Our vet says if you are near any stagnant water, a lepto vaccine is extremely important. He says if you never have any stagnant water, it is not a critical vaccine.
Some plants prefer flowing water, while others, such as lotuses, prefer stagnant water.
Various anaerobic bacteria are commonly found in stagnant water. For this reason, pools of stagnant water have historically been used in processing hemp and some other fiber crops, as well as linden bark used for making bast shoes. Several weeks of soaking makes bast fibers easily separable due to bacterial and fermentative processes known as retting.
Denitrifying bacteria
Leptospira
Purple bacteria (both sulfur and non-sulfur)
Fish
Lepisosteidae (gar)
Northern snakehead fish
Pygmy gourami
Siamese fighting fish
Spotted barb
Walking catfish
