SAKAGAWA and KIMURA: GROWTH OF LABORATORY-REARED ANCHOVY 

 I30|- 



8 10 12 14 16 18 20 22 



AGE (months) 



Figure 3. — Growth of northern anchovy reared in the laboratory. One- phase (broken Hne) and two-phase (soHd 

 hne) Gompertz growth models are used to describe the data. Data from Schumann-II (Kramer and Zweifel 1970), 

 Schumann-Ill, and Leong (unpubl. data. Southwest Fisheries Center, La Jolla, Calif.). The mean (circle), one 

 standard deviation on each side of the mean, and sample size are shown. Broken line is described by L , = 2.825 exp 

 {3.623 [l - exp (-2.877^]} and solid line by L, = 2.745 exp {3.563 [l - exp (-0.848t)]} for t «11 mo, andL,, .11,= 

 96.782 exp {0.213 [l -exp (-0.258 {t - ll})]} for Oil mo. 



two-phase Gompertz model (Zweifel and Lasker 

 see footnote 2) was fitted to the data. The two- 

 phase model is essentially two separate Gompertz 

 equations that describe different segments of the 

 growth curve. The equations were fitted simul- 

 taneously and the convergence point of the equa- 

 tions was determined on the basis of least squares 

 analysis. Our best fit of the data was with the 



equation, L, = 2.745 exp {3.563 [l - exp 

 (-0.848n] } for growth from hatching to 11 mo of 

 age and the equation, L(,.ii) = 96.782 exp {0.213 

 [1 - exp (-0.258 {t - 11 })] } for growth from 11 to 

 20 mo of age (Figure 3). From the equations, the 

 estimated average length of anchovies after 1 yr 

 of hfe is 101.6 mm and after 2 yr of life, 118.9 mm 

 (Table 3). 



275 



