About 90% of fish found dead along stretches of the Mississippi River were invasive silver and bighead carp, while native species are handling the harsh conditions better

Hundreds of dead fish have washed up along the Mississippi River in Missouri and Illinois, but wildlife officials say the die-off may benefit the ecosystem. About 90% of the fish found at one Missouri site were invasive silver and bighead carp. Warm temperatures, low water levels and reduced oxygen appear to have caused the deaths.