Movements Of Brown Shrimp, Penaeus Aztecus, And White Shrimp, Penaeus Setiferus, Over Weirs In Marshes Of South Louisiana

The movements of brown shrimp (Penaeus aztecus) and white shrimp (P. setiferus) over weirs in a South Louisiana esturary were influenced by tides. Brown shrimp concentrations inside the weir were greatest on incoming tides, water flowing into the weired area. The incoming water stimulated brown shrimp to the weir. White shrimp concentrations inside the weir depended on water head differences between weired and outside waters. The head difference usually occurred with approaching cold fronts and drops in temperature. The shrimp catch was greatest at night.