TAGGING ELASMOBRANCHS

Most sharks serve as top predators at the pinnacle of the marine food pyramid, and so play a critical role in ocean ecosystems. Directly or indirectly they regulate the natural balance of these ecosystems – at all levels – and so are an integral part of them. The effects of removing sharks from ocean ecosystems, although complex and rather unpredictable, are likely to be ecologically and economically damaging.

Understanding shark movements are vital in implementing effective management strategies for vulnerable species.


TYPES OF TAGS

We use two types of tags in the programme:

Floy Dart Tags: Floy tags are long spaghetti like tags ca. 12 cm in length. Due to their length, these tags are deployed on bigger species or individuals. They are inserted into the interdorsal musculature of sharks using a cannula, where the head of the tag forms an anchor, allowing for the tag to stay in place once the individual is released.

 

Floy dart tag. 

Floy T-Bar Anchor (Micro tags)The micro tags are the same style as the the floy tags, with the exception of the anchor design and size. Micro tags are ca. 7.5 in length and are adjoined in sets of 25, where each strip is held together by the T-shaped anchor. These tags are used in smaller species and individuals. The implementation of micro tags allows us to gather more data (including juveniles) which in turn allows for a better overall picture to be created.

 

 

 

 

 

 

 

Strip of micro tags in a set of 25 (left), Micro tag being deployed on a female spurdog using the tagging gun (right). 


HOW TO GET INVOLVED

If you are a sea angler (whether it be  shore, small boat, club or charter angler) and want to get involved, then you can reach us through our “Contact Us” page

 

For more information on tag types please visit the floy website

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