Zeldis et al.: Development of Hoplostethus atlanticus eggs in the water column 



385 



on egg size, egg density, temperature dependent de- 

 velopment rates, and water column density and tem- 

 perature structure. 



This study appears to be the first to model the 

 depth-specific development rate of teleost eggs. Or- 

 ange roughy eggs also appear to have the deepest 

 distribution of any eggs for which a development rate 

 has been studied in detail (see literature summary 

 in Page et al., 1989); most studies have concerned 

 continental shelf dwelling stocks. These two points 

 are probably related, in that it is probably not im- 

 portant to model depth-specific development rate for 

 eggs that are spawned in shallow water where the 

 water column is either completely mixed or has a 

 relatively small vertical thermal gradient (e.g. 

 Coombs et al., 1985; Page et al., 1989). However, if a 

 shelf-dwelling stock spawns near the bottom in strati- 

 fied waters (e.g. in summer) and if the eggs are small 

 and rise slowly, the development rate of the younger 

 stages of these eggs might be variable with depth to 

 an extent sufficient to significantly affect egg pro- 

 duction estimates. 



Acknowledgments 



The authors thank the officers and crew of RV 

 Tangaroa and J. P. Ots for technical assistance, and 

 I. J. Doonan and R. I. C. C. Francis for statistical 

 assistance. 



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