open sea. [165] Ropes can be hung in water to grow algae, oysters and mussels.
Beaver dams typically range in length from a few meters to about 100 metres (330 ft). [6] Canals can be over 0.5 kilometres (1,600 ft) long. [7] The largest known beaver dam is in Wood Buffalo National Park in Alberta, Canada, and is 775 metres (2,543 ft) long. [8]
Water: Basic Environment Law and Water Pollution Control Act: Environmental quality standard: no more than 0.0005 mg/L in waterway and ground water. Effluent standard: no more than 0.005 mg/L in effluence. Soil: Basic Environment Law and Soil Contamination Countermeasures Act: Environmental quality standard: no more than 0.0005 mg/L sample ...
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