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Marine Biology

, Volume 142, Issue 3, pp 509–516 | Cite as

Small-scale spatial and temporal patterns of egg production by the temperate loliginid squid Sepioteuthis australis

  • N. A. MoltschaniwskyjEmail author
  • G. T. Pecl
Article

Abstract

This study explored the spawning dynamics of southern calamary (Sepioteuthis australis) by estimating small-scale temporal and spatial variability in egg production in an area known to attract spawning aggregations. Surveys of the seagrass beds (Amphibolis antarctica) over 14 months determined the timing and location of egg deposition, as well as estimating total egg production and loss of deposited egg masses from the spawning grounds. Egg laying in the inshore seagrass beds occurred predominantly during the austral spring and early summer. Egg production at one location (Hazards Bay) was very similar between the two years, but at the second location (Coles Bay) egg production was threefold less during the second summer. There was considerable spatial variability in egg production among seagrass beds within a kilometre of each other as well as within 10 km. Variability in the use of seagrass beds by the squid during each summer could not be attributed to differences in seagrass density or vegetation cover. Losses of deposited egg masses in the A. antarctica beds were detected on two occasions. On the first occasion the loss was correlated with storms; however, the second and smaller loss of egg masses was not correlated with storm activity. Information about the spatial and temporal patterns of egg production was used to make recommendations about the use of fishing closures to protect spawning adults from over-fishing.

Keywords

Spawning Activity Seagrass Density Shallow Inshore Fishing Closure Loliginid Squid 
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

Acknowledgements

This project was funded by an FRDC grant (2000/121) awarded to N.A.M. Thanks to those people who provided field support: S. Willcox, M. Steer, C. Johnson, F. Murray, J. Semmens and G. Ewing. Thanks to M. Lawler for producing maps of the sites and M. Steer for biological drawings.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.School of Aquaculture, Tasmanian Aquaculture and Fisheries InstituteUniversity of TasmaniaLauncestonAustralia
  2. 2.Marine Research Laboratories, Tasmanian Aquaculture and Fisheries InstituteUniversity of TasmaniaHobartAustralia

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