Mama always said there were plenty of fish in the sea.That may be true in the dating realm, but overfishing is putting the adage out of business. For a sustainable seafood shopping experience sans guilt, wade over to I Love Blue Sea.Find sushi-grade fish (ranging from black cod to whole sardines to shellfish) that’s affordable, responsibly caught or farmed, and adheres to strict standards set forth by the Monterey Bay Aquarium and Greenpeace. Selections are made — and in certain cases, filleted — the night before they’re sent out, then delivered in ecofriendly packaging.Take founder Martin Reed’s advice for your next party: Craft the perfect shooter by mixing a shucked oyster and its juices, a splash of vodka, an acid of your choice (lime, lemon, Clamato), and a dash of hot sauce in a shot glass. It’s a combo that goes together swimmingly.Available online at ilovebluesea.com.Photo: Kenneth Muha Up to 65% off Lia MollySeema Sudan’s knitwear is inspired by bewitching locales like New Orleans, where she lives with her brood. A DailyCandy fave, her whimsical designs feel retro yet fresh — and they’re up to 65% off on Swirl.