63 
It has been shown that for Channel herrings the waters of the 
Channel were favourable for the hatching and development of 
young herrings in 1904. A paper by Gough on the distribution 
and migrations of Muggiaea atlantica* is of interest. Muggiaea 
appeared at the entrance of the English Channel early in 1904, 
and evidently came from the Bay of Biscay. During the year 
it gradually spread up the Channel, and also drifted northward, 
crossing the Bristol Channel in July. In August and early 
September it was found in the Irish Sea, and had extended west- 
ward along the south coast of Ireland. By the end of September 
it had reached Valentia, and in November it was found in the 
southern part of Galway Bay. The dates and localities of the 
finding of Muggiaea suggest a current during 1904 moving from the 
Bay of Biscay towards the south-west of Ireland, and turning 
along the west coast. If this current continued during 1905 
it would arrive off the north-west coast in time to have an effect 
on the 1906 year-class as it had on the 1905 year-class of the 
Channel. 
Whilst there may have been some connexion between the 
distribution of Muggiaea and the 1906 year-class, a more probable 
explanation of its abundance appears to be in some much greater 
movement of Atlantic waters. In 1905 water of over 37 per mille 
salinity advanced to the north-east, threw off an area of high 
salinity, which in August reached the south-west of Ireland, and 
probably accounted for the high salinities found off the north- 
west of Scotland and in the North Sea.in October and November.+ 
Locu Fyne.—Loch Fyne is another area which showed no 
improvement of the fishery arising from a rich 1904 year-class. 
For some years previous to the time when this year-class should 
have made its appearance the fishery had yielded very small 
catches. The statistics available are of interest, and are here 
given. They are from the Annual Report of the Fishery Board 
for Scotland, 1920, page 55. 

* Pub. de Circ., No. 29. 
+ Matthews. The Surface Waters of the North Atlantic Occan south of 60° N, latitude, 
Sept., 1904, to Dec., 1905, page 286, North Sea Fish. Invest. Committee, 2nd Report, pt. 1. 
