Environmental Biology of Fishes

, Volume 18, Issue 3, pp 219–227

Reproductive biology of stream-spawning roach, Rutilus rutilus

  • Leif Asbjørn Vøllestad
  • Jan Henning L'Abée-Lund
Full paper

DOI: 10.1007/BF00000361

Cite this article as:
Vøllestad, L.A. & L'Abée-Lund, J.H. Environ Biol Fish (1987) 18: 219. doi:10.1007/BF00000361

Synopsis

The reproductive biology of roach, Rutilus rutilus, was investigated during 1980–1982 in a small tributary of the eutrophic Lake rungen, southeastern Norway. The upstream migration started in early May with medium or falling water levels and water temperatures of 6–10° C, and lasted until late May or early June. Roach (both males and females) migrating early in the season were larger than roach migrating late in the season. Males matured on average one year younger than females. The first males were mature at age 2 years, the first females were mature at age 3 years. Males were smaller than females in all age groups. There was no significant year to year variation in mean length of male and female roach in the various age-groups. Mean population fecundity during 1980–1982 was estimated to be 19 × 106 eggs or 63300 eggs m−2 of spawning area. The survival rate of eggs and small roach varied considerably due to rapid and unpredictable changes in water and silt levels. Mean annual survival rates for mature male and female roach were 0.30 and 0.52, respectively. The survival rates did not vary with age.

Keywords

MigrationSurvivalFecundityFishCyprinidaeNorway

Copyright information

© Dr W. Junk Publishers 1987

Authors and Affiliations

  • Leif Asbjørn Vøllestad
    • 1
  • Jan Henning L'Abée-Lund
    • 1
  1. 1.Department of Biology, Division of ZoologyUniversity of OsloOsloNorway
  2. 2.Østfold County Environmental AdministrationMossNorway
  3. 3.Directorate for Nature ManagementFish Research DivisionTrondheimNorway