KROUSE DISTRIBUTION OF JONAH AND ROCK CRABS 



mud bottoms. Distribution of both cancrid crabs 

 appears to be controlled by substrate type, depth, 

 and temperature. 



Male Jonah crabs outnumbered females in the 

 catch in July; the opposite occured in August and 

 September; during the remaining months, sex 

 ratios did not differ significantly from 1:1. In com- 

 parison, female rock crabs generally predomi- 

 nated July through September, during fall most 

 ratios approximated 1:1, and in winter and spring 

 males usually dominated with the exception of 

 most estuarine locations where males were only in 

 the majority during May. 



ACKNOWLEDGMENTS 



I thank the many summer assistants who 

 helped collect, compile, and tabulate several years 

 data. I also thank Joel Cowger for providing me 

 wdth his field data and Clarence Burke for drafting 

 many of the figures. 



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