FISHERY BULLETIN: VOL. 83, NO. 3 



Table 3. — Regression analysis of 1976-77 Gulf of Maine Atlantic herring data based on two otolith 

 increment deposition assumptions. (Data from Lough et al. 1982.) 



Legend: Data were classified into early- and late-hatched larvae. Two dates of hatch were calcu- 

 lated: 1) Age equalled increment count plus a constant, and 2) age equalled twice the increment 

 count plus a constant. This resulted in a range of potential hatching dates. Any late-hatched larva 

 whose range of hatch date overlapped the division date (Text Fig. 1) was eliminated from the 

 analysis. 



Table 4.— Estimation of von Bertalanffy growth parameters for larval Atlantic her- 

 ring from the Gulf of Maine. 



LARVAL HERRING 



1978-1979 STUDY 



lU 



< 

 > 

 a. 



< 



QC 

 UJ 

 CD 



SEPT 1 



OCT 1 



NOV 1 



DEC 1 



SEPT 



OCT I NOV I DEC 



DATE OF HATCHING 



JAN 



Figure 5. -Frequency of Atlantic 

 herring hatching during the 

 1978-79 study. Upper scale gives 

 the day of hatch based on the Lough 

 et al. (1982) aging method as 

 discussed in the text. Lower scale 

 gives the day of hatch based on 

 Townsend and Graham's (1981) 

 aging method as discussed in the 

 text Arrow indicates division point 

 between early- and late-hatched 

 classification. 



294 



