RADTKE and DEAN: INCREMENT FORMATION OF OTOLITHS OF MUMMK'HOO 



Figure 2.— Light micrograph of a Fundulus heteroclitus sagitta on the day of hatching. C is the core 

 and II and 12 are increments formed after core formations but prior to hatching. Bar = 0.05 mm. 



sample of three eggs was taken after day 14 to 

 determine the events in otolith development. 



Sagitta were removed from 10 larvae of each 

 group according to the above schedule and photo- 

 micrographed. 



LARVAE: 



Developing embryos were maintained at 24°C 

 in L12:D12 in hatching jars with running sea- 

 water (30'/..). Upon hatching, the larvae were di- 



205 



