Abstract
Summary Although infestation of Penaeus semisulcatus by Epipenaeon elegans does not inhibit growth of the host, there is a drastic effect on reproduction. The gona-dosomatic index is ≤ 0.5 in both infected male and female shrimps. The petasma is not formed in the infected male shrimps. The ovaries remain small in infected females and the oocytes do not develop beyond primary vitellogenesis. If the parasite is lost the ovary of the host is activated and oocytes in vitellogenesis are observed. The testes in infected males are also reduced and few spermatozoa are formed. These findings are compared with other studies on parasitic castration in Crustacea.
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