How We Do Things at IISD–ELA. Fish Surgery: Implanting an acoustic telemetry tag
How We Do Things at IISD-ELA is a series of videos that highlight research conducted by scientists at the IISD Experimental Lakes Area (IISD-ELA), a unique freshwater science research facility in northwest Ontario, Canada.
Have you ever wondered what a fish does during the day? How about at night? Since fish live under the water, it is difficult to know what they do and where they go without going under the water yourself. Fortunately, IISD–ELA scientists have a remote method of figuring out where fish spend their time: acoustic telemetry. They implant large-bodied fish such as lake trout and northern pike with specialized tags that send out signals called “pings” every few minutes. An array of data loggers suspended in the lake records these pings, and then sends the information by radio signal to a computer on the shore of the lake. The computer uses this information to figure out exactly where the fish is in the lake 24 hours a day. This is a great method of observing fish in their natural habitat, and one that has been used at the Experimental Lakes Area for more than 10 years.
Scientists implant these tags into the gut cavity of the fish by performing a quick surgery while the fish is under anesthesia. This video shows IISD–ELA biologist Lee Hrenchuk conducting surgery on a lake trout from Lake 373, one of IISD–ELA’s Long Term Ecological Monitoring (LTER) lakes. The fish was captured by angling and immediately brought to shore for surgery. After the surgery and a brief period of recovery, the fish was released back into the lake and will be tracked for the next three and a half years (the approximate tag life). Fish with implanted tags have a great survival record and are consistently recaptured in good health many years after the tags have run out of battery power. IISD–ELA scientists are currently tracking lake trout in three lakes at ELA as part of the Water Diversion study, LTER program and Freshwater Aquaculture study.
You might also be interested in
COP 29 Outcome Moves Needle on Finance
In the last hours of negotiations, concerted pressure from the most vulnerable developing countries resulted in an improved outcome on the finance target, with a decision to set a goal of at least USD 300 billion per year by 2035 for developing countries to advance their climate action.
The Hidden Clauses That Can Hinder Tax and Investment Policy Reform
Stabilization clauses should no longer automatically be included in contracts between states and investors. If they are, they should, at a minimum, build on the latest international standards on stabilization to avoid being a barrier to sustainable development.
Coalition against fossil fuel subsidies expands but misses initial targets
The UK, Colombia, and New Zealand have signed on to a coalition of governments aiming to phase out fossil fuel subsidies, joining 13 other mainly European nations in the alliance. IISD's Vance Culbert said that half a dozen more countries—including "a few larger economy developing countries"—are talking privately to them about joining too.
Europe’s Dash for Gas in Africa puts Private Profits First
Europe’s demand for gas is contributing to expansion of LNG projects in Mozambique, Nigeria, and Senegal. This favours the interests of European oil and gas companies over those of African countries, a new report shows.