Abstract

During a one year study in Klisova lagoon of Mesolonghi, it was found that between West Klisova and East Klisova there exist great differences in the degree of pollution owing to eutrophication, as expressed mainly by BOD and primary productivity measurements. East Klisova showed higher values for both these parameters all year round. In West Klisova there exist also some places with bad water circulation conditions, exhibiting extreme variations in temperature-salinity, anoxic conditions and high BOD. In East Klisova salinity is much lower than West Klisova because of a constant inflow of fresh water from the insufficiently functioning sewage water treatment plant of Mesolonghi town and from irrigation water pumping stations. In the sea around Klisova lagoon, there were also occasionally measured high values for BOD, ammonia and nutrient ions indicating a rather polluted environment. Considering temperature it became possible to create regression equations between water and air temperature. This was the result of a very frequent sampling, showing high regression coefficients (> 0.8) having thus a predictive value for use in lagoonal fisheries management.

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