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First observations of ‘sneaker mating’ in the California market squid, Doryteuthis opalescens, (Cephalopoda: Myopsida)

Published online by Cambridge University Press:  03 March 2009

Louis David Zeidberg
Louis David Zeidberg*
Affiliation:
Hopkins Marine Station of Stanford University, Oceanview Blvd, Pacific Grove, CA 93950, USA
*
Correspondence should be addressed to: L.D. Zeidberg, Hopkins Marine Station of Stanford University, Oceanview Blvd, Pacific Grove, CA 93950, USA email: [email protected]
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Abstract

Commercial harvest of the California market squid, Doryteuthis opalescens, formerly Loligo opalescens, has caused this species to become the largest fishery in the state in the last dozen years, in terms of both tonnage and economic value. All harvest occurs on spawning aggregations. Mating behaviour of Doryteuthis opalescens squid was observed on the egg beds in Monterey, CA during daytime, in La Jolla, CA during the night, and in the laboratory. Small males appeared to insert spermatophores into the mantles of females that were being held in a mating embrace by larger males on several occasions. These ‘sneaker mating’ interactions took 1–15 seconds. After egg deposition females jetted rapidly to disengage themselves from males, and then swam up into the water column. In Monterey, mating groups involved 10–20 individuals and had a sex ratio of one to two males for each female. No larger schools of squid were detected in the vicinity. Monterey observations occurred during a period of decreasing commercial landings and decreasing observations of egg beds on a spawning ground that had been productive since 1863.

Keywords

Doryteuthis opalescensmarket squidsneaker matingMonterey
Type
Research Article
Information
Marine Biodiversity Records , Volume 2 , January 2009 , e6
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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