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Effect of p, p' -DDT on developmental stability of pectoral fin rays in Leuresthes tenuis

abstract1 (full description below): Fishery Bulletin 71:921-926.

Abstract. Experiments are described that test the validity and utility of using bilateral asymmetry for the early detection of environmental deterioration. The first experiment, using a continuously flowing water system, was designed to test the effects of a ubiquitous pollutant, p,p'-DDT, on the pectoral fin ray asymmetry of grunion, Leuresihes lenuis, fry. Toxicant concentrations ranged from a low of 0.001 to a high of 500 parts per billion. The two highest p.p'-DDT concentrations, 100 and 500 parts per billion, proved lethal to grunion fry. For the other concentrations, increases in pectoral fin ray asymmetry with increasing toxicant concentration were observed. Increases in asymmetry were statistically significant. The second experiment, which utilized a recirculating static water system, was designed to determine inherent differences in the level of pectoral ray fin asymmetry in fish from different localities. Results for grunion fry paralleled previously published results for adult grunion. Grunion from the relatively polluted southern California region had higher asymmetry levels than did those from Baja California. The significance of these results as they relate to the general question of asymmetry as a statistical indicator of environmental stress is discussed.