Hog Island Oyster Company

About Hog Island Oyster Company

Reviewed by Oyster Tasting Guide editorial team · June 2, 2026

Founded

July 1983, in Tomales Bay, California

Founders

John Finger and Michael Watchorn, both marine biologists

Location

Marshall Farm on Tomales Bay, CA; hatchery and nursery in Humboldt Bay, CA

Species

Pacific (Crassostrea gigas), Kumamoto, Atlantic, and European flat oysters

Cultivation

Rack-and-bag system adapted from French aquaculture

Scale

Roughly 160 saltwater acres in Tomales Bay; sells over 5 million oysters a year

Started with

A 5-acre lease and a handful of spat

Hog Island Oyster Co. began in July 1983, when two marine biologists, John Finger and Michael Watchorn, planted their first oyster seed in Tomales Bay, California. Their early motto was "strong backs and weak minds," and their starting capital amounted to a five-acre shellfish lease, a handful of spat, and a lot of ambition. Marine scientists by training, they set out to prove that great oysters could be grown sustainably on the Northern California coast, and over four decades they built one of the most recognizable names in American shellfish.

Today the company occupies roughly 160 saltwater acres in Tomales Bay, where its Marshall Farm serves as the company's home base. Hog Island starts its shellfish seed from scratch at its own hatchery and nursery in Humboldt Bay, a few hundred miles up the coast, where it also grows Pacific and Kumamoto oysters before they finish in Tomales. This vertically integrated approach, from hatchery seed to harvest, gives the company tight control over quality and lets it raise several species and brands, including its flagship Sweetwater, alongside Kumamotos, Atlantics, and French-style varieties.

The farm's signature growing method in Tomales Bay is a "rack-and-bag" system adapted from French aquaculture, in which oysters are planted by the hundreds into mesh bags suspended on long cables and racks above the bay floor. NOAA Fisheries has profiled the operation as a model of low-impact aquaculture: the oysters require no feed, fertilizer, or added fresh water, and they actively filter and clean the surrounding water as they grow. Founder John Finger has framed the work as producing food that is low on the food chain while improving the health of the bay itself, an argument that has made Hog Island a frequent reference point in conversations about sustainable protein.

What makes a Hog Island oyster taste the way it does is, in Finger's words, "one of the purest tastes of place." The cold, clean, nutrient-rich waters of Tomales Bay, flushed by Pacific tides, give the oysters their characteristic balance, and tasters of the Sweetwater in particular tend to describe a buttery, sweet, not-too-briny profile. The company grows distinct lines tuned to different waters and methods, so a Hog Island Atlantic, a Kumamoto, and a Sweetwater each express the merroir and handling behind them.

Beyond the farm, Hog Island has become a Bay Area institution. It runs oyster bars and restaurants, sells over five million oysters a year to wholesale and retail customers, and welcomes visitors to its Tomales Bay farm for guided tours, tastings, and shuck-your-own experiences on the water. After more than 40 years, the brand has come to stand for the idea that an oyster can be both a celebrated delicacy and a genuinely sustainable crop.