The occasion is the search. «Christmas dinner», «birthday for twelve», «anniversary meal» bring people who are not looking for fish but for an evening that has to work.
The price per kilo generates its own stream of searches. Somebody typing «how much is a seafood platter» wants to do the arithmetic before booking, and answering that fills tables.
The species is a keyword. Anybody typing «carabineros» or «goose barnacles» already knows what they want, and those searches are small, expensive and almost unclaimed.
Takeaway is December turnover and a year-round search. «Seafood platter to order» has a season, but serving it twelve months a year sells in August too.
Provenance gets searched now that everybody has learnt to ask. Port, market and delivery day make text that builds trust and that no competitor can copy.
The booking is the real landing page. Twelve people on a Saturday are not looking for a restaurant but for a yes, and stating the capacity saves both sides three phone calls.