From the wiki article on Nauru:
Inhabitants practised aquaculture: they caught juvenile milkfish (known as ibija in Nauruan), acclimatised them to freshwater, and raised them in Buada Lagoon, providing a reliable food source.
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It seems any marine species found near estuaries is potentially euryhaline.
The key is to capture fry. It seems the juveniles adjust more easily. It most cases, it is best to gradually reduce the salinity though I doubt the Nauruans did that.
Bluefin Tuna and Alaska King Crab would be good candidates for experiments in euryhaline aquaculture. Angula eels (Anguilla anguilla) would also be worth studying given they are second most expensive seafood.
I'm not sure how to get juveniles of any of those species, though baby Angula are commonly caught near Spain.
Perhaps I should try my luck with clams (Mercenaria mercenaria), oysters (Crassostrea virginica), or lobsters.
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