Some Aspects of the Ecology of Lake Macquarie, N.S.W., with Regard to an Alleged Depletion of Fish. X. The Movements of Fish.

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Abstract
Of 20,128 fish of 29 species tagged, 9.4 per cent. were recovered by commercial fishermen and anglers. A further 1.5 per cent. were retaken by the tagging crew. Only 11 species were tagged in numbers greater than 100. Returns covered 17 species, showing recovery rates varying from 1 to 21 per cent. Some exchange of fish takes place between the northern and southern parts of the lake, but this is consistent only in the case of the flat-tail mullet. Within the two parts of the lake lateral movements of some species take place; other species are sedentary. These facts suggest that the necessary condition for population estimation, that tagged fish should be randomly distributed amongst the population, is not achieved for most species.

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