A series of bioassays were conducted to test the effect of H2S at two concentrations of oxygen on northern pike (Esox lucius L.) eggs and sac fry. At an oxygen concentration of approximately 2 ppm mean median tolerance limits (TLm) for eggs were 0.411, 0.076, 0.038, 0.034, and 0.030 ppm H2S for 24, 48, 72, 96 hours, and for the duration of the embryonic period, respectively. At an oxygen concentration of approximately 6 ppm mean median tolerance limits (TLm) were 0.181, 0.046, 0.041, 0.037, and 0.032 ppm H2S for 24, 48, 72, 96 hours, and for the duration of the embryonic period, respectively. Mean TLm values for sac fry were 0.035, 0.016, 0.012, and 0.009 ppm H2S at 2 ppm oxygen and 0.160, 0.047, 0.030, and 0.026 ppm H2S at 6 ppm oxygen for 24, 48, 72, and 96 hours, respectively. Eggs subjected to H2S resulted in increasing percentages of sac fry with anatomical malformations. Sac fry hatched from eggs held at the higher H2S concentrations were smaller than the controls. Sac fry subjected to H2S showed decreased growth rates at the higher concentrations. The maximum possible safe level of H2S for eggs is between 0.014 and 0.018 ppm and for sac fry between 0.004 and 0.006 ppm for 96 hours exposure.
|Original language||English (US)|
|Number of pages||9|
|Journal||Transactions of the American Fisheries Society|
|State||Published - Jul 1970|