Upper Klamath Lake

Several varieties of suckerfish apparently migrated into Upper Klamath Lake at some time during the Klamath Basin project. As of1970, the official count of Lost River suckerfish was unknown, and the shortnose suckerfish was very rare. By 1976, estimates rose to 94,000 Lost River suckerfish and 252,000 shortnose suckerfish. Since then, suckerfish kills have taken place during years of high water levels—1995, 1996, and 1997—and by 1997, the suckerfish populations were estimated to have declined about 50 percent to 46,000 Lost River suckerfish and 146,000 shortnose suckerfish. There were no suckerfish kills in 1992 and 1994, when water levels in the lake were low. In only three years since 1991... 

A. flos-aquae grows naturally in Upper Klamath Lake, OR, USA. This cyanobacterium contains various nutrients including polyunsaturated fatty acids, protein, carotenoids, vitamins, and minerals and have therapeutic effects [32]. Dried Aphanizomenon cells contained 616 pg of B12 per 100 g when assayed using microbiological method [33]. However, the corrinoid compound purified from these dried cells was identified as pseudo-Bi2 [33]. 

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