Connecticut researchers found no pesticides in lobsters collected in Long Island Sound in late 2014, a new study has found, boosting evidence that warming water temperatures are the main culprit in a huge crustacean decline that has decimated the local lobster industry.

The findings raise questions about restrictions Connecticut passed in 2013, amid concern over declining lobster stocks, limiting coastal use of pesticides that can control mosquito populations that transmit diseases, including the West Nile and Zika viruses.

Lobstermen supported the restrictions, believing pesticides contributed to lobster die-offs. Some municipal and environmental officials were opposed, saying the rules would restrict the use of effective mosquito-controlling pesticides that can protect public health and there was no proven connection between pesticides and lobster die-offs.

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