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Marine Biology

, Volume 162, Issue 8, pp 1685–1693 | Cite as

Determination of squid age using upper beak rostrum sections: technique improvement and comparison with the statolith

  • Bi Lin Liu
  • Xin Jun ChenEmail author
  • Yong Chen
  • Guan Yu Hu
Method

Abstract

Analysis of growth increments in beak rostrum sagittal sections (RSSs) has been increasingly used for estimating octopus age. In this study, we develop an effective method to process and read the RSS of four oceanic ommastrephid squid species (Dosidicus gigas, Ommastrephes bartramii, Illex argentinus and Sthenoteuthis oualaniensis) and validate the daily deposition of the increments by comparing to corresponding statolith-determined ages. The proposed method of processing yielded readable rates ranging from 42.9 % in I. argentinus to 71.7 % in D. gigas for samples from I. argentinus to D. gigas. The high precision of the increment readings with low independent counting coefficient of variation indicates that the processing and counting methods used are reliable. This study suggests that the RSS of the upper beak is an appropriate tool for estimating the age of D. gigas, O. bartramii and perhaps S. oualaniensis, although erosion of the rostral region may result in an underestimation of squid ages.

Keywords

Section Plane Growth Increment Increment Width Squid Species Daily Deposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was funded by National Nature Science Foundation of China (NSFC 41306127 and NSFC41276156), National Nature Science Foundation of Shanghai (No. 13ZR1419700), the Innovation Program of Shanghai Municipal Education Commission (No. 13YZ091), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20133104120001) and Shanghai Universities First-class Disciplines Project (Fisheries). Y. Chen’s involvement was supported by Shanghai 1000 Talent Plan Program and SHOU International Center for Marine Sciences.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Bi Lin Liu
    • 1
    • 2
    • 3
    • 4
    • 5
  • Xin Jun Chen
    • 1
    • 2
    • 3
    • 5
    Email author
  • Yong Chen
    • 1
    • 3
    • 4
  • Guan Yu Hu
    • 1
    • 3
  1. 1.College of Marine SciencesShanghai Ocean UniversityLingang New CityChina
  2. 2.The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries ResourcesMinistry of EducationLingang New CityChina
  3. 3.Collaborative Innovation Center for Distant-Water FisheriesLingang New CityChina
  4. 4.School of Marine SciencesUniversity of MaineOronoUSA
  5. 5.National Engineering Research Center for Oceanic FisheriesLingang New CityChina

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