Ängesån, historical

Ängesån was the site of a fish counting project focused on migrating wild salmon and sea trout in the lower part of the river. The project started on 28 May 2015 and was run by Kalix älv ekonomisk förening. Counting was paused in 2016 because of a lack of support from sponsors or other stakeholders, then resumed for a new season on 7 June 2017. For anglers, these records are useful as historical migration context, not current live data.

These charts show archived migration records from the available Ängesån counting seasons. They can help compare the two available seasons, show when fish movement was recorded, and give a limited view of how migration developed in the lower river.

Treat the charts as historical data from a short monitoring period, not as a current picture of the river. With only 2015 and 2017 available, the data is useful for context, but it should not be used to define a long-term average. It is better read as a snapshot of recorded migration during the years for which counting data is available.

If you show annual, monthly or cumulative charts, make the limited data range clear. A chart based on two seasons can still be useful, but it cannot show whether Ängesån is improving, declining or following a stable long-term pattern.

According to the archived source, the counting project was located in the lower part of Ängesån, a river that joins Kalixälven at Överkalix. This mattered because it monitored fish entering Ängesån from the Kalixälven system, rather than fish already spread across the whole tributary.

The counter did not describe every pool or fishing area in Ängesån. It gave a signal from one monitoring point in the lower river. For anglers, that distinction matters because fish recorded there may still have needed time to move into upstream stretches.

The archived source describes the system as a camera based on a Simsonar echo sounder. It recorded sonar signals to a computer, and the recording could later be analysed in a way similar to video footage. The system registered upstream and downstream movement, time of passage, fish size and movement pattern.

1. Fish passed through the monitored area.
2. The Simsonar system recorded sonar signals.
3. The recording was saved for later analysis.
4. Movement direction, timing, size and movement pattern were checked.
5. Species identification was based on fish size and timing within the season.

This means the records should be treated as analysed historical data, not as a simple live counter feed. The archived source describes the method as the same as in Råneälven and similar to the technology used in Torneälven.