Abstract
The ecology of populations of roach, chub and perch in shallow lagoons forming part of a sewage works was studied over a period of two years. The fish were netted, identified, measured and scales taken for ageing, except in the case of perch of which a limited number were killed and their opercular bones collected. The chub and perch grew faster than those from other waters and the growth rate of the roach equalled that of the best European populations. Breeding success was irregular, particularly with the chub, and a relatively low population density and the high potential productivity of the lagoons could explain the rapid growth rate.
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