Some Features of the Biology of the Tench Tinca tinca (Linnaeus) in Tasmania

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Abstract
Introduced into Tasmania in the nineteenth century from the British Isles, this freshwater teleost occurs there, as in Europe, in still or slow-moving, weedy waters. Lethal temperatures are greatly influenced by seasonal differences in acclimatization; tench captured in summer have much more heat tolerance (up to 35[degree]C) than those taken in the winter (about 27CC). Tench have high respiratory tolerances which permit them to survive in environments from which other fish would be excluded. Their salinity tolerance is unremarkable, but they apparently sometimes pass a normal life in brackish water. Tench are generalized invertebrate feeders. Condition, W 102, is influenced by size and, among the larger L3 fish, time of year; thus it is highest in summer before spawning and lowest in winter, the time of minimal growth and activity.