Dynamique de la population de sandre Stizostedion lucioperca (l.,1758 Pisces,Percidae) dans la retenue du barrage de Sidi Salem

Abstract

The study on population dynamics of pikeperch Stizostedion lucioperca living in Sidi Salem reservoir ( the north of Tunisia was realized between april 1996 and march 1998. It a was led on a sample of 1320 individuals caught by the professional fishermen of the region. This study showed that :- more than 75 % of the fishes caught had a mean total length less than 30 cm- the recruitment length estimated of 18 cm is very inferior than the first maturity length of the species which is about 24 cm- both mean length and weight of individuals had been improved during 1997 comparatively to 1996.- the mortality rate of I+, II+ and III+ age groups was high as a consequence of an intensive fishing effort.