. Commercial fisheries review. Fisheries; Fish trade. October 1954 COMMERCIAL FISHERIES REVIEW not grooved) have a wider depth range. Although there are many instances, partic- ularly at dawn and at dusk or in muddy water, when both species may be taken in a single drag, brown-grooved shrimp are usually caught in night drags while white shrimp are taken in the daytime. A few pink-grooved shrimp are found in the west- ern Gulf of Mexico, and the range of the brown-grooved shrimp may extend into the eastern Gulf, but the commercial importance of these out-of-range shrimp is not known, perhaps be
. Commercial fisheries review. Fisheries; Fish trade. October 1954 COMMERCIAL FISHERIES REVIEW not grooved) have a wider depth range. Although there are many instances, partic- ularly at dawn and at dusk or in muddy water, when both species may be taken in a single drag, brown-grooved shrimp are usually caught in night drags while white shrimp are taken in the daytime. A few pink-grooved shrimp are found in the west- ern Gulf of Mexico, and the range of the brown-grooved shrimp may extend into the eastern Gulf, but the commercial importance of these out-of-range shrimp is not known, perhaps because of the limited observations of fluctuating availability. Brown-grooved shrimp have been taken in 85 percent of all exploratory drags made by the Oregon in depths of 10 to 70 fathoms between Cape San Bias, Florida, westward and southward on the con- tinental shelf to Carmen, Mexico. During 1950-51 the Oregon trawled all major unfished potential brown- grooved shrimp areas in the Gulf. In 1952-53 repeat coverage was carried out in the same areas at different seasons. Coverage of many areas during the December- February period is incomplete due to severely curtailed fishing opera- tions caused by unfavorable weather, although most of the good trawling bottom has been worked in several seasons. The area that has repeatedly yielded the highest catch rate of brown-grooved shrimp lies in the 30- to 45-fathom depth range be- tween 88° and 90° west longitude on both sides of the Mississippi Delta. These grounds were reported by Springer (1951) after initial explorations in the fall of 1950 produced heavy catches at rates up to 315 pounds per hour. These high catch rates were obtained on grounds not previously fished. Radiotelephone reports to the nearby shrimp fleet on September 15 announcing that the Oregon had taken 2, 700 pounds of 12- to 16-count shrimp (heads on) the preceding night resulted in immediate exploitation of the grounds. By the end of 1951 the commercial fleets
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