The　investigation　of　biomagnification　of　polycyclic　aromatic　hydrocarbons　(PAHs)　and　endosulfan,　an　organochlorine　pesticide　(OCP)　and　a　new　persistent　organic　pollutant,　has　been　limited　in　freshwater　food　chains.　The　objective　of　the　present　study　was　to　investigate　the　levels　with　focus　on　the　sources　and　biomagnification　of　PAHs　and　OCPs　in　fish　from　Taihu　Lake,　China.　In　193　samples　of　24　species　investigated,　the　concentrations　ranged　from　289　to　9　500　ng/g　lipid　weight　(lw)　for　PAHs,　and　from　121　to　904　ng/g　lw　for　OCPs,　indicating　that　the　fish　in　the　lake　was　moderately　contaminated.　The　PAHs　mainly　originated　from　both　unburned　petroleum　and　combustion　of　fossil　fuels,　and　the　OCPs　from　aged　residues.　It　was　unlikely　that　most　of　the　PAHs　and　OCPs　were　biodiluted　through　the　food　chain　because　their　trophic　magnification　factors　were　higher　than　one　nevertheless　the　P-values　＞　0.05.　Aldrin,　dieldrin,　p,p＇-DDE,　p,p＇-DDD,　and　endosulfan　sulfate　were　significantly　biomagnified　through　the　food　chain.　(C)　2012　Elsevier　Inc.　All　rights　reserved.