Seasonal changes in condition, hepatosomatic index and parasitism in sterlet (Acipenser ruthenus L.)

Authors : Mirjana LENHARDT, Ivan JARIC, Predrag CAKIC, Gorcin CVIJANOVIC, Zoran GACIC

Pages : 209-214

View : 18 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Measurements of biomarker responses in fish from contaminated sites could provide valuable data for environmental risk assessment. Biomarkers are sensitive to both environmental pollution and confounding factors that are not related to pollution insert ignore into journalissuearticles values(e.g., season, nutritional status, and population density);. Unfortunately, data about the latter group are scarce. Therefore, juvenile sterlet insert ignore into journalissuearticles values(Acipenser ruthenus L.); specimens were collected on a monthly basis from the Danube River from September 2002 through August 2003 to determine if seasonal changes exist in condition, hepatosomatic index, and parasitism. Fulton condition factor insert ignore into journalissuearticles values(FCF range: 0.27 - 0.79);, hepatosomatic index insert ignore into journalissuearticles values(HSI range: 1.14 - 6.67); and Skrjabinopsolus semiarmatus parasite prevalence insert ignore into journalissuearticles values(range: 37.9 - 85.7 %);, intensity insert ignore into journalissuearticles values(range: 1 - 337 parasites per fish); and the mean intensity insert ignore into journalissuearticles values(range 9.6 - 89.2); in sterlet showed significant seasonal variations. This study pointed out that biomarker sampling on different locations has to be performed within the short time frame in order to avoid differences generated by confounding factors. Better understanding of the life cycle of S. semiarmatus and sensitivity of different phases to pollution is needed.
Keywords : Danube River, Fulton condition factor, hepatosomatic index, Skrjabinopsolus semiarmatus prevalence and intensity