SUMMARY In spite of fatal hazards likely to be encountered by fishes being carried by the 82,45 km Orange-Fish Tunnel from the Orange River to the headwaters of the Great Fish River, Eastern Cape, observations show that some are surviving this journey. Fish species passing through the Orange-Fish Tunnel are recorded and the possibility of their becoming established in the Great Fish River system and later the Sundays River system is discussed.
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Cambray et al. (1977) studied this question.