Abstract:
In this study, 43 river samples from Province Ordu in the Blacksea River Basin were examined for photosynthetic pigments content (chlorophyll-a, -b, -c and total carotenoid). The values of algal pigments were recorded between 0.051-3.86 mu g L-1, 0-4.545 mu g L-1, 0.066-11.902 mu g L-1, 0.05-3.35 mu g L-1 for chlorophyll-a, -b, -c and total carotenoid respectively. When the trophic levels of 43 flowing water according to OECD (1982) criterias are compared, they have character about 72% ultraoligotrophic, 7% oligotrophic (Akpinar, Elekci, Tabakhane and Lahna Streams), 9.3% mesotrophic (Bolaman, Tavara-Eskidir, Kavaklar, Keslek Streams).