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Yukon Lake Trout Carry High DDT Levels
20 Jan
Summary
- Elevated DDT levels found in Watson Lake trout muscle tissue.
- US screening value for DDT in fish is 69 ppb; Yukon fish averaged 1,698 ppb.
- DDT levels in Watson Lake fish appear to be decreasing over decades.
Recent findings indicate elevated levels of the pesticide DDT in Watson Lake trout in the Yukon. Five sampled lake trout exhibited an average of 1,698 parts per billion of DDT in their muscle tissue, a stark contrast to the U.S. human health screening value of 69 parts per billion. This discovery has prompted recommendations for an exposure assessment to determine potential risks to consumers.
Despite the high readings, research scientist Mary Gamberg noted that DDT levels appear to be decreasing compared to a 1994 study, which found significantly higher concentrations. This persistence of DDT is attributed to heavy aerial spraying in the 1950s and 1960s, with the chemical being banned in the Yukon in 1969 and nationwide in Canada by 1985. Gamberg emphasized the need for immediate public awareness due to DDT being a carcinogen.
The Liard First Nation is reviewing the data and seeking involvement in future research to address community concerns. While historical data suggests a decline, the persistent nature of DDT means it remains a concern for the environment and potentially for those who consume fish from Watson Lake. Further funding is being sought to analyze smaller fish and provide a more comprehensive understanding of contaminant levels.
