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Marine litter (ML) is a complex though solvable problem with significant implications for the marine and coastal environment and human activities all around the world. It originates from several sources, travels in many paths and finally sinks in different distances from its origin making its wide spectrum of negative environmental, economic, safety, health and cultural impacts highly considerable. Despite efforts made internationally, regionally and nationally, there are indications that the marine litter problem continues to worsen.

The Ministry of Environment and Natural Resources of Azerbaijan and Caspian Environment Programme by supporting of UNDP agreed with NGO "Ruzgyar" to organize of 1st professional level monitoring of POPs in Kura-Araks basin till Caspian Sea. "Ruzgyar" contracted professional environmental research company "Azecolab" to implement of standard sampling and lab analytical processes.

Toxicity tests are commonly used as a tool to determine the standards of water quality for chemicals and to discover appropriate organisms as bioindicators in toxicological studies, and also could be used as an essential tool for evaluation of the pollutant effects in aquatic ecosystems. The aim of the present study was to evaluate the sensitivity of two Caspian fish species, Caspian trout as an endangered species and Caspian Kutum using the static acute toxicity in response to nonylphenol, which is widely discharged into the Caspian Sea environment.

In addition, Caspian trout was approximately 6 times more sensitive than Caspian Kutum. Nonylphenol was reflected to be "highly toxic" to Caspian trout and "moderately toxic" to Caspian Kutum. The results could be considered in preparing plans for conservation and restocking management of Caspian Kutum and the endangered Caspian trout.