BTT Tarpon Acoustic Tagging Project
from The Fishing Wire
BTT is pleased to announce that our new tarpon acoustic tagging project is beginning shortly. The purpose of this study is to obtain scientific data necessary for tarpon conservation that will be used exclusively to protect tarpon and enhance their habitat through improvements in fishery management. BTT will not distribute specific data to the public and will only describe tarpon movements and habitats in a general way in order to build public support for greater protections. This project will help answer the following questions:
Is the tarpon population large and robust or small and vulnerable? If anglers in a particular location are fishing for the same fish every year, then the tarpon population is probably smaller than we think, and issues like shark predation will become a bigger concern. If fish move among regions every year, and anglers are fishing for different fish each year, the tarpon population is probably large.
Do tarpon use the same spawning site each year or move among spawning sites? On average, ocean currents will carry the larvae from a spawning site to juvenile habitats in a specific geographic region. If it’s the same adults at the spawning site every year, then local adult losses will cause declines in juveniles. If tarpon move among spawning sites, then the population will be more resilient.
How do changes in freshwater flows into coastal waters influence tarpon movements? Do the problems with Lake Okeechobee and Everglades restoration impact tarpon? Are the water issues in Apalachicola causing changes in tarpon movements?
What are the movement patterns and habitat use of mid-size tarpon (20-50 pounds)? How will these tarpon be impacted by coastal water quality issues? This size class, which is the future of the fishery, is very vulnerable to changes in coastal habitats and water quality.
Why Acoustic Tracking?
Although satellite tagging previously funded by BTT provided valuable data, the tags typically only stayed on the tarpon for a few months at a time, which prevented long-term tracking. In addition, because of the large size of the satellite tags, their use is limited to tarpon over 80 pounds.
The new Tarpon Program will use acoustic telemetry to track tarpon movements.
acoustic tags come in many sizes
Advantages of acoustic tags are that they are smaller and less invasive and can remain with the fish and active for up to five years rather than a few months. In addition, because acoustic tags come in a range of sizes, they can be used on tarpon from 20 pounds and larger, not just the extra-large adults. They also cost significantly less than satellite tags.
How Acoustic Tagging Works
Tags are surgically implanted in the abdomen. Each tag emits an ultrasonic ping that has a unique code for each tag. These pings are detected by underwater receivers when a tagged fish swims in range. When receivers are placed at strategic locations like inlets, bridges, and schooling locations, they can be very efficient.
As part of this four-year study, BTT will place 20 new receivers in waters around Florida, to add to the 60 receivers we already have in the water. In addition, colleagues at universities and state and federal agencies are using this technology to study movements of other fish species. Their receivers will also detect BTT tarpon tags. With more than 1,300 receivers in the water in the Gulf of Mexico, and more than 3,000 along the southeastern US coast, this project will be able to examine both local and long-distance movements for many years. BTT will tag 50 fish in each year of the study.
How You Can Help
Sponsor a Tarpon: Sponsor an acoustic tag for $2,500. You can name your tarpon, and will receive a certificate with its name, photo and initial capture info (very general location and measurements). Each time BTT downloads data from the receivers (approximately every 6 months), a summary of the general data on your fish will be sent to you.
Sponsor a Receiver: Sponsor and name an acoustic receiver (listening station) for $3,000. Each time BTT downloads data from your listening station, you will receive a summary of the fish that have been detected by that station.
Help us tag tarpon. Prior to a tagging trip, our scientists will put out a notice about when and where they will be, along with contact information. If you are fishing in that area when we are tagging, all you need to do is call us when you catch a tarpon. We’ll come to your boat, transfer the tarpon over, and take care of the rest. Remember to always keep the tarpon in the water!
Contact Us Today!
For more information and to sponsor a tag or receiver, please contact Alex Woodsum, Director of Development and Communications at 617-872-4807 or [email protected]
The purpose of this study is to obtain data necessary for conservation. Data from this study will only be shared with the public in a very general sense to explain how the data is contributing to conservation. Specific data on tarpon movements, habitat use, etc. will not be shared. Our goal is to use these data for conservation, not to help anglers catch more tarpon. So rest assured, the data is highly confidential.