Seasonal changes in the diets and relative abundances of perch and roach in the littoral and pelagic zones of a large lake

Seasonal changes in the diets and relative abundances of perch and roach in the littoral and... In the Enonselkä and Laitialanselkä basins of Lake Vesijärvi, perch Perca fluviatilis and roach Rutilus rutilus were abundant in the littoral and in the pelagic zones throughout the summer. In the littoral zone, roach was always more numerous than perch, while perch dominated in the open water. Intraspecific diet overlap values were higher than interspecific values. In the pelagic zone, perch <155 mm fed mainly on the cladoceran Leptodora kindtii, while small bosminids were most important food items for roach. Large perch were piscivorous, feeding mainly on smelt Osmerus eperlanus. In the littoral zone small perch foraged on zooplankton and chironomid larvae and large perch on chironomids and fish (small perch). Small roach fed mainly on bosminids and detritus, while for roach <185 mm macrophytes (Elodea Canadensis, Lemna trisulca) were also of importance. Detritus was more common in the food of roach in Laitialanselkä than in Enonselkä. The slower growth rate of roach in Laitialanselkä compared with Enonselkä was probably connected with this. However, considering the latitude of the lake, the growth rate of both roach and perch was relatively fast in both basins. The results indicated that in a large lake both perch and roach are able to utilize effectively the different habitats and diverse food resources. By segregation in food resource utilization they are able to co‐exist in large quantities, at the same time maintaining a relatively fast growth rate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Seasonal changes in the diets and relative abundances of perch and roach in the littoral and pelagic zones of a large lake

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Publisher
Wiley
Copyright
Copyright © 2000 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
D.O.I.
10.1111/j.1095-8649.2000.tb02086.x
Publisher site
See Article on Publisher Site

Abstract

In the Enonselkä and Laitialanselkä basins of Lake Vesijärvi, perch Perca fluviatilis and roach Rutilus rutilus were abundant in the littoral and in the pelagic zones throughout the summer. In the littoral zone, roach was always more numerous than perch, while perch dominated in the open water. Intraspecific diet overlap values were higher than interspecific values. In the pelagic zone, perch <155 mm fed mainly on the cladoceran Leptodora kindtii, while small bosminids were most important food items for roach. Large perch were piscivorous, feeding mainly on smelt Osmerus eperlanus. In the littoral zone small perch foraged on zooplankton and chironomid larvae and large perch on chironomids and fish (small perch). Small roach fed mainly on bosminids and detritus, while for roach <185 mm macrophytes (Elodea Canadensis, Lemna trisulca) were also of importance. Detritus was more common in the food of roach in Laitialanselkä than in Enonselkä. The slower growth rate of roach in Laitialanselkä compared with Enonselkä was probably connected with this. However, considering the latitude of the lake, the growth rate of both roach and perch was relatively fast in both basins. The results indicated that in a large lake both perch and roach are able to utilize effectively the different habitats and diverse food resources. By segregation in food resource utilization they are able to co‐exist in large quantities, at the same time maintaining a relatively fast growth rate.

Journal

Journal of Fish BiologyWiley

Published: Jan 1, 2000

References

  • Diel pattern of pelagic distribution and feeding in planktivorous fish
    Bohl, Bohl
  • Diurnal changes in the vertical distribution of cladocerans in a biomanipulated lake
    Horppila, Horppila
  • The fate of a roach Rutilus rutilus stock under an extremely strong fishing pressure and its predicted development after the cessation of mass removal
    Horppila, Horppila; Peltonen, Peltonen
  • The effects of food‐web management on fish assemblage dynamics in a north‐temperate lake
    Peltonen, Peltonen; Ruuhijärvi, Ruuhijärvi; Malinen, Malinen; Horppila, Horppila; Keto, Keto
  • Effects of habitat and season on competitive interactions between roach ( Rutilus rutilus ) and perch ( Perca fluviatilis )
    Persson, Persson
  • The influence of simulated aquatic macrophytes on the zooplankton consumption rate of juvenile roach, Rutilus rutilus , rudd, Scardinius erythrophthalmus , and perch, Perca fluviatilis
    Winfield, Winfield

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