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Host-Parasite Relationship of the Copepod Eye Parasite, Phrixocephalus cincinnatus, and Pacific Sanddab (Citharichthys sordidtis) Collected from Wastewater Outfall Areas





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The host-parasite relationship of Phrixocephalus cincinnatus and the Pacific sanddab, Citharichthys sordidus, was examined relative to season and distance from effluent discharge sites of wastewater treatment plants located off the coast of southern California. Pacific sanddabs were collected by otter trawl on a quarterly basis from waters off Los Angeles and San Diego. Infection with P. cincinnatus occurred in sanddabs ranging in size from 4.5-24.0 cm standard length. The prevalence of P. cincinnatus was higher on the Palos Verdes shelf (1.86%, measured from 1975 to 1995) and in Santa Monica Bay (1.34%, measured from 1989 to 1994) than off Point Loma, San Diego (0.54%, measured from 1992 to 1994). In 1995, prevalence of P. cincinnatus off San Diego increased to 1.90%. On the Palos Verdes shelf and off San Diego, prevalence of P. cincinnatus was highest in the winter and spring. In Santa Monica Bay, infection peaked during the summer months, and was highest at stations nearest to effluent discharge. Several new host records for P. cincinnatus are reported.