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RESEARCH CONCERNING THE EXPLOITATION OF PIKE-PERCH
(STIZOSTEIDON LUCIOPERCA L.) POPULATION IN THE RAZELM LAKE


M. Staras

Danube Delta Research and Projects Institute Tulcea

Abstract
In 1961-1988, total fish yield of the Razelm Lake increased while the
pike-perch yield was steadfast up to 1986, than it decreased. The
eutrophication and intensively exploitation of pike-perch population
determine important changes of population structure. The most catched
pike-perch specimens do not reach sexual maturation. Analysing the 
dynamic of biomass and yield per recruit in accordance with the
length of first capture and fishing intensity, the necessity of mesh
size resulted.