Shrimp Investigation - Biological Survey of Area M-8, Upper Laguna Madre

A 15-minute trawl was made at each of four shrimp stations twice monthly from September 1960 to July 1961. The white shrimp, Penaeus setiferus, was most abundant from September through November, with the largest catches being in November. These white shrimp entered the lagoon one month later in the fall of 1960 than they did in 1959. Grooved shrimp, Penaeus aztecus and P. duorarum, appeared in the fall and spring trawls of 1960-61 and at corresponding times in the 1959-60 season. However, grooved shrimp did not stay in the lagoon as long in 1960-61 as they did in the previous year. Sharp changes in salinity may account for the shorter grooved shrimp runs this year.