Abstract

Two sizes of juvenile red swamp crayfish (Procambarus clarkii) were tested to determine the short term tolerance to abrupt changes in dissolved oxygen. Crayfish, 9-12 mm total length, were less tolerant to abrupt changes in oxygen than larger crayfish, 31-35 mm total length. The LC₅₀ value for 96 hrs for 9-12 mm crayfish, was estimated to be between 0.75 ppm and 1.10 ppm oxygen, whereas 31-35 mm crayfish had an LC₅₀ value for 96 hrs of 0.49 ppm oxygen. Crayfish, 31-35 mm, in ecdysis, appeared more susceptible to low oxygen than those in other stages of the molt cycle.

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