CROSS: FIN EROSION AMONG FISHES 



NO. WITH FIN EROSION 



160 



TOTAL CATCH 



PROP WITH FIN EROSION 



Figure 5. — Quarterly seasonal trends in the total catch of Dover sole, Microstomas pacificus, the number of individuals with fin 

 erosion, and the proportion of individuals with fin erosion collected at 61 m and 137 m at T4 and T5 from 1979 through 1982. Quarter 1 

 = Jan.-Mar, 2 = Apr. -June, 3 = July-Sept., 4 = Oct.-Dec. 



Table 7. — Linear regressions of the deseasonalized A) total catch of Dover 

 sole. Microstomas pacificus, in one 10-min trawl [transformed to logio ix + 1) ], 

 B) number of Dover sole with fin erosion [transformed to logio ix + D], and C) 

 proportion (p) of Dover sole with fin erosion (transformed to arcsin \p) re- 

 gressed against time (numbered in consecutive quarters from 1979 through 

 1982). See Table 2 for explanation of column headers. 



Station 



a +bt 



LI 



L2 



Weight-Length Relationships 



The Mearns and Harris data were examined for 

 differences in the weight-length relationships 

 among males and females with and without fin 

 erosion. There were no significant differences in 

 the regression coefficients between males with 

 and without the disease (T12 = 1.587, df = 38, 

 0.10 <P < 0.20) and between females with and 

 without the disease (Tja = 0.508, df = 56, 

 P > 0.50) (Table 8). There was a significant differ- 

 ence between males and females without the dis- 

 ease (T12 = 3.189, df= 64, 0.002 <P < 0.005), but 



not between males and females with the disease 

 (T12 = 0.713, df = 37, 0.20 <P < 0.50). 



Table 8. ^Results of the geometric mean regression of log 

 w = logo + b (log/), where u) = weight and / = length, for male 

 and female Dover sole with and without fin erosion. LI = lower 

 limit of 95'7f confidence interval of the regression coefficient (fe); 

 L2 = upper limit. 



Fin erosion 



log w = loga + b (log/) 



LI 



L2 



Males without log w = -4.514 + 2.864 (log /) 2.663 3.065 



Maleswith log iv = -4.994 + 3.114 (log/) 2.852 3.376 



Females without log iv = -5.564 + 3.310 (log/) 3.116 3.504 



Females with log iv = -5.379 + 3.234 (log/) 3.002 3.466 



201 



