首页 | 本学科首页   官方微博 | 高级检索  
     


The age, growth and diet of a freshwater population of the flounder, Platichthys flesus (L.), in southern England
Authors:W. R. C. Beaumont   R. H. K. Mann
Affiliation:Freshwater Biological Association, River Laboratory, East Stoke, Wareham, Dorset BH20 6BB, U.K.
Abstract:Otoliths from 640 flounders from the River Frome, a chalk river in southern England, were used for age and growth studies together with length-frequency data. Mean lengths at ages I–V were 89, 151, 225, 304 and 323 mm respectively; these are higher than have been reported for marine populations. All flounders caught were immature and, on reaching the sea, both sexes probably became sexually mature a year older than did the marine populations. Flounder diets in freshwater comprised largely aquatic insects, Mollusca and Crustacea but there were differences between large and small fish; seasonal changes in diet largely reflected prey availability. It is suggested that competition for food and space in estuaries between 0 group flounders have given rise to the migration into fresh water.
Keywords:
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号