http://www.omniglot.com/language/celtic ... s/fish.htm

I know we have some members who are very knowledgeable about a number of these languages; clearly I'm not one of them! Cheap mé go raibh sé suimiúil ar aon nós. Na ceangail eadarthu srl. And why were there no seals in Cornwall?

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The word they used for "salmon" in Breton has disappeared now (it has been replaced by a borrowing from French). For whale, I'm not sure "morvil" does exist in native Breton.
For Cornish, the language died and has been revived for one century or so, but if there's no mention of seals and sharks in the old texts, we can't know what are their Cornish names.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Lughaidh, this is completely off-topic, but I was reading an essay by Elmar Ternes, which said that Breton is "really" two languages. That the Vannetais dialect is really a separate language. Is that accurate?

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

No it's not accurate. The Breton dialects are like a spectrum, two parishes one beside the other speak very similar dialects, but the more distant they are one from another, the more different they are.
It's a bit like in Ireland (but in Ireland, the different Gaeltacht areas are separated by English-speaking areas, while in Western Brittany, there are still local native speakers in almost all parishes, although they may be very old sometimes). You wouldn't say Ros Goill Irish is a different language from Cork Irish, although they are very different.

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne