Study tracks short-term glyphosate exposure in sea cucumbers

A new study in Animals tested how short-term, dietborne glyphosate exposure affects Japanese sea cucumber (Apostichopus japonicus) when the herbicide is delivered through a sea mud-based feed matrix designed to mimic benthic aquaculture conditions. Over 72 hours, researchers confirmed internal glyphosate residues in exposed animals and found that residues were distributed differently across tissues, but they did not observe mortality or obvious external lesions. Most digestive, immune, and antioxidant biomarkers stayed relatively stable, although amylase responded in the low-dose group and superoxide dismutase changed in the medium- and high-dose groups. The gut microbiota showed subtle treatment-related compositional shifts, even as overall predicted microbial functions remained broadly similar. The paper was published April 28, 2026, by Jingchun Sun, Libin Zhang, Christopher D. Hepburn, Shaoping Kuang, and Hongsheng Yang. (mdpi.com)

Why it matters: For veterinary and aquatic animal health professionals, the study adds route-specific evidence that sediment-linked herbicide exposure can register biologically in a deposit-feeding mariculture species even when short-term clinical signs are absent. That matters because sea cucumbers naturally ingest sediment-associated material, and prior research has underscored both the central role of sea mud in feeding systems and the importance of gut health and microbiota in A. japonicus performance. In that context, the new findings suggest gut-community shifts may serve as an earlier signal of exposure than overt disease or broad enzyme disruption, which could be useful for surveillance in coastal production systems where agricultural runoff is a concern. (mdpi.com)

What to watch: The next question is whether longer exposures, field conditions, or commercial glyphosate formulations produce stronger effects on growth, immunity, disease susceptibility, or microbiome stability in sea cucumber culture. (mdpi.com)