Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Fisheries and Oceans Canada Service, have transferred among several departments. The formal name of the department is the Department of Fisheries and Oceans. It is also referred to as "Fisheries and Oceans Canada" under the Federal Identity Program. <nowiki>*</nowiki>In 1935, the Department of Marine was merged with the Department of Railways and Canals and the Civil Aviation Branch of the Department of National Defence to form the Department of Transport, also known as Transport Canada. Text of each law and its regulations can be found by entering the name of the law at the Canadian Legal Information Institute. Fisheries and Oceans Canada Fisheries and