The relation between various hydrological conditions and their effects 

 on penaeid shrimp production are also presented. Comparisons are made 

 between the seven coastal areas in relation to life history functions 

 of the two species of penaeid shrimp investigated. 



Shrimp populations were sampled at all stages of development, from 

 postlarvae to adult, using specialized gear appropriate for a given 

 development state. Types of gear used were a 0.5-meter plankton net, 

 marsh sled, 6-foot otter trawl, 16-foot otter trawl, and wing nets. 

 From July 1969 to June 1972, over 4,000 biological samples, including 

 6-foot and 16-foot otter trawls (taken on a regular basis) were made 

 at 60 locations from the Sabine River on the west to the Pearl River 

 on the east. (A. A.) 



Keywords: shrimp, estuarine systems, life history, Louisiana 



IV-E-7 



Loesch, H., and J. Jacob. 1970. Shrimp sampling and preliminary results 

 in two small areas in Barataria Bay, Louisiana. Louisiana State 

 University, Coastal Studies Bulletin No. 5, Special Sea Grant Issue, 

 pp. 65-81. 



A low and a high shrimp production area in Barataria Bay, Louisiana, 

 were chosen for a study of the total ecology of these areas. Some 

 difficulties with sampling gear were encountered during the first year 

 of sampling. A shrimp trawl was used, and other gear are still being 

 tested. In May, the southern (high-producing) area had the greatest 

 population of brown shrimp (at least 1,000 per acre); in June, the 

 northern (low-producing) area had the greatest population of brown 

 shrimp. Growth was estimated to be 65 mm in 2 1/2 months. Monthly 

 survival rates were also calculated. White shrimp first appeared 

 in the area in early July but were less abundant than brown shrimp 

 had been. (A. A.) 



Keywords: shrimp, productivity, ecology, Louisiana 



IV-E-8 



Jacob, J., and H. Loesch. 1971. A preliminary two-year comparison of 

 Penaeus aztecus : growth rate, distribution, and biomass in the 

 Barataria Bay area, Louisiana. Louisiana State University, Coastal 

 Studies Bulletin No. 6, Special Sea Grant Issue, pp. 45-55. 



Growth rates of brown shrimp in the areas studied were somewhat 

 greater in 1969 than in 1970. This may be due mainly to the far greater 

 number of immigrating shrimp in 1970 than in 1969. John the Fool Bayou, 

 however, had approximately the same peak number of shrimp in both 1969 



181 



