Infestations of Epipenaeon elegans on Penaeus semisulcatus and Their Use as Biological Tags

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Abstract
General changes in the distribution of Penaeus semisulcatus infested by the bopyrid parasite Epipenaeon elegans in Kuwait waters agree with the migratory patterns deduced from the movements of tagged shrimp in Kuwait Bay in 1979. The growth rates of infested males appear to be accelerated by infestation and infested males are castrated by the parasite. Recruitment of infested and uninfested shrimp occurs mainly in May, June, and July. In some years, limited recruitment of uninfested shrimp occurs in October and November. The total mortality rate calculated for infested shrimp in 1978, when autumn recruitment did not occur, was not significantly different from the mean value calculated independently from 1979-1984 by means of the ELEFAN analytical method. For 1979, when significant autumn recruitment occurred, an aberrantly low value of the total mortality was obtained for infested shrimp. Studies of infested shrimp may provide insight into the migrations and mortality rates of uninfested shrimp in the Kuwaiti population of P. semisulcatus.

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