From The Usda, A Higher Survival Rate For Cockroaches?
Science marches on: A U.S. Agriculture Dept. researcher has found a way to breed thousands of cockroaches with minimal time and effort. The key is to prevent cockroach cannibalism, which typically kills up to 95% of a brood, says Richard S. Patterson of the USDA Medical & Veterinary Entomology Research Lab in Gainesville, Fla. Some 400 female cockroaches are put in a box with a fine-mesh screen at one end. Their nymph offspring can get out, but the killer mothers are trapped inside. Since the nymphs are all the same age, they don't eat each other, either.
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