Effect of Calcium Sulfide on Chironomus riparius (Diptera: Chironomidae) Egg Hatchability

Abstract
Egg masses of Chironomus riparius Meigen were tested in graduated aqueous solutions of CaS, ranging from 1–100 mg/l. Results showed that the number of unhatched eggs/given sulfide concn fit an exponential function of the form y = a ebx. The median lethal tolerance at 72 h after oviposition (TLm, 72) was established at 9.15 mg sulfide/l.

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