Good morning, Dorothee 🙂
I regularly see “waterjuffers” (smaller libelles/dragonflies) by the tiny ponds in my back garden, so I am at more risk than you are for getting them if I collect mosquito larvae. 🙁
I am aware of the risks of overfeeding Grindal worms (Enchytraeus buchholzi). Microaaltjes are a kind of nematode:
http://www.livefoodcultures.com/microworms_printversion.html
While searching for information, I found this helpful site:
http://www.waterwereld.nu/microaaltjes.php
After looking at the chart on that site, I learned that microaaltjes have an even higher ratio of fat to protein than grindal worms! So my previous questions are now answered. :blush:
Kind regards,
Jonette