am I right in thinking that the Girnock's figures are more in decline he Girnoch used to feature quite
My point was that without these tracking studies and knowing the migration routes it would be very difficult to go the authorities and say we THINK that the Salmon smolts are dying because of XYZ, where as if we had the data then it would be easier to argue the point.
I have just been looking at the smolt output and adult return rates for the Girnock burn and although there are or can be big variations year by year there is a downward trend in both smolts and returners. With adult female return rate at 1% and assuming the same rate for males that would mean that you need an extra 200 smolts to produce one pair of Salmon, if you increased the survival rate of the smolts (2000 conservative) that leave the burn by the same 2% that gives you 20 pairs of Salmon.
Although survival rates/returns will depend on the length of river migration, as CharlieH alluded to it would need a helluva lot of extra smolts to make any significant difference to the total run of Salmon on the Dee. But all improvements to habitat and food availability should also be done.
If tracking Salmon smolts in river or at sea can lead to an increase of just 1% or 2% survival rate that would make a huge difference.