Age and growth of the ark shell scapharca broughtonii (Bivalvia, Arcidae) in Japanese Waters

Daisuke Sugiura, Satoshi Katayama, Shuji Sasa, Koichi Sasaki

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16 Citations (Scopus)


Age and growth of the ark shell Scapharca broughtonii in 3 bays in Japan (Mutsu, where ark shells are cultured, and Nanao and Sendai, where they occur naturally) were examined using a shell sectioning and staining method. When a water-based marking pen was used to stain the opaque zones only in shell cross-sections, unstained translucent zones (i.e., growth rings) were clearly observed. Based on seasonal changes in marginal structures of shell cross-sections and marginal growth indices (MGIs), growth rings were estimated to be formed annually in summer when shell growth ceased. The estimated maximum ages for ark shells from Nanao and Sendai bays were 6 y and 20 y, respectively, whereas for Mutsu Bay the maximum age was not calculated because we had only young, cultured specimens, von Bertalanffy growth models were estimated as Lt = 80.1(1-e -0.365(t+ 0-160) for Mutsu Bay, Lt = 115.3(1-e -0.478t-0162) for Nanao Bay, and Lt = 84.8(1-e -0.473(t + 0.222) for Sendai Bay. There was no significant difference between von Bertalanffy growth models fitted for the northern and southern areas of Sendai Bay. Comparing among the 3 bays, faster shell growth may occur in the locality where water temperature is warmer.

Original languageEnglish
Pages (from-to)315-324
Number of pages10
JournalJournal of Shellfish Research
Issue number1
Publication statusPublished - 2014 Apr


  • Scapharca broughtonii
  • age
  • ark shell
  • growth
  • shell sectioning and staining
  • variation
  • water-based marking pen


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