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- W1984101378 abstract "Checks were formed on the scales in June and July. A dominant 1959 year class accounted for half the population present in 1964. Females grew faster than males and attained greater ultimate size. Growth in the River Lugg was good in comparison with rates in other British waters. The sex ratio was found to change with age; a predominance of males in the youngest age classes changed to a preponderance of females in the older classes. The youngest fishes caught (3+) were already sexually mature. The gonads were found to be a constant proportion of the body weight for fishes of all sizes at a given season. Spawning was completed by June; males were ripe in May. The ovaries recovered more rapidly than the testes after spawning. Seasonal variation in feeding activity, with higher activity in summer, was observed and could be correlated with temperature. Seasonal changes in the diet could be related to availability. The diet was predominantly vegetable; the most important animal component, aquatic insect larvae, accounted for 11 % of the total diet. Aerial insects were rarely eaten. Diet varied with age: molluscs being particularly important to older roach; younger roach consumed large amounts of substrate material. There is some evidence that young roach indiscriminately ingest substrate material but older roach are more selective and reject inert material." @default.
- W1984101378 created "2016-06-24" @default.
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- W1984101378 date "1972-10-01" @default.
- W1984101378 modified "2023-10-16" @default.
- W1984101378 title "The growth, reproduction and food of the roach Rutilus rutilus (L.), of the River Lugg, Herefordshire" @default.
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- W1984101378 doi "https://doi.org/10.1111/j.1095-8649.1972.tb05696.x" @default.
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