Larval development of a Japanese crayfish, Cambaroides japonicus (De Haan)
The larval development of a native Japanese crayfish, Cambaroides japonicus, from northeastern Hokkaido, was studied and described. Development requires three larval stages, and one juvenile stage, before the first free living form occurs. In comparison to Pacifastacus leniusculus trowbridgii, which has an overlapping distribution, C. japonicus requires one more larval stage, and one more week, to become free-living. It also has smaller first pereiopods during the larval stages, which are a handicap for protection from competitive species. Although three species and one subspecies of crayfish are distributed in Japan, and the distribution and ecology of these species have been much studied by Japanese scientists, their life history and morphological development have been little known up to the present. Some larval characteristics provide competitive advantages over other crayfish species. However, fewer eggs, more larval stages, slower growth, smaller pereiopods, and poor disease resistance all contribute to the displacement of indigenous C. japonicus populations by introduced competitors such as P. leniusculus trowbridgii.
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Document Type: Research Article
Publication date: 1997-07-01
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