FISHERY BULLETIN: VOL. 80, NO. 3 



fecundity data for May and June (Fig. 10). The 

 egg-to-length relationship was Y- l,697.08e 002 

 X, where Y = number of eggs per fish and X = 

 length, r 2 = 0.39. The white perch analyzed had a 



Table 3.— Growth history of the white perch in the Hudson 

 River between Haverstraw and Bear Mountain, N. Y., 1963-69. 



mean fecundity of 50,678 eggs/female with a 

 range of 15,726-161,449. 



The relationship between ovary weight and 

 total body weight for 243 female white perch of 

 known age collected from May to October is 

 shown in Table 8. The changes in the ratio of 

 ovary weight to body weight expressed as a per- 

 centage shows that spawning took place during 

 June and was completed by July. Thereafter the 

 ovaries are refractory and do not regain their 

 weight until prior to the succeeding spawning 

 season. The occurrence of the spawning season is 

 further substantiated by the occurrence of white 

 perch eggs and larvae in ichthyoplankton during 

 June and July collections from the Hudson River 



Table 4.— Calculated growth of white perch males in the Hudson 

 River between Haverstraw and Bear Mountain, N.Y., 1963-69. 



Table 5.— Growth history of the white perch males in the Hud- 

 son River between Haverstraw and Bear Mountain, N.Y., 

 1963-69. 



(Lauer et al. 1974). 



Sex Ratio 



Of the 2,600 mature fish collected, 1,209 were 

 males and 1,442 were females, giving an overall 

 sex ratio of 0.83 to 1.0 in favor of females. This 

 phenomenon has been observed for other fish 

 populations in which females attain an older age 



Table 6.— Calculated growth of white perch females in the Hudson 

 River between Haverstraw and Bear Mountain, N.Y., 1963-69. 



606 



