Marine Biodiversity Records

Research Article

Reproduction and life span of the oval squid Sepioteuthis lessoniana (Cephalopoda: Loliginidae): comparison between laboratory-cultured and wild-caught squid

Y. Ikedaa1 c1, Y. Uetaa2, F.E. Andersona3 and G. Matsumotoa4

a1 Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Okinawa 903-0213, Japan

a2 Fisheries Research Institute, Tokushima Agriculture, Forestry and Fisheries Technology Support Center, Tokushima 779-2304, Japan

a3 Department of Zoology, Southern Illinois University, Carbondale, IL 62901, USA

a4 Deceased

Abstract

Three consecutive generations of the oval squid, Sepioteuthis lessoniana, were cultured between October 2000 and May 2002 to investigate the life history of this species. Starting with the parental generation (wild-caught sub-adult squid from Tokushima Prefecture, Japan), we successfully obtained first and second generations. Life span and maturation of cultured oval squid and wild oval squid caught from the same habitat during April 2001 through to March 2002 were compared. Captive squid matured earlier and had a shorter life span (189–247 days) than the wild-caught squid (approximately one year) but reached an equivalent final body size. More ova were found in the oviducts of cultured females than in the oviducts of wild-caught females. Ultimately, collapse of the culture population was mainly due to the low rate of embryonic development of spawned ova, which might have resulted from the abnormal arrangement of ova in egg cases produced by later generations of females.

(Received September 05 2007)

(Accepted August 06 2008)

Keywords

  • reproduction;
  • life span;
  • oval squid;
  • comparison;
  • laboratory-cultured squid;
  • wild-caught squid

Correspondence:

c1 Correspondence should be addressed to: Y. Ikeda, Department of Chemistry, Biology and Marine Science, University of the Ryukyus, Okinawa 903-0213, Japan email: ikeda@sci.u-ryukyu.ac.jp