FISHERY BULLETIN: VOL. 80, NO. 3 



Age- Frequency Distribution 



Total # Fish -5987 (July -November 1970) 



1970 Year Class --♦— 



969 " " — •— 



1968 " " — O— 



1967 " " --0-- 



1966 "  



1965 " " — a— 



1964 " " 135.0-174.0 



Total • • 



Standard Length (mm) 



FIGURE 5.— Age-frequency distribution of white perch during July to November 1970. 



Table 2. — Calculated growth of white perch in the Hudson River be- 

 tween Haverstraw and Bear Mountain, N.Y. (sexes combined), 

 1963-69. 



Length-Weight Relationship 



The length-weight relationship for Hudson 

 River white perch was calculated using the least 

 squares method (Ricker 1968). The relationship 

 for males was Log W= -2.262 + 1.925 LogL, r 2 = 

 0.706. For females, the relationship was Log W 

 = -4.738 + 3.099 Log L, r 2 = 0.965. The combined 

 male and female length-weight relationship was 

 Log W = -4.743 + 3.093 Log L, r 2 = 0.952. 

 The values of the exponents 1.925 and 3.099 

 indicate females were heavier than males of the 



same length (Fi, 20 = 4.97; a = <0.05). Graphically 

 expressed (Fig. 9), it can be seen that this 

 occurred for females over 140.0 mm (age group 

 2+ and older) and can be related to fatness and 

 gonad development (Le Cren 1951). 



Reproduction 



Sixty-five female white perch collected during 

 May and June (115.0 to 187.5 mm SL) and repre- 

 senting age groups 2 to 7 were analyzed for 

 fecundity. An exponential curve was fitted to 



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