Observations on the biology and ecology of rainbow trout, Oncorhynchus mykiss, and its implications for fisheries in the highlands of Papua New Guinea
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This report provides preliminary information on the biology and ecology of rainbow trout, Oncorhynchus mykiss, in highland streams of Papua New Guinea. The extent of success of its introduction and its implication on any future introductions of other coldwater fish species are discussed. The relevance of trout to the Sepik River Fish Stock Enhancement Project (SRFSEP) is based on the fact that salmonid trouts were the first exotic fishes to be introduced to Papua New Guinea for the purpose of enhancing fish stocks (West & Glucksman 1976). Furthermore, a follow-on project based on recommendations given by SRFSEP and dealing with stocking higher altitude rivers in order to improve fisheries in highland areas commenced in March 1993 (FISHAID; see Coates 1992). The presence of rainbow trout (presumably the only salmonid species established) may have considerable implications for future stocking of other coldwater fish species recommended by SRFSEP and undertaken during the FISHAID projec t.