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首页> 外文期刊>Hydrobiologia >Population structure and feeding characteristics of Volga pikeperch,Sander volgensis (Pisces,Percidae),in Lake Balaton
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Population structure and feeding characteristics of Volga pikeperch,Sander volgensis (Pisces,Percidae),in Lake Balaton

机译：巴拉顿湖伏尔加河鲈（双鱼，Per科）的种群结构和摄食特性

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摘要

Growth,population structure,abundance,production,and feeding of Volga pikeperch were studied in Lake Balaton.The population was mainly comprised of age-groups 0+ (59%) and 1+(18%),while the total share of age-groups 6+ and older was less than 1%.Mean back-calculated standard lengths for age-groups 0+-9+were 67,123,144,196,233,256,283,316,350,and 369 mm,respectively.The instantaneous rate of growth in weight was lower at age 2+ than it was at age 3+ and 4+,suggesting unfavourable conditions for Volga pikeperch 120-160 mm in size.In autumn,the average abundance of Volga pikeperch was 34 ind.ha~(-1),the biomass 1.04 kg ha~(-1),and the production 0.76 kg ha~(-1) in the SW basin of Lake Balaton.Based on the diet,there phases can be distinguished during the ontogeny.Zooplanktivory is characteristic for the early juvenile stage up to 50 mm in size.At the size of 50-150 mm the diet becomes heterogeneous,consisting of zooplankters,benthic invertebrates,and fish.The third phase is the piscivory which becomes a determinant at over 150 mm in size.In this phase cannibalism was also significant,as 21.9% of consumed fish were conspecifics.
机译：研究了巴拉顿湖伏尔加河鲈的生长，种群结构，丰度，生产和摄食。该种群主要由0+（59％）和1+（18％）年龄组组成，而6岁及以上年龄组的平均长度小于1％.0 + -9 +岁年龄组的平均反向标准长度分别为67,123,144,196,233,256,283,316,350和369 mm.2岁以上年龄组的体重瞬时增长速度低于其年龄在3岁和4岁以上，这表明伏加长矛鱼的体型为120-160 mm。 1），巴拉顿湖西南盆地的产量为0.76 kg ha〜（-1）。根据饮食，在个体发育过程中可以区分出不同的阶段。幼龄阶段的特征是斑lan科动物。大小为50-150毫米时，饮食变得异质，由浮游动物，底栖无脊椎动物和鱼类组成。第三阶段是食肉动物在这个阶段，自相残杀也很重要，因为21.9％的食用鱼类是同种异体。

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