30° N, 



29°- 



28° 



29° 



28°- 



95° W 

 J 



MYSES 



POSTLARVAE 



Figure n. — Relative abundance and distribution of planktonic-stage t'l-iiacKf spp.. April to Aufrust 

 19(il. 



'r.\l)LK .5. -Ytuiiii ningc in bMom tciiij)erat(ir<s aii'l teinpera- 

 lurcx in which nnupliar stages ircrc taken in the northwestern 

 Gulf of Mexico in 1961 



each time period. Isopleths were then drawn 

 to delineate areas of planktonic-stage concen- 

 trations (figs. 5, 6, and 7). 



Slight shifts in the areal distribution of nau- 

 pliar, protozoeal, and mysis stages were appar- 

 ent. In January to March, larvae were restrict- 

 ed largely to waters deeper than 14 m. and 

 shallower than 82 m. ; in April to August con- 

 centrations were primarily shoreward of 46 m. ; 

 and in September to December, when the great- 



330 



DISTRIBUTION, SHRIMP IN GULF OF MEXICO 



