212 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Port Aransas 

 Texas 



5- 



4-- 



l jetty) 



Littorina 



V- 



3->_ 



:&■- 



Chtharnalus 



2- 



EHW 



West Summerland 

 Key, Florida 



(se-awall) 



-5' 



1.-. 



•^.:-.-*- 



-3* 



-«3- 



Littorma 



-z 



1- 



Cs pflr be) I 



I 1- 



TiDE Oysters & Ulva /\ 



0- ~~-.^ I 0- 



Red olqak ~~ }-• ^ 



-1 



1- 



£/.;«' 



2- Sponqes, bryo'^oa. g- 

 ArbociQ. iiC 



Beaufort, No. Car. 





-3 



( BL A C K 



-2 



1- 



-0. 



Chthamalus—tf 



A- 



^•^ ^ I 0- 



-!■ 



Alqae 



I 



-1 



£/-«^i- 



Corals 



-0 



-1' 





•'■7 (jetty) 



-5' 



(BLACK) 



Uttorina 



-\ 



Cht)iamalus -j 



£HW 



Oysters 4 

 Ulva 



Mussels 



-z 



Aiptosia, Alqoe, 

 Arbocm 



=*-^TIDE 



ZERO 



£/.V/ 



-r 



Figure 54. — Pattern of distribution of organisms on jetties and sea wall in Port Aransas, Texas, West Summerland Key, 



Florida, and Beaufort, North Carolina. 



The preceding description applies principally to 

 the grounds frequented by the commercial shrimp, 

 Fenaeus setiferus. The recent change in the 

 shrimp fishery toward exploitation of the popula- 

 tions of the brown or grooved shrimp, P. aztecus, 

 has revealed some differences in the constitution 

 of the bottom communities frequented by P. 



aztecus. Renilla is no longer charactpristic, but 

 one of the Astropectens is abundant, and two 

 bivalves, Pitaria cordata and Chione clenchi, are 

 much more abundant than they are closer inshore 

 on the P. setiferus grounds. The principal region 

 occupied by the pink shrimp, P. duorarum, is near 

 Key West across the Strait from Campeche Bank 



