Scientists use 3-D printing to track big fish

Feb 07, 2013
The latest fish tag design is streamlined and looks different from earlier tag designs.

CSIRO scientists are using 3D printing to build a new generation of hi-tech fish tags made of titanium. The aim is to use the tags to track big fish such as marlin, tuna, swordfish, trevally and sharks for longer periods.

CSIRO is printing the tags at its facility, Lab 22, in Melbourne. The tags are printed overnight and then shipped to Tasmania where are trialing them.

Tags are made of titanium for several reasons: the metal is strong, resists the salty corrosiveness of the , and is biocompatible (non-toxic to living tissues).

One of the advantages of 3D printing is that it enables rapid manufacture of multiple design variations which can then be tested simultaneously. "Using our Arcam 3D printing machine, we've been able to re-design and make a series of modified tags within a week," says John Barnes, who leads CSIRO's research in titanium technologies.

Evolution of the tag design can be seen in this comparison of the first tag with the latest tag.

"When our colleagues asked us to help build a better tag, we were able to send them new before their next trip to sea," he adds.

CSIRO's 3D printing facility prints metal items layer by layer out of fused metal powder. Had the scientists been using conventional tags which are machined out of metal blocks, it would have taken a couple of months to design, manufacture and receive the new designs for testing.

A line-up of fish tags, showing progression of the design from earliest (far left) to latest (far right).

"Our early trials showed that the textured surface worked well in improving retention of the tag, but we need to fine-tune the design of the tag tip to make sure that it pierces the fish skin as easily as possible," says John.

"The fast turnaround speeds up the design process – it's very easy to incorporate amendments to designs. 3D printing enables very fast testing of new product designs, which why it's so attractive to manufacturers wanting to trial new products."

Scientists from a number of agencies, including CSIRO Marine and Atmospheric Research, use fish tags to track movements of individual marine species and increase understanding of their behavior. Tracks of selected marine animals tagged by CSIRO and partner agencies can be viewed on the CSIRO Ocean Tracks website.

Medical implants such as dental implants and hip joints are made of biocompatible titanium with a surface texturing which speeds healing and tissue attachment after implantation. Scientists hope that a similar rough surface will help the tag to stay in fish longer.

This video is not supported by your browser at this time.
John Barnes talks about using 3D printing to build a new generation of hi-tech fish tags

"A streamlined tag that easily penetrates the fish's skin, but has improved longevity because it integrates with muscle and cartilage, would be of great interest to our colleagues conducting tagging programs across the world," said CSIRO marine researcher, Russell Bradford.

CSIRO's Lab 22 3D printing facility was established in October 2012 and has been used to manufacture a range of prototype products including biomedical implants, automotive, chemical processing and aerospace parts.

Explore further: A spray-on light show on four wheels: Darkside Scientific

More information: To see videos and further information on CSIRO's research on 3D printing go to www.csiro.au/TitaniumTechnologies

To see tracks of tagged fish and 3D animations of fish in their underwater environment go to www.oceantracks.csiro.au/

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