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Article History

Received: 6 October 2018

Accepted: 10 January 2019

First Online: 18 January 2019

Compliance with ethical standards

:

: All authors declare that they have no conflict of interest.

: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. The shark collection and experiments were performed under the “Experimental fish care PERMIT” Number 12/14048. Following the local instructions for experimental fish care (Permit 12/14048), captive animals were euthanized by a blow to the head followed by a full incision of the spinal cord at the back of the head. Animal procedures were conducted in compliance with the Belgian national guidelines and in agreement with the European directive 2010/63/UE, under the approval of the Animal Ethics Committee of the Catholic University of Louvain in Louvain-la-Neuve. This article does not contain any studies with human participants performed by any of the authors.

: All data supporting the paper are presented in the main manuscript.