Although the fisheries for, and mariculture of, penaeid prawns are of major commercial importance, there has been relatively little research undertaken on the chromosome number, structure and composition in the Penaeidae (Xiang 1988, Xiang et al
. 1991). One reason for this is due to the relatively small size and large number of chromosomes, which makes production of histological material difficult.
In this paper, we report a simple and effective technique for determining chromosome complements during spermatogenesis in two species of penaeid prawns, Penaeus merguiensis
and P. esculentus
in Australia. The first estimates of the number of chromosomes in these species are given.
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