El Ostion Mariscos operates a seafood truck on Chula Vista's Broadway corridor at 975 Broadway, serving restaurant-grade mariscos from a shaded outdoor dining area fitted with synthetic turf and a mounted screen. The truck's raw bar and cooked-seafood menu draw on the same South Bay fish supply network that stocks the shelves at Northgate González Market, turning whole fish, shrimp, and oysters into tostadas, cockteles, and ceviches throughout the week. Signature preparations include Popeye-style oysters—battered, fried, and served on the half shell—and a raw marinated crab dish that showcases the truck's focus on minimally processed shellfish. The michelada program and Chula Vista's broader mariscos-and-beer tradition align with the craft-cerveza pairings at Brewjeria Taproom & Kitchen, where Mexican-inspired brews complement seafood-forward bar snacks. The whole deep-fried mojarra is butterflied and scored in a crosshatch pattern before hitting 375°F oil, emerging with shatter-crisp skin over flaky white flesh, then plated with curtido slaw and two house salsas.