This time last year we were catching a lot of smolts in the Truim and Tromie traps. 2013 is a bit different with very low numbers of fish caught so far. Over the weekend both traps were frozen solid and immobile but their design means there that there is considerable rotational pressure on the cone. The water temperature had increased today to 0.3oC and both traps were turning freely. Steve and Jim have operated the traps for 5 years but this is the longest period of sustained cold weather they can recall during the smolt trapping season. It appears as if 0.3oC water temperature is the critical temperature above which the traps will remain ice free, although the air temperature will also have a bearing.
No fish in the Truim trap but there was one trout in the Tromie. We classed this as an adult rather than as a smolt. At about 225mm it was too big for a parr and although it was lean and silvery we weren’t convinced that it was a potential smolt. More likely this fish was migrating down to take up residence in the loch or river.