Parasites as biological indicators contributing to salmonid biology
1989
Urawa, S. (Yokohama Univ. (Japan). Faculty of Engineering)
The present paper reviews the use of parasites as biological indicators, which provide information on varied aspects of salmonid biology, such as mode of life, feeding habits, population dynamics, and phylogenetic development. Sixty-one species of parasites (3 Myxosporea, 1 Monogenea, 21 Trematoda, 13 Cestoda, 11 Nematoda, 7 Acanthocephala, 2 Mollusca, 3 Copepoda) have been proposed as indicators for the biological studies of salmonids. Biological tag studies on the stock identification and the homing have made good use of parasites acquired by juvenile salmonids in a restricted freshwater area and persisting throughout the life of their hosts. The migration of anadromous salmonids between marine and fresh water can be traced by the presence of the parasites that have infected the fish outside the area of capture. The coinciding evolution of parasites and their hosts yields information about the phylogenetic development and separation of the host fish. The life cycles of helminth parasites of Japanese salmonids are listed in this paper; which may be useful for estimating the hosts' feeding habits
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