A note on the growth‐rate and year‐class strength of bream, Abramis brama (L.), in three eutrophic lakes, England

Abstract

In this study some comparative observations on the growth‐rate and year‐class strength of bream, Abramis brama, in three Shropshire‐Cheshire meres are given. All populations are exposed to variable recruitment. The occurrence of four strong year‐classes (1959, 1966, 1969,1973) suggests that climate is an important factor influencing spawning success. Water temperatures ≥16°C in July and August may be particularly important. All other intervening year‐classes are absent. The growth‐rate of bream in Tatton Mere and Ellesmere Mere is good (L∞= 541–561 mm) but comparatively poor (L∞= 448 mm) in Cole Mere. The significance of population density, food supply and parasitic infestation by Ligula intestinalis is discussed.