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The views and opinions expressed or implied in this article are those of the author (or authors) and do not necessarily reflect the position of the National Marine Fisheries Service, NOAA. Abstract—Economic return was estimated for the stock enhancement of banana prawns (Fenneropenaeus merguiensis) released in waters of the Strait of Hormuz along the coast of Hormozgan Province in Iran. Of the 4.7 million juvenile banana prawns that were cultured and released during the period of June– July 2010, 50,000 were marked by injection with red fluorescent elastomer. During the fishing season in November 2010, 11 marked prawns were recovered (a recovery rate of 0.022%).The mean weight of marked prawns at release and recovery was 1.08 g (± standard deviation [SD] 0.1) and 22.06 g (SD 4.9), respectively, representing a growth rate that ranged from 0.88 to 1.41 g weeks−1. On the basis of the number of prawns released and the recovery rate, the shrimp catch in Hormozgan in 2010 was estimated to be about 1034 released prawns with a mean weight of about 22.80 kg. The production cost for 4.7 million prawns was USD 18,800, and the local market value of landed prawns was USD 3.440 kg−1. Therefore, the total value of the estimated 1034 landed prawns was USD 77.50, indicating a profit to production ratio of 0.0041. These results, particularly the percentage of recaptured prawns, shows that this type of release operation is not economically feasible. The development of the penaeid prawn trawl fishery along the Iranian coast of the Persian Gulf began in 1959 (Van Zalinge, 1984). Shrimp fishing activities by large-scale industrial fleets expanded rapidly, and technology later adapted to artisanal fisheries. Shrimp fishing effort along other Gulf countries soon followed: Saudi Arabia in 1963, Bahrain in 1966, Kuwait in 1967, and Qatar in 1969. Maximum shrimp landings reached 9600 metric tons (t) in Iran for the period of 1964–1965 and 3335 t for Kuwait in 1966–1967, and industrial landings reported by Saudi Arabia and Bahrain peaked at 7400 t in 1973–1974 (Van Zalinge, 1984). The period of 1959–1969 was a boom phase for the industrial shrimp fisheries that was characterized by high catch rates, increased landings, and the establishment of new companies. In the late 1970s, shrimp catches in the Persian Gulf declined dramatically, and, as a result of that decrease, several fishing companies ceased activities in 1979 (FAO1). In-

Economic valuation of stock enhancement of banana prawn (Fenneropenaeus merguiensis) in the Strait of Hormuz