Microgadus tomcod, also commonly known as tommy cod or tomcod (poulamon or petit poisson des chenaux in French), Atlantic tomcod or winter cod, is a type of cod fish found in North American coastal waters from the Gulf of St. Lawrence, St. Lawrence River and northern Newfoundland, south to Virginia.
The season of the tomcod varies by location -- one known example is the Sainte-Anne River in Quebec, where its season is from late-December to mid-February. The town of Sainte-Anne-de-la-Pérade is notable for its fishing village built on the frozen waters of the Ste-Anne, playing host to the scores of fishermen visiting the town to fish for tomcod.
Example of evolution
After General Electric dumped polychlorinated biphenyls (PCBs) in the Hudson River from 1947 through 1976, tomcod living in the river were found to have evolved an increased resistance to the compound's toxic effects. Scientists identified the genetic mutation that conferred the resistance, and found that the mutated form was present in 99 percent of the tomcods in the river, compared to fewer than 10 percent of the tomcods from other waters.
- Welsh, Jennifer (February 17, 2011). "Fish Evolved to Survive GE Toxins in Hudson River". LiveScience. Retrieved 2011-02-19.
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