Abstract
INTRODUCTIONMainly distributed in the Bohai Sea and the Yellow Sea, Penaeus chinensis shrimpis of economic importance in both fishing and seafarming industries in China. Inrecent years, the sustainable development of the P. chinensis fishery industry hasbeen threatened by overfishing, viral epizootics, and habitat contamination. Aninvestigation of the genetic variation within this species may shed light on theprotection and genetic enhancement of the species.Very high genetic variation of mitochondrial cytochrome oxidase subunit I(COI)genehasbeenobservedinseveralspeciesofarthropods(Meyranetal.,1997;Navajas et al., 1998, 1999). In the genus Penaeus, although insufficient studies onmtDNA have been reported, large genetic variations of the COI gene have beendetected among 15 species (Baldwin et al., 1998; Palumbi and Benzie, 1991),and 0–3% COI variation was observed within somePenaeus species (Baldwinet al., 1998). High genetic variations of mitochondrial 16s rRNA gene have alsobeen observed within P. notialis, and between P. notialis and P. schmitti (Garcia-Machado et al., 1993). In this study, therefore, we sequenced COI and 16s rRNAgenes to investigate genetic variation in P. chinensis populations.
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