Diel Fluctuations in Catch of Postlarval Brown Shrimp, Penaeus Aztecus Ives, with the Renfro Beam Trawl
Abstract:From June 7 through June 11, 1965, two semicircular tows of 100-ft radius (one clockwise and one counterclockwise) were made with the Renfro beam trawl every 2 hours, over a 96-hour period. The sampling site was a tidal flat adjacent to the shoreline of the Gulf of Mexico at Cheniere la Croix, Louisiana. Of the 11,064 postlarval shrimp collected during the sampling, 2088 were identified to species: 1787 (86 per cent) as brown shrimp, Penaeus aztecus Ives; 301 (14 per cent) as white shrimp, P. setiferus (Linnaeus). The individual sample catches (especially the larger ones) were dominated by brown shrimp. Six major peak catches of postlarvae per tow were observed during the 96-hour period. Four of these occurred on June 7 and June 9: one on each afternoon (at 1400) and another each day about 1 hour after dark (at 2000). These four catches were made when the semidiurnal tide was relatively high. The afternoon peaks were associated with increasing temperature of the water, whereas the peaks after dark occurred as water temperature was decreasing. The remaining two major peaks, observed in daytime after severe squalls, were associated with decreases in water temperature. There was no significant difference between frequency distributions of day and night catches of post-larvae.
Document Type: Research Article
Publication date: September 1, 1970
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