Les vols des adultes ont été observés et les stades immatures ont pu être associés à au moins sept espèces de plantes aquatiques.

Translate this to English?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Observations were made of swarming adults, and the immature stages were associated with at least seven species of aquatic plants.