Avon smolt trap concludes

Tomorrow morning (river levels permitting) we will remove the smolt traps from the Avon. Over the last week catches have been generally low with single figures catches until the last few days when we have caught around 20 fish each day.

With the exception of one night when the river rose and a lot of debris came downstream it has been an excellent trapping season. We are still working on the smolt production estimates but the salmon smolt output looks quite good. The number of trout/sea trout smolts caught was disappointing and with the low recapture rate it is unlikely that we will be able to provide an estimate of trout smolt production.

Yesterday we marked and released 17 fish but there were no recaptures today – highlighting the problems with marking small numbers of individuals.

There were some bonnie salmon smolts today.

A very pretty salmon smolt with prominent black edge to the tail.

A very pretty salmon smolt with prominent black edge to the tail.

Unusual wee red spots on this smolt. I suspect it was from the upper Avon although it is not possible to tell.

Unusual wee red spots on this smolt. I suspect it was from the upper Avon although it is not possible to tell.

Over the last couple weeks we have also seen a few more fish with fungus growths, including two parr today.

A moribund salmon parr with fungus infection around the vent

A moribund salmon parr with fungus infection around the vent

Some early analysis of salmon captures related to river height and river temperature are shown below.

Avon trap captures related to midnight river height (thanks to SEPA for the river levels)

Avon trap captures related to midnight river height (thanks to SEPA for the river levels)

Avon trap salmon catch related to river temperature at 9am

Avon trap salmon catch related to river temperature at 9am

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