[OANNES Foro] Paralarvae of the jumbo squid, Dosidicus gigas

[Mario Cabrejos]

Invertebrate Biology
Volume 129 Issue 2, Pages 172 - 183
Published Online: 4 Mar 2010

Paralarvae of the jumbo squid, Dosidicus gigas
Jorge E. Ramos-Castillejos 1 , César A. Salinas-Zavala 1 a , Susana Camarillo-Coop 1 , and Luis M. Enríquez-Paredes 2 
  1 Northwestern Center for Biological Research, La Paz, B.C.S. 23090, Mexico 
  2 Faculty of Marine Sciences, Autonomous University of Baja California (UABC), Ensenada, B.C. 22870, Mexico 
  a Author for correspondence. E-mail: csalinas en cibnor.mx 

ABSTRACT
The rhynchoteuthion stage of the jumbo squid, Dosidicus gigas, has morphological characteristics similar to the paralarvae of the purpleback squid, Sthenoteuthis oualaniensis, making it difficult to determine the locations, seasons, and conditions where spawning of jumbo squid occurs. In this study, 180 paralarvae of D. gigas were collected off the west coast of the Baja California peninsula and identified by sequencing a 369-bp fragment of the cytochrome oxidase I gene. Of these, 77 specimens, 0.8-6.0 mm in mantle length, were described. Indices based on morphometric ratios were used to determine whether the shapes of different body structures were reliable for identifying the paralarvae. For two ratios, the results appear to discriminate members of D. gigas from those of S. oualaniensis. Additionally, eye or intestinal photophores were not observed in any paralarvae of D. gigas. Morphological and morphometric information provided a valuable basis for the discrimination and identification of these two species.
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