Lethal levels of dissolved oxygen for Haliotis diversicolor supertexta at different salinity levels

Abstract

The abalone Haliotis diversicolor supertexta juveniles (shell length 3.51 +/- 1.10 cm) were exposed to different concentrations of dissolved oxygen (DO) using the static renewal method at different salinity levels of 25%o (g kg(-1)) and 35parts per thousand at pH 8.04 and 22degreesC. The 72-, 84-, and 96-h LC50 values of DO on H. diversicolor supertexta juveniles were 1.56, 1.76, 2.02 mg L-1 at 25%o and 1.43, 1.65, 1.83 mg L-1 at 35parts per thousand, respectively. As the salinity decreased from 35parts per thousand to 25parts per thousand, susceptibility to DO increased by 107%, 107%, and 110% after 72-, 84-, and 96-h exposure, respectively. The relationship between LC50 of DO (mg L-1), salinity (S) and exposure time (T) in the range 72-96 h is as follows: