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Fishery Bulletin 105(2) 



Figure 2 



Ovary stages of Greenland halibut t Rein hard tins hippoglossoides) from 

 histology. Ovary staging follows the methods of Gundersen (2003). All 

 scale bars = 1.0 mm. (A) Immature. (Bl Cortical alveoli. CAO = cortical 

 alveolar oocyte. (Cl Vitellogenesis 1. YG = yolk globules. (D) Vitello- 

 genesis 2. Note the lai'gest yolk globules are located near the nucleus. 



(E) Vitellogenesis 3. Note the yolk size gradient has been reversed 

 and the largest yolk globules are near the periphery of the oocyte. 



(F) Vitellogenesis 4. The yolk globules are all large and have begun to 

 fuse. (G) Spawning. (H) Spent. POF = postovulatory follicle. 



2003). To confirm this for Greenland halibut in the 

 Bering Sea, oocyte diameters were measured to deter- 

 mine if there is a hiatus in size between developing 

 and reserve oocytes. Mean diameters of nonvitellogenic 



and vitellogenic oocytes were measured from whole 

 oocyte tissue samples. All vitellogenic oocytes in a tis- 

 sue sample of known weight were counted. The oocytes 

 were placed in a dish on top of a sampling grid. All 



