, 1997), we suggest zebra mussels as a good biomonitor of cyanotoxins in the ecosystem. Toxic compounds bound in mussel tissues may have important implications for the good environmental status of ecosystem, socio-economic aspects and even human health. From the Curonian Lagoon it is known that zebra mussels are consumed by vimba (Vimba vimba), white bream (Blicca bjorkna), roach (Rutilus rutilus), Natural Product Library cost invasive round gobies (Neogobius melanostomus) and some other benthophagous fish and waterfowl ( Kublickas, 1959). Although, the smaller individuals

are usually preferred ( Nagelkerke et al., 1995 and Ray and Corkum, 1997). However, the analysis of microcystins distribution in the foodweb showed no evidence of biomagnification occurring NLG919 through the benthic food chain based on Dreissena ( Ibelings et al., 2005).

Another implication is related to the potential use of zebra mussels in water quality remediation and subsequent utilization of the cultured biomass. Our data suggest that utilization of D. polymorpha cultured under toxic bloom conditions may pose some risk for husbandry or add to intoxication of economically important aquatic species. Due to higher bioaccumulation capacity and incomplete depuration long time after exposure, larger mussels are of a higher concern comparing to the young ones. Therefore for remediation of coastal lagoons, we suggest considering seasonal (May–October) zebra mussel cultivation approach. This would ensure sufficiently effective extraction of nutrients by newly settled mussels avoiding the risk of severe intoxication with cyanotoxins. Anyway, proper monitoring of cyanotoxin concentration in the water during the cultivation season should be undertaken. This study was supported Phosphoglycerate kinase by the European Regional Development Fund through the Baltic Sea Region Programme project “Sustainable Uses of Baltic Marine Resources” (SUBMARINER No. 055)

and by the project “The impact of invasive mollusk D. polymorpha on water quality and ecosystem functioning” (DREISENA No. LEK-12023) funded by the Research Council of Lithuania. “
“The growing demand for oil products has increased the amount of crude oil entering to the aquatic environment caused by the accidents or regular commercial activities. Damaging effects of oil toxicity on various ecosystem elements have been increasingly reported since 1960s (Baker, 2001, McCauley, 1966 and Peterson et al., 2003). The majority of studies have focused on the oil spill effects on large organisms such as macrophytes (Kotta et al., 2009, Leiger et al., 2012 and Pezeshki et al., 2000), birds (Jenssen, 1994), fish (Carls et al., 1999) or marine mammals (Engelhardt, 1983).