Transport in Somerset a harbour at Southampton. Hot springs were discovered near where the Fosse Way crossed the River Avon and the town of Aquae Sulis (now the city of Bath) developed there. Just a little further north the Fosse Way crossed a long road between London and Sea Mills. The waters of the Bristol Channel and rivers such as the Avon were used for transport. The small vessels in use at that time could navigate quite some distance upstream, indeed the River Yeo shows evidence of being straightened near Ilchester. Harbours were established near river mouths at Sea Mills (River Avon), Uphill
Aphanizomenon flos-aquae toxic chemicals released when cells die. Once released (lysed), and ingested, these toxins can damage liver and nerve tissues in mammals. In areas where water quality is not closely monitored, the World Health Organization has assessed toxic algae as a health risk, citing the production of anatoxin-a, saxitoxins, and cylindrospermopsin. Dogs have been reported to have become ill or have fatal reactions after swimming in rivers and lakes containing toxic "A. flos-aquae". Microcystin toxin has been found in all 16 samples of "A. flos-aquae" products sold as food supplements in Germany and Switzerland, originating from Lake Klamath: 10 of 16