3472
The present study investigated Persistent Organic Pollutant ( POP ) concentrations , infection levels of Anguillicoloides crassus , lipid content and gonad abnormalities in eels sampled in 2007 - 2008 in three Italian water bodies ( Caprolace Lake , Lesina Lagoon and Tevere River ) that vary in salinity , trophic condition , contamination level and fishing pressure .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None