Fish live in water with a lot of phytoplankton.There are few fish in Australia because there aren't as many phytoplankton as the North Sea, where you can get a heap of sardines
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http://www.youtube.com/watch?v=HSPxXCq9krU This is a youtube video which explains what phytoplankton is. This is the 1st of 3 videos. Have fun watching!
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