. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. MUNICIPAL OUTFALLS AND FLATFISH TUMORS 69 with an otter trawl towed along a depth isobath at m/s for 10 min. A (headrope length) otter trawl was used from 1971 to 1974 when it was replaced with a trawl; a mesh cod-end liner was used in both nets. Fishes were sorted from the catch by species and measured to the nearest mm standard length (sl) on a measuring board if there were few individuals or to the nearest
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. MUNICIPAL OUTFALLS AND FLATFISH TUMORS 69 with an otter trawl towed along a depth isobath at m/s for 10 min. A (headrope length) otter trawl was used from 1971 to 1974 when it was replaced with a trawl; a mesh cod-end liner was used in both nets. Fishes were sorted from the catch by species and measured to the nearest mm standard length (sl) on a measuring board if there were few individuals or to the nearest cm SL if there were many individuals. The presence of epidermal tumors was noted. LOS ANGELES HARBOR. FIGURE 1. Map of the transect stations on the Palos Verdes shelf. From 1971 through 1978, two samples were collected annually at each depth —one between April and June, the other between October and December. Additional trawls made at irregular intervals were included in the analyses. Quarterly trawling began in 1979 and has continued to the present. Trawling was discontinued at transects T2, T3, and T6 in 1977. Trends in the annual incidence of epidermal tumors from 1971 through 1983 were determined by linear regression of the proportion of fish with tumors against time for each transect. All trawls made within a calendar year at transects TO, Tl, T4, and T5 were pooled for each transect because of the low frequency of tumors in the M. pacificus population. Proportions (p) were transformed to the arcsin (p''') to make the data conform more closely to the assumptions of regression analysis (Finney 1973). Annual tumor frequencies of zero were re- placed by %n (Bartlett 1937). Time was coded as year of collection numbered consecutively from 1971 through 1983 (, 1,2,3, . ., 13). Trend analyses were performed on data for individuals less than 120 mm sl which accounted for of all tumorous M. pacificus (382) collected at transects TO, Tl, T4, and T5. According to the gro
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