what marine organisms are found in this iver?
Redfin Pickerel, Largemouth Bass, Golden Shiner, Yellow Perch, a variety of sunfish, etc.
Charles River
The Charles River is home to a wide range of freshwater fish species and some diadromous species. There are over 25 species able to be found in the Charles and some of the most common freshwater fish include the Redfin Pickerel, Largemouth Bass, Golden Shiner, Yellow Perch, a variety of sunfish (such as Bluegills, Redbreast Sunfish, and Pumpkinseeds), and some species of catfish (Yellow Bullhead, Brown Bullhead, White Bullhead). The diadromous fish (fish that spend parts of their lives in fresh and salt water) that can be found in the Charles are mostly anadromous species (fish that migrate from sea to freshwater to spawn). These include the Alewife Herring, American Shad, White Perch, and Striped Bass. The only catadromous species (fish that migrate from freshwater to sea to spawn) in the Charles is the American Eel. 
jaws is not a film about a shark No, it is a film about a man-eating great white shark attacks beachgoers at a summer resort town when was this film released? 1975 by whom was it directed? Steven Spielberg and produced by? Richard D. Zanuck and David Brown can you mention anyone who worked on the music for this film? John Williams has it been adapted into any other media? Yes, its been adapted into video games, mobile games, etc. where was the movie shot? Massachusetts can you mention any geographical features of this place? It is located in the New England region of the northeastern United States and has an area of , 25.7% of which is water, Boston is the largest city, at the inmost point of Massachusetts Bay, and the mouth of the Charles River can you tell me a bit about the river? Long river in eastern Massachusetts.  From its source in Hopkinton the river's mouth is northeast of its headwaters, though it follows a highly meandering route, doubling back on itself several times and traveling through 23 cities and towns before reaching the Atlantic Ocean at Boston
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Charles River [SEP] Fish
The Charles River is home to a wide range of freshwater fish species and some diadromous species. There are over 25 species able to be found in the Charles and some of the most common freshwater fish include the Redfin Pickerel, Largemouth Bass, Golden Shiner, Yellow Perch, a variety of sunfish (such as Bluegills, Redbreast Sunfish, and Pumpkinseeds), and some species of catfish (Yellow Bullhead, Brown Bullhead, White Bullhead). The diadromous fish (fish that spend parts of their lives in fresh and salt water) that can be found in the Charles are mostly anadromous species (fish that migrate from sea to freshwater to spawn).