2020-12-10 18:01:10
The research was published in the journal Aquatic toxicology on November 26, 2020. Scientists from the Fish Viral Pathologies unit, within the Ploufragan-Plouzané-Niort laboratory of Anses, tested the effect of a 10 month exhibition to the substance glyphosate pure and two commercial herbicide formulations based on glyphosate, on adult rainbow trout aged four years. The substance was in concentration comparable to that found in nature : approximately 1 µg per liter. No major changes in mortality rate, reproductive success or metabolism were observed in exposed fish compared to unexposed fish. On the other hand, two months before laying, the proportion of macrophages, white blood cells involved in immunity, decreased by 70% in trout exposed to one of the two commercial formulations. At the same time, phagocytosis activity, a component of the immune response, decreased by 35% for trout exposed to glyphosate-based herbicides. These effects were not found for trout exposed to pure glyphosate, which suggests that co-formulants contained in herbicides also come into play. Additional work will be carried out to better understand this drop in immunity, by evaluating the ability of fish to defend themselves against infections. The potential impacts of glyphosate, alone or in commercial herbicide formulations, will also be evaluated on subsequent generations, from exposed breeding stock.
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