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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Takeshita, Fumio Sato, Noriyosi and Herberstein, M. 2016. Adaptive Sex-Specific Cognitive Bias in Predation Behaviours of Japanese Pygmy Squid. Ethology, Vol. 122, Issue. 3, p. 236.


    Sato, Noriyosi Kasugai, Takashi and Munehara, Hiroyuki 2013. Sperm transfer or spermatangia removal: postcopulatory behaviour of picking up spermatangium by female Japanese pygmy squid. Marine Biology, Vol. 160, Issue. 3, p. 553.


    von Byern, J Söller, R and Steiner, G 2012. Phylogenetic characterisation of the genus Idiosepius (Cephalopoda; Idiosepiidae). Aquatic Biology, Vol. 17, Issue. 1, p. 19.


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  • Journal of the Marine Biological Association of the United Kingdom, Volume 88, Issue 2
  • March 2008, pp. 391-394

Estimated life span of the Japanese pygmy squid, Idiosepius paradoxus from statolith growth increments

  • Noriyosi Sato (a1), Takashi Kasugai (a2) and Hiroyuki Munehara (a3)
  • DOI: http://dx.doi.org/10.1017/S0025315408000581
  • Published online: 01 March 2008
Abstract

Growth increments in statoliths of Idiosepius paradoxus were observed for aging analysis. The rate of increment formation was examined by staining the statoliths with tetracycline at 5–14 d intervals. In 6 of 16 specimens, increments formed daily, but in the other specimens, increments formed less than one per day. The maximum number of increments observed in males and females were more than 150 and 140, respectively, suggesting a life span of ≥150 and ≥140 d. During the cool season (from November to April), the dorsal mantle length (DML) and the number of increments gradually increased. Specimens collected in June showed bi-modal patterns in DML and the number of increments. Only small specimens were collected from August to October. These results suggest that two generations alternately occurred in the cool season and in the warm season.

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Corresponding author
Correspondence should be addressed to: Noriyosi Sato Division of Biosphere Science Graduate School of Environmental ScienceHokkaido UniversityKita-ku, Sapporo Hokkaido 060–0810Japan email: norico@fish.hokudai.ac.jp
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Journal of the Marine Biological Association of the United Kingdom
  • ISSN: 0025-3154
  • EISSN: 1469-7769
  • URL: /core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom
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