FISHERY BULLETIN: VOL. 86, NO. 2 



Georges Bank during the springs of 1981, 1983, 

 and 1984 and the summers of 1984 and 1985. 

 Sample dates and station locations where larvae 

 and juveniles were collected for otolith analysis 

 are given in Table 1. The samples were collected 

 with either 1) a continuous double-oblique haul 

 using a 61 cm bongo net sampler (0.505 and 0.333 

 mm mesh) deployed to a maximum depth of 100 m 

 (Posgay and Marak 1980), 2) a 1 m MOCNESS^ 

 fitted with nine 0.333 mm mesh nets which sam- 

 pled discrete vertical strata from the bottom of 

 the water column to the surface, 3) a 10 m MOC- 

 NESS (3 mm mesh) with five nets fished in the 

 same manner as the 1 m MOCNESS (Wiebe et al. 

 1976, 1985), or 4) a Yankee 36 otter trawl towed 

 for 30 minutes (Grosslein 1974). Stations with 



high densities of Atlantic cod and haddock larvae 

 and juveniles in good condition were selected dur- 

 ing the cruises for otolith analysis. The fish were 

 removed immediately following the haul and pre- 

 served in 95% ethanol. 



In the laboratory, larvae and juveniles repre- 

 sentative of the entire size-range collected were 

 selected for analysis. The standard length, as well 

 as several other morphometric measurements of 

 each larva or juvenile, was measured to the 

 nearest 0.1 mm prior to removal of their otoliths. 

 The 2 sagittae, 2 lapilli, and, when possible, 2 

 asterisci were dissected from the fish and, except- 

 ing juvenile sagittae, mounted whole on micro- 

 scope slides with Permounf*. The growth incre- 

 ments (Fig. lA) on most of these otoliths were 



^Multiple Opening/Closing Net and Environmental Sensing 

 System. 



''References to trade names do not imply endorsement by the 

 National Marine Fisheries Service, NOAA. 



Table 1 . — Station information for Atlantic cod and haddock specimens collected for otolith analysis by 61 

 cm bongo net (0.505 mm mesh) oblique hauls (6B5), 1 m MOCNESS (0.333 mm mesh) discrete vertical 

 hauls (1M3), 10 m MOCNESS (3.0 mm mesh) discrete vertical hauls (10M), and Yankee 36 otter trawl 

 (Y36) duhng the 1981, 1983, and 1984 survey seasons. 



224 



