August’s roundup focuses on preventing unwanted species from moving between waters. Two government reports show why early detection and careful equipment handling matter, followed by a standing reminder for anyone who keeps aquatic moss balls.
Another summer inspection blitz near Ontario
August 4 · Fisheries and Oceans Canada. Federal and Manitoba teams reported results from July 17–19 inspections near the Manitoba–Ontario border. They inspected 616 watercraft or pieces of related equipment; 137 failed clean, drain and dry checks, and 15 required decontamination. No visible zebra mussels were reported in that blitz. The difference from July’s earlier report is a reminder to read each inspection result on its own terms. For hobbyists who also boat, fish or maintain outdoor ponds, keep wet gear from carrying plants, animals or water between sites.
Read the August federal report (August 4, 2026).
Young silver carp found farther upstream in Illinois
August 14 · Illinois Department of Natural Resources. Monitoring crews removed several hundred young silver carp from the Illinois River’s Marseilles Pool, about 80 miles from Lake Michigan. Illinois officials said young fish of this size had not previously been recorded so far upriver during the monitoring program that began in 2010. The agency is investigating where spawning may have occurred; this report does not say the fish have reached Lake Michigan or Ontario. It shows why prevention and monitoring upstream of the Great Lakes matter to fishkeepers who care about native aquatic ecosystems.
Read the Illinois agency release (PDF) (August 14, 2026).
Plantkeeping reference: inspect moss balls
Standing federal advisory. Fisheries and Oceans Canada warns that zebra and quagga mussels have been found in moss ball products sold in Canada and provides disposal instructions. This is not a newly announced August incident. If you purchase moss balls or move plants among aquariums, inspect them carefully and follow the federal guidance if you suspect contamination; do not place suspect plants or water outdoors.
Read the Fisheries and Oceans Canada advisory.
TEAS takeaway: Prevent movement between habitats, check plants and wet equipment, and verify the source before sharing a dramatic invasive-species claim.