Hi Frances,
Anglesey is one of my areas of research, but I'm not having much joy there at all - probably due to the names I'm researching though.
I'm not sure there were any canals on Anglesey - though I'm sure someone will correct me if I'm wrong. One of the main sources of income though was the sea - Anglesey being the UKs largest island.
Anyway, your best bet would be to contact Anglesey archives at Llangefni:
ARCHIFDY
archives@anglesey.gov.ukThey do charge for searching, but they will be able to tell you which newspapers you can search. They are at both Anglesey and Gwynedd archives (in Caernarfon).
There is also the Maritime Museum in Holyhead, run by a guy called John Cave, who has also mapped the cemetery at St. Seiriols - which is the main cemetery on Holyhead. There are however several other smaller ones, some of which are no longer in use.
http://www.holyhead.com/page131.htmlHowever, I have to date only had an acknowledgement from John, no information - although I know that several of my family are buried in St. Seiriols. The minister was also of no help, he only referred me back to John.
I also had a look on this site:
http://www.welshmariners.org.uk/just in case, but no luck. You could however contact Reg Davies, who may be able to point you in the right direction concerning the maritime aspects.
I'd appreciate it if you could let me know how you get on.
D