Dipstick, the excessive moisture is most likely killing them. I wouldn't add any moisture beyond that contained in relatively dry vegetables (carrots, potatoes, etc.). I live in one of the driest places on the planet, where humidity and annual rainfall are typically measured in single digits and my mealworms do very well. Your colony is most likely experiencing a fungal (entomopathogenic) or bacterial infection, which should run it's course once the moisture is removed.
BTW, welcome toand welcome to our mealworm thread. Oh, what kind of fish are you raising?![]()
I started with nearly no potato and nearly no moisture, and they died three times as fast as when I began to add moisture sources. That is why I did this. I will be cutting back to see if the problem goes away.
As for the fish, we plan on a combination of feeder goldfish as a distributor to pet shops as well as directly to the public, tilapia, possibly trout, and or blue gill or perch. We will have approx 4-5 300 gal tanks in a special set up for higher than normal population.