Last weekend, there was an event called the “Environmental Net Festa” at our local Setagaya Park, so I went with the kids. It was like a small festival, with food stalls and a bazaar, but the highlight—or rather, the most unusual feature—was this particular activity.
The park’s pool was about to open for the season, which meant it needed to be cleaned. Unfortunately, that also meant that the dragonfly larvae (nymphs) that had been growing up in the pool would be wiped out. Apparently, dragonflies in the area have no other suitable places to lay their eggs, so they all end up here.
The event organizers had the idea of letting kids catch the nymphs with nets and buckets and take them home. We joined in mostly on a whim. Borrowing a net and a container, we tried scooping—and wow, there were plenty! We easily caught more than ten. We didn’t have clothes for going into the pool itself, so we just scooped from the poolside, but it felt like we could have caught many more if we’d gone in.
Then came the question of how to bring them home. We hadn’t brought any containers, so we went to a nearby convenience store, bought plastic salad containers, and had my wife eat the salad right there so we could use the containers for the nymphs. It had been a long time since I’d seen dragonfly nymphs in person—but clearly, if they’re around, they’re everywhere.
The kids were delighted, and we had fun too—this was a successful nymph-scooping adventure. But tragedy struck afterward. That evening, I went out to dinner with friends (as I mentioned in the previous post), so my wife brought the containers back home. Being squeamish about bugs, she left the containers on the balcony—and, of course, the next day the kids playing on the balcony knocked them over.
When I got home from work, all that was left was an overturned container full of mud and dragonfly nymphs that were either dying or had already perished. For them, it might have been better to just survive in the pool until the cleaning day came.
Incidentally, even if you raise these nymphs properly, only about one in ten actually survives to become a dragonfly—due to things like cannibalism or failing to molt properly.