SEA-FISHERIES LABORATORY. 145 
APPENDIX I. 
(From Quarterly Report of November, 1915) 
Dr. JoHNsTONE’S REPORT ON THE CARDIGAN Bay MUSSEL 
ORDER. 
As it seemed likely that this Order would come into 
force during last quarter, a good deal of time was spent 
in making preliminary investigations in order that 
suitable methods of treating the local mussels might be 
devised. In addition to visits of inspection and analyses 
previously made and reported upon, I spent about a week 
at both Aberdovey and Barmouth during June, and had 
the ready and careful assistance of Captain EH. Lewis, 
the local Fishery Officer, on these occasions. Subsequent 
collection of samples was made by Captain Lewis, and 
I am very much indebted for this help, which made 
further visits to Cardigan Bay unnecessary. 
All three estuaries, at Aberdovey, Barmouth, and 
Portmadoc, presented great difficulties. The mussel 
industry is a very small one, involving perhaps some two 
dozen fishermen regularly during the season. The 
expense of providing means of purifying the shellfish 
had to be proportionate to the value of the industry. At 
all the places, however, a considerable degree of develop- 
ment may be regarded as probable. There is much scope 
for transplantation and fattening of small seed mussels 
otherwise valueless, and this transplantation depends for 
its success upon the provision of means for purification. 
It is desirable that the small seed mussels should be 
transplanted into those parts of each estuary where 
growth will proceed most rapidly; that is, into the places 
where there is most sewage. The mussels must then be 
so treated as to remove the contamination—that is, the 
sewage bacteria—taken in during the last day or two of 
the growth period. 
Ambitious and expensive works, such as those now 
