Chemistry and Sea-Water Laboratories 



Kenneth T. Marvin Supervisory Chemist. 



Raphael R. Proctor, Jr Chemist 



Larence M. Lansford Technician 



James Wallett Technician 



Albert L. Kudelka Summer Trainee 



Galveston 

 Do. 

 Do. 

 Do. 

 Do. 



Library 



Stella Breedlove 



Shirley J. Chatmon , 



Librarian , 



Summer Trainee , 



Galveston 

 Do. 



Technical Services 



Ruth W. Yanch , 



Petronila C. Prado , 

 Elizabeth C. Kilian , 

 Laura M. Hernnann , 



Daniel Patlan , 



Margie L. Watson.., 



Secretary Galveston 



Clerk-Stenographer Do. 



Clerk-Stenographer Do. 



Museunn Technician (Nat. Sci.) Do. 



Office Draftsman Do. 



Clerk-Stenographer (resigned 4/65) Do. 



Administration and Maintenance 



Raynnond H. Niblock. 



Glo S. Baxter 



Corinna L,. Denbo .... 

 Alvin M. Reynolds ... 

 Peter M. Villarreal . 



Tidas C. Alcorn 



Robert L,, McMahon . 

 William D. Muir 



Administrative Officer 

 Administrative Clerk .. 



Purchasing Agent 



Supply Clerk 



Maintenance Foreman. 



Maintenance man 



Maintenance man 



Sumnner Trainee 



Galveston 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



SHRIMP BIOLOGY PROGRAM 



Research of the Shrimp Biology Program is 

 designed to provide an understanding of the 

 life history of commercially important shrimp. 

 Sound nnanagement practices can then be 

 established to ensure full utilization of this 

 valuable resource. 



During fiscal year 1965, research cruises 

 were made in the waters over the north- 

 western Continental Shelf of the Gulf of 

 Mexico between the Mississippi River and 

 Brownsville, Tex, Each month, biological and 

 hydrological measurements were obtained at 

 41 sta1;ions, ranging in depths fronn 4 to 60 

 fath. At each station, sampling procedure 

 entailed making a 20-min. plankton haul with 

 a Gulf-V plankton sampler and obtaining tem- 

 perature and salinity measurements at various 

 depths. One-hr. tows with a 45-ft. shrimp trawl 

 were made at selected stations, and drift 

 bottles were released during several months. 

 We also made shorter cruises to obtaingravid 

 shrimp for experimental rearing of the larvae 

 and to measure water currents (fig. 1). 



One of our major problems has been to 

 identify larval shrimp in plankton samples; 

 therefore, we have spent considerable effort 

 in attempting to rear shrimp of known parent- 

 age and accurately describing each stage. 



During this past year, we made a major ad- 

 vancement when brown shrimp ( Penaeus 

 aztecus ), pink shrimp (P. duorarum ), and 

 Trachypeneus similis were successfully reared 

 to postlarvae. Further advancement was made 

 toward developing a mass culture technique 

 for shrimp. Two species of penaeid shrimp 

 were reared in mass culture, to which, in 

 addition to food, the only additive was dis- 

 odium salt of the metal chelator E.D.T.A. 

 (ethylenediaminetetraacetic). 



In conjunction with the study of plankton- 

 stage abundance and distribution, we con- 

 tinued investigating the possibility that post- 

 larvae of the Penaeus species concentrate on 

 the bottom before they move into nursery 

 areas. By nnodifying a Clarke- Bumpus 

 sampler ^ and mounting it on a sled, we were 

 able to collect plankton samples within 5 to 6 

 in. of the bottom. Our search for postlarval 

 Penaeus , however, was unsuccessful. Analysis 

 of regularly collected plankton samples con- 

 tinued, and 2 yr. of comparable data are now 

 available. 



'Trade names are used in this report for identification 

 only. Their appearance does not Imply endorsement by 

 the Bureau of Commercial Fisheries. 



