Changes in roach (Rutilus rutilus L.) population structure induced on draining a large reservoir

被引:6
作者
Angélibert, S
Brosse, S
Dauba, F
Lek, S
机构
[1] Univ Toulouse 3, Cesac, CNRS, UMR 5576, F-31062 Toulouse, France
[2] Ensat, Equipe Environm Aquat & Aquaculture, Lab Ingn Agronm, F-31326 Castanet Tolosan, France
来源
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE III-SCIENCES DE LA VIE-LIFE SCIENCES | 1999年 / 322卷 / 04期
关键词
roach; draining; gill nets; scalimetry; growth; trophic state;
D O I
10.1016/S0764-4469(99)80069-9
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The influence of draining a large reservoir (Pareloup, South of France) on the population structure and the growth of roach is studied in this work. This reservoir, with an area of 13 km(2), drained in June 1993, was refilled 2 months later. Fish were sampled monthly before draining (1981) and after refilling (1997) by nylon monofilament gill nets used at the same catching effort for both periods. This permitted a comparison to be made between the density of roach and length distribution before and after refilling. Changes in growth were determined by scalimetry. The observed difference in population structure and growth underlined that the differences are mainly due to a greater growth rate after refilling during the first 2 years of roach life. These growth changes are explained by the decrease in roach density and the increase in 1993 of the biomass of zooplankton, which constitute the main feeding resource for 0(+) and ii roach. The study led us to propose hypotheses on the ecological significance of growth changes induced by refilling, which can be considered as a rejuvenation of the aquatic ecosystem. ((C) Academie des sciences / Elsevier, Paris.)
引用
收藏
页码:331 / 338
页数:8
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