68 78 88 98 108 118 128 138 148 158 168 178 

 63 I 73 I 83 I 93 I 103 | 113 | 123 | 133 | 143 r 153 i 163 I 173 . 183 



•- 6 

 Z5 



I 73 I 83 I 93 I 103 l 113 I 123 l 133 l 143 | 153 i 163 I 173 . 

 I ' I I I ■ I I I I I' I I I I I ' I I I I I 



I I ' I I I I I I 



I I ' I I I I I I 



MAY 

 ■ 22 MALES =31.5%. 

 48 FEMALES =68 7% 



\ 



y 



\/~ 



I ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 



/• 



JUNE 

 \_ — 163 MALES =39.8%_ 

 V^^ \ --245 FEMALES =599% 





/-' 



-'■y 



\ 



I I I ' I ' I ' I I I ' I ' I ' I ' I I I ' I ' 



/\ JULY 



// 





496 MALES =45.7% 



--589 FEMALES =54.3 %_ 



I ' I ' I ' I I I ' I I I ' I I I I I I I I I ' 



\ -' 



AUGUST 

 60 MALES =55.0% _ 

 375 FEMALES=44.9% 



Xa, 



I I I I I I I I I I I I I I I > I I T' I f 



175 MALES =57.9%_ 



-- 127 FEMALES •42 .2% 



3 

 2 - 



UJ 



"I I ' I I ' I ' I ' I ' I ' I ' I I I ' I ' 



63 ' 73 ' 83 ' 93 ' 103 ' 113 ' 123 ' 133 143 ' 153 ' 163 ' 173 ' 183 

 68 78 88 98 lOS 118 128 138 148 158 168 178 



TOTAL LENGTH (MM.) 



Figure 10. — Size distribution and sex ratios of brown 

 shrimp on northeast Florida outside fishing grounds, 

 by month. May to September, 1933-35. 



reassess the location and stocks of large 

 brown shrimp, the population was widely 

 scattered and catch rates were below com- 

 mercial levels. 



The BCF Exploratory Fishing and Gear 

 Research Station, Brunswick, Ga., furnished 

 samples of shrimp from a number of Oregon 

 trawl hauls of the March 1965 cruise, made 



between 18 and 24 m. (10-13 fathoms), and 

 from a series of hauls nnade between 55 and 

 66 m. (30-36 fathoms). Table 5 gives data for 

 these samples. At 20 to 24 m. (10-13 fathoms), 

 the pink shrimp was the abundant species (only 

 two brown shrimp were taken), whereas at 55 

 to 66 m. (30-36 fathoms) the brown shrinnp 

 was dominant (only five pink shrimp were 

 among the samples). From the size ranges 

 provided in table 5, it is evident that these 

 offshore grounds between 55 and 66 m. (30-36 

 fathoms) have a population of adult brown 

 shrimp of a general size much larger than 

 that of shrimp on the shallow coastal fishing 

 grounds, where the depths are under 18 m. 

 (10 fathoms) and largely under 15 m. (8 

 fathoms ). 



Whether the population of large brown 

 shrimp on the deep offshore grounds near 

 Cape Kennedy, Fla., is recruited entirely 

 from the shallow coastal fishing grounds of 

 Florida or receives recruits from the Caro- 

 linas and Georgia is largely speculation. Sev- 

 eral observations, however, support the latter 

 possibility: (1) the Florida population of large 

 brown shrimp on the deepwater grounds, far 

 beyond the shallow coastal grounds, is the 

 only such concentration ever located along the 

 south Atlantic coast, (2) the sumnaer popula- 

 tion of inshore brown shrimp from the Caro- 

 linas to northeast Florida disappears from the 

 shallow coastal shrimp grounds by September 

 or October and does not return, and (3) since 

 the closely related white shrimp n-iigrates in 

 the fall from North Carolina, South Carolina, 

 and Georgia to northeast Florida (Lindner and 

 Anderson, 1956), the brown shrimp might 

 certainly do likewise. 



Since 1965 there has been intermittent fish- 

 ing on the offshore grounds for large brown 

 shrimp. 



Ovary development .-- Table 6 gives data on 

 ovarian development for the brown shrimp for 

 outside grounds of the shallow coastal fishery 

 for June through September. 



The few females captured in May were all 

 undeveloped; in June, all females were un- 

 developed, except for two in the developing 

 stage; in July, 91.3 percent were undeveloped, 

 7.7 percent were developing, and 1.0 percent 

 were yellow; in August, 92.9 percent were 

 undeveloped, 5.4 percent were developing, and 

 1 .7 percent were yellow; and in September, 

 65.3 percent were undeveloped, 24.3 percent 

 developing, 4.0 percent yellow, and 6.4 per- 

 cent were ripe without attached spernnato- 

 phores. The smallest shrimp with developing 

 ovaries was 113 mm., yellow 133 nnm., and 

 ripe 143 mm. 



Joyce (1965), in his survey of the northeast 

 Florida shallow outside fishing grounds during 

 July 1962 to June 1963, found that all females 

 in May were undeveloped except for one, which 



