FISHERY BULLETIN: VOL. 69. NO. 2 



off the Mississippi River Delta, stated, "Of spe- 

 cial interest was the discovery of high densities 

 of small red (Hymenopenaeus debilis) shrimp 

 in 208 fathoms. These shrimp averaged less 

 than 35 mm total length." These two species 

 of Hymenopenaeus are similar in shape to H. 

 robustus; consequently, we believe that small 

 H. robustus would have been taken in our gear 

 if they had been present on the fishing grounds. 

 We have no idea where they might be. 



The sex ratios for all the data combined show 

 A2.&'''r males and hlA'^'c females. Some, but 

 probably not all, of this difference is undoubtedly 

 the result of mesh selectivity. We observed no 

 indication of sex reversal in the species. 



Appendix Table 6 shows the length distribu- 

 tions in numbers of shrimp by sex for each 

 cruise. 



LITERATURE CITED 



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324 



