Thank you for this interesting tip Helene!
While collecting some larves in the garden bucket this evening, I recognised two so called things and have dropped one in a bowl with water from the bucket. I hope to get the same result as you in couple of days.
It usually takes me about 10-15 minutes to collect black mosquito larves: staring at the bucket and catching the ones that raise to the water surface :blink:
Would there be a method to stimulate them, showing up faster from the bottom towards the surface?
Best regards,
S.