Freshwater Fisheries Conservation Lab

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Stomach contents of tournament-sized bass

Another interesting aspect of our Lake Ontario bass project has been to analyze the stomach contents of tournament-sized bass. The historical diet of smallmouth was predominantly crawfish and alewife with a variety of other small fish species making up the rest. These days, the major prey item for smallmouth in Lake Ontario is gobies within the size range of the two in the picture. The switch to gobies as their main prey item is thought to be one of the reasons why smallmouth are now also much larger at a given age.