{"refrec":{"BRefID":244276,"RR":"<b>Berg, J.</b> (1979). Discussion of methods of investigating the food of fishes, with reference to a preliminary study of the prey of <i>Gobiusculus flavescens</i> (Gobiidae). <i>Mar. Biol. (Berl.) 50(3)</i>: 263-273. <a href=\"http://dx.doi.org/10.1007/BF00394208\" target=\"_blank\">http://dx.doi.org/10.1007/BF00394208</a>","BEntID":235960,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 50(3)</i>: 263-273. <a href=\"http://dx.doi.org/10.1007/BF00394208\" target=\"_blank\">http://dx.doi.org/10.1007/BF00394208</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Berg, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Berg, J.","Englishabstract":"The validity, reliability and practicability of different methods for the investigation of stomach contents of a small, plankton-eating fish are discussed. Tests demonstrated the problems related to mass and volume measurements of planktonic food. Several nutrition indices, particularly Hynes's “frequency of occurrence” are criticized. A logarithmic version of Shorigin's index is proposed as a replacement for Ivlev's food selection index. 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