Yes they would. Tilapia fries would definitely eat mosquito larvae in the water. There were likely smaller species like guppies that would totally keep the mosquitos in check.
Something I always wondered whenever I saw pictures of that mall is why was it abandoned. I've turned to google multiple times but there doesn't seem to be anything about it.
"Located in the city's Banglamphu district, Thailand's Supreme Court ordered a partial demolition of the shopping center in 1997 when judges determined that seven of the 11 floors were built illegally"
There have been other large retail collapses in Asia[1] so it is good to see this happen.
4th paragraph: "Located in the city's Banglamphu district, Thailand's Supreme Court ordered a partial demolition of the shopping center in 1997 when judges determined that seven of the 11 floors were built illegally."
If most of the floors were illegal to the point that the entire structure was ordered to be demolished, it sounds like they must have been fairly dangerous. Would you really want to shop in a building where 60% of the floors are potentially structurally unsound?
I am only guessing, but I think it is implied in the article: With the rainy weather common to southeast Asia and an open roof, the mall just became a basin of water, fantastic for breeding mosquitos. Unable to remove the water (or prevent water from entering), enterprising locals stocked the basin with fish to eat the mosquitos.