The Impact of Aquaculture Pond Engineering Design on the Returns to Shrimp Farms     

Wade L.  Griffin Johannes A. D.  Lambregts  M. W. Yates    A. Garcia 《Journal of the World Aquaculture Society》1993,24(1):23-30

The effects of pond design on the internal rate of return of a 40 ha shrimp farm is evaluated. The influence of four pond construction parameters (pond size, pond shape, levee crown size and canal bank slope) on the total amount of earth moved and construction costs is determined using an engineering design model. The bioeconomic model, MARSIM, calculates returns to farms with the design modifications. Of the four parameters, the pond shape is the most influential over the range considered (from 17% to 8%). Pond size is the second most important parameter (from 17% to 21%). Levee width and canal bank slope influence are of lesser importance (<1% change).  相似文献   

Economic Evaluation of Different Stocking Densities for Various Sized in Texas     

Johannes A. D.  Lambregts  Sayra G.  Thacker Wade L.  Griffin 《Journal of the World Aquaculture Society》1993,24(1):12-22

There has been a trend toward intensification of shrimp farming in the U.S. FiCteen simulated farms were used to evaluate economies of scale and to compare three Penaeus vannclmei commercial production strategies: semi-intensive, intensive, and very-intensive. Large economies of scale were associated with each production strategy. Over the range of farm sizes considered, investment cost per hectare decreased approximately 50% and production cost decreased approximately 25%. Farms' returns were measured with Internal Rate of Return (IRR). When investment was greater than $0.75 million, the intensive strategy provided slightly better returns to the investor than semi-intensive or very-intensive strategies. At investment levels less than $0.75 million, the semi-intensive strategy provided the highest IRR.  相似文献