{"refrec":{"BRefID":117495,"RR":"<b>Schäffer, F.; Zettler, M.L.</b> (2007). The clam sipho as indicator for growth indices in the soft-shell clam <i>Mya arenaria</i>. <i>Helgol. Mar. Res. 61(1)</i>: 9-16. <a href=\"http://dx.doi.org/10.1007/s10152-006-0049-0\" target=\"_blank\">http://dx.doi.org/10.1007/s10152-006-0049-0</a>","BEntID":111812,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Helgol. Mar. Res. 61(1)</i>: 9-16. <a href=\"https://dx.doi.org/10.1007/s10152-006-0049-0\" target=\"_blank\">https://dx.doi.org/10.1007/s10152-006-0049-0</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schäffer, F.; Zettler, M.L.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schäffer, F.; Zettler, M.L.","Englishabstract":"Due to the species' deep burrowing behaviour, growth parameters of the soft-shell clam <i>Mya arenaria</i> L. 1758 are difficult to estimate, especially in deeper habitats which are not directly accessible. In this study, we analysed 192 specimens of <i>M. arenaria</i> and found, contrary to results of most other studies that the sigmoid Gompertz growth model (GGM) is appropriate to describe the growth. Predictions from this model confirm the finding of a life span up to 8 years and as a consequence of this, a maximum shell-length of 60 mm. Individual growth rates calculated from the first deviation indicate a nearly exponential growth in young individuals. The relationship between the clam sipho-width and age, shell-length and biomass conform to the GGM. This is a new approach to assess growth of <i>M. arenaria</i> and to solve practical problems that arise in field studies. 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