Kelly: Mysis Shrimp are the main cause of the decreasing clarity in Lake Tahoe. Overtime, the clarity in Lake Tahoe decreases as the secchi disk can be seen less and less deep down each year. Mysis Shrimp populations have risen in population size each year since their introduction in the 1960's just as clarity has decreased in that time. It is clear this is the factor responsible for the lack of clarity in Lake Tahoe because unlike the other factors, shortly after 2011 when the Mysis shrimp disappeared, the Lake clarity increased in 2014. Then when the shrimp were back, the Lake Clarity decreased again. This factor shows a stronger correlation, than all the others, with the clarity data.