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Applying An Index Of Fishing Effort To Estimate 1971 Costs And Returns For Gulf Of Mexico Shrimp Vessels
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1974
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Series: TAMU-SG ; 74-217
[PDF-387.60 KB]
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Description:Shrimp vessels operating in the Gulf of Mexico are heterogeneous with respect to physical characteristics. In this study, the investigators developed a more effective and useful method of classifying vessels for costs and returns analysis by the introduction of an index of fishing effort. This effort index is defined as the fishing power of any given vessel relative to the fishing power of a base or standard vessel. For evaluation purposes, a sample of 29 vessels was classified into four groups based on length and effort index. Groups I and II represented vessels from 52 to 56 feet in length with effort indices of 1.56 to 1.69 and 1.76 to 1.90, respectively. Groups III and IV represented vessels from 66 to 72 feet in length with effort indices of 1.78 to 2.04 and 2.10 to 2.28, respectively. Evaluations of these groups showed that among vessels of similar length the index of fishing effort was a determinant of profitability. Vessels with higher effort indices were more profitable. Among vessels of similar effort, larger vessels (length) were more profitable than smaller ones. Length was the greatest determinant of profit mainly because larger vessels could be operated in rougher weather and generally were commanded by a more experienced captain. The results indicate that the use of an effort index to establish relatively homogeneous groups of vessels for costs and returns studies, which are needed by the industry and by agencies responsible for management of the resource, constitutes an improvement over use of a classification based on a single criterion such as length only.
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