Swimming Eidurnnce and Resistance to Copper and Malathion of Bluegills Treated by Long-term Exposure to Sl~hlethnl Levcls of Hydrogen Sulfide1

After 126 or 14.8 days of expoaura to H S concentrutionti rnnyiny from .OM4 to ,0140 r n ~ / I , young-of-the-yenr bluegills wcrc tcstcd for swimming endr~rancc and reeistancc to copper or malathion. Swimming tcsts nt low apecd~ indicated increaaed endurnnce for fieh exposed to .0004 mg/l H 3 , but fish expoaed to highcr concentration8 had prngrrssively less cndurmcn than the co11trols. In tho tcsts conducted at higher apeeda fiah in dl test concentrntions ahowcd lcss cndurnnw than the controls. Resistnnce to copper was increased hy exposure to H S , hut renistnnce to rnalntllion wan not affected except in the lowest lent concentrution. Thc clxonic cxposuru to H,S also reduced growth in tho highest concentration, and gill irrigation rate increased progressively with increaaed concentrutions.