Parece que as tilapias vietnamitas nascerem e crescerem no esgoto não é nada de mais... engraçado, anyway.
There was a growing recognition that sewage should be treated; one common indicator of adequate treatment methods was that trout are able to live in the treated water.
Use of sewage requires frequent sediment removal from ponds if productivity is to be maintained which is labor intensive but is currently a cost effective method to both produce a value-added crop and, in the process, treat human waste.
Realizing the benefits of tilapia as a source of protein and income for the rural poor, and as a potentially lucrative export commodity, the Vietnamese government is now actively promoting tilapia production through activities under their Fisheries Master Plan. --> Acharam um parceiro no BRICS pra escoar a produção do Plano Quinquenal Comunista.
over 90 such systems existed in Germany in the early 20th century. Up until the 1990s, the city of Munich still processed most of its wastewater through fish farming.
Incidentally, today, massive seaweed production off the coast of China has likely greatly reduced the likelihood of eutrophication
eutroficação quer dizer: esgoto alimenta algas que consomem oxigênio da água, matando tudo. No caso, os peixes comem o esgoto e evitam as algas, mantendo o rio limpo.
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resilience
Urban Fish Ponds: Low-tech Sewage Treatment for Towns and Cities
In the mid 20th century, whole cities' sewage systems safely and successfully used fish to treat and purify their water. Waste-fed fish ponds ...
