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Squid sexual behaviors: Inking, jetting and copulation

2,960 views · Published 8 January 2015 · 1:01 · Indexed 30 September 2026

Channel: SciNews · 2015 · Science & Technology

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One of the important trade-offs for many animals is that between survival and reproduction. Mating increases the risk of predation, either by increasing conspicuousness, reducing mobility or inhibiting an individual's ability to detect predators, and individuals may mitigate the risk of predation by altering their reproductive behavior. 
Investigating the effect of increased predation risk on the reproductive behavior of dumpling squid (Euprymna tasmanica), researchers found that females, but not males, showed a substantial increase in the number of inks (an anti-predator behavior) before mating commenced in the presence of a predator (sand flathead Platycephalus bassensis). 
This video depicts four squid behaviors. Start of Copulation: Male is buried in the sand and grabs female. Female inks as she is grabbed. Inking: Squid in top right corner inks just before clip cuts. Jetting: Squid at top of the screen is jetting. End of Copulation: Male (the darker squid) forcefully disentangles himself from the female.

Citation: Franklin AM, Squires ZE, Stuart-Fox D (2014) Does Predation Risk Affect Mating Behavior? An Experimental Test in Dumpling Squid (Euprymna tasmanica). PLoS ONE 9(12):e115027. doi:10.1371/journal.pone.0115027
photo: Zoe Squires


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