Geofish

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Geofish delivers field science, data insights, and environmental monitoring across Northern Australia's waterways, supporting sustainable fisheries and community knowledge through ethical, innovative research. 🔬 Field monitoring across marine, estuarine & freshwater environments
📊 Data science, modelling & interactive visualisation
🤝 Community programs including our Saratoga Tagging Program

From tracking fish movements to mapping habitat relationships, we generate the scientific evidence needed for sustainable fisheries and informed conservation decisions.

05/08/2026

Good aquatic data begins well before analysis.

A useful field record includes careful handling, measurement, tag ID, date, location, supporting notes and a clear record of anything still needing checking.

That is how field observations become evidence that can be used responsibly over time.

04/08/2026

Recapture record: GF10331 was tagged on 27 August 2023 at 52 cm, then recaptured 25 days later, on 22 September 2023, also measuring 52 cm.

The approximate waterway route between the recorded locations is about 50 m. It is not a confirmed fish track.

One recapture does not tell us how all Saratoga move, but it adds another carefully recorded point in time to the long-term program.

Caught a tagged Saratoga? Please report it at geofish.io/tagging/

28/07/2026

On 21 August 2020, the first five Saratoga in our program records were tagged. Across those first few months, 23 new tag records were added.

That modest start became a long-term Northern Territory record, built through careful fieldwork and reports from anglers. More than 700 Saratoga had been tagged as at May 2026.

27/07/2026

Recent tagging sessions at Corroboree Billabong have added 23 new Saratoga records to the program record.

Every fish is measured, tagged and released, with the details checked before they are added to the long-term dataset. The value comes over time, when records can be compared carefully across sessions and years.

Follow along for field and data updates from Geofish.

24/07/2026

Recapture report: GF10984

Another Saratoga recapture for the program, and another useful piece of the puzzle.

GF10984 was first tagged by Shane Penny on 12 October 2025 in Corroboree Billabong, NT measuring 54 cm.

It was recaptured by Melita McKinnon on 30 May 2026, measured again at 57 cm, and safely released.

What this recapture tells us:
🐟 230 days at large
🐟 3 cm growth, or about 0.013 cm per day
🐟 About 600 m of straight-line movement between the two recorded locations

Two records do not tell us the full path the fish travelled, but each recapture adds to our understanding of Saratoga growth and movement in the systems we study.

A big thank you to Melita McKinnon for taking the time to record the fish, report the recapture and release it safely.

If you catch a tagged Saratoga, please note the tag number, location and date, take a careful length measurement, and release the fish promptly. Photo's are always welcomed.

One fish. One tag. One data point.

Address

Darwin, NT
0801

Website

http://geofish.io/

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