scholarly journals Distribution of perch (Perca fluviatilis L.) during their first year of life in Lake Constance

Hydrobiologia ◽  
1994 ◽  
Vol 277 (3) ◽  
pp. 135-143 ◽  
Author(s):  
Ning Wang ◽  
Reiner Eckmann
Keyword(s):  
Perca Fluviatilis ◽  
Lake Constance ◽  
First Year ◽  
Perch Perca Fluviatilis ◽  
First Year Of Life

Population Dynamics of Percids in Lake IJssel and some Smaller Lakes in The Netherlands

1977 ◽  
Vol 34 (10) ◽  
pp. 1710-1719 ◽  
Author(s):  
J. Willemsen
Keyword(s):  
Population Dynamics ◽  
Perca Fluviatilis ◽  
First Year ◽  
Homing Behavior ◽  
Perch Perca Fluviatilis ◽  
Class Strength ◽  
High Summer Temperature ◽  
Dependent Growth ◽  
First Year Of Life ◽  
Slow Growing

Pikeperch (Stizostedion lucioperca) and Eurasian perch (Perca fluviatilis) in Lake IJssel both prey mainly upon the very abundant smelt (Osmerus eperlanus). But competition for food is of little or no importance and growth is not density-dependent. Growth rates for perch and ruffe (Gymnocephalus cernua) in some lakes are exceptionally rapid, mean lengths after 3 yr being 24 and 18 cm, respectively. Very intensive fishing for pikeperch (total annual mortality 81%) in the season before first spawning removes particularly the fast-growing fish from the population, thus restricting reproduction mainly to the slow-growing pikeperch. Year-class strength of pikeperch is strongly favored by a high summer temperature during the first year of life. Strong year-classes of pikeperch in Lake IJssel are characterized by a mean length of the young-of-the-year of 14.5 cm or more. Migration of pikeperch and perch in Lake IJssel is restricted. When transported to other areas of the lake, both species showed a distinct homing behavior. Key words: Percidae, population dynamics, Stizostedion, Perca, Gymnocephalus

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