{"refrec":{"BRefID":206641,"RR":"<b>Jiming, Y.</b> (1982). A tentative analysis of the trophic levels of North Sea fish. <i>Mar. Ecol. Prog. Ser. 7</i>: 247-252","BEntID":198736,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 7</i>: 247-252","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jiming, Y.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jiming, Y.","Englishabstract":"Trophic levels of basic food items, feeding habits and trophic levels of various North Sea fishes have been derived from historical references and the MAFF North Sea Groundfish Survey data in 1977, 1978 and 1980. There is an obvious progression in the mean trophic levels from planktophagic (3.5) to benthophagic (3.9) and ichthyophagic (4.5). The mean trophic level of 34 species for the period 1947-77 is 3.67. 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