STAGE I 



STAGE n 



STAGEm 



STAGE m 



STAGE Y 



STAGE YT 



HOURS 8 HOURS 23 HOURS 45 HOURS 72 HOURS 



4 DAYS 7 DAYS 7 DAYS 



7 DAYS 



8 DAYS 9 DAYS 



DEVELOPMENT AT 

 38 °F 



10 DAYS 12 DAYS 13 DAYS 



14 DAYS 16 DAYS 17 DAYS 



HADDOCK 

 18 DAYS 21 DAYS 



Figure 4.--Stages of development of haddock and cod eggs from fertilization to hatching. 



the gauzes were viewed with a specially designed 

 traversing stereonnicroscope using 1 OX mag- 

 nification (fig. 5). With this magnification it was 

 possible to cover a 2-inch section of the filter- 

 ing gauze and its corresponding section of 

 covering gauze with two traverses of the micro- 

 scope. 



All fish eggs and larvae were counted and put 

 in vials numbered similarly to the 2-inch gauze 

 section. All eggs, except those in very poor 

 condition, were then staged, nneasured, and 

 identified using a compound microscope. 

 Because the majority of the eggs were flat- 

 tened, exact measurements were impossible; 

 therefore, the sizes are not listed in the tables. 

 These measurements were used only for identi- 

 fication purposes. Some eggs in an extremely 



crushed condition were not staged. All larvae, 

 except the badly crushed specimens, were 

 measured and identified. The very small larvae 

 were measured to the nearest 0.01 mm. and the 

 larger ones to the nearest millimeter. Tables 

 8-10 contain the surface and 10-meter data 

 collected by the Hardy Plankton Recorders dur- 

 ing cruise nos. 46, 48, and 50. 



A track chart of the cruise was prepared, 

 showing time and position of each Loran fix, 

 locations of 1 -meter net tows, locations of 

 drift-bottle releases, and start and finish of 

 the recorder runs. 



The distance traversed for each 2-inch sec- 

 tion of exposed gauze was obtained by dividing 

 the total distance run by the number of 2-inch 



