If you are stranded near a coastline, you are in one of the better survival scenarios for food. Coastal environments are rich with calories between the intertidal zone, beach, and inland vegetation. The problem is knowing what is safe and how to harvest it.
Edible Seaweed
Seaweed is abundant and underrated as survival food. Packed with minerals, vitamins, and carbohydrates. No species is acutely toxic to humans, though some taste terrible.
- Sea lettuce (Ulva lactuca): Bright green thin sheets on intertidal rocks. Eat raw or dried. Mild and slightly salty.
- Dulse (Palmaria palmata): Reddish-purple in the North Atlantic. Chewy with smoky dried flavor. High protein.
- Kelp (Laminaria): Large brown seaweed on beaches. Eat fronds raw or cooked. Rich in iodine so moderate quantities.
- Nori (Pyropia): Dark sheets on upper intertidal rocks. Same species used for sushi wraps.
Harvest seaweed still attached to rocks and recently exposed by tide. Avoid decomposing beach seaweed.
Shellfish and Intertidal Animals
When the tide goes out, it leaves protein-rich animals on rocks, in sand, and in tide pools. Mussels grow in clusters on rocks and pilings; cook until they open, discard any that stay closed. Limpets are conical shells on rocks; knock off with a sideways strike. Tough but edible cooked. Periwinkles are small snails on rocks; boil and extract with a thorn. Small, so you need many. Clams hide under small sand holes at low tide; dig a few inches. Crabs hide under rocks in tide pools; catch by hand, watching claws. Cook by boiling or roasting on coals.
Shellfish Safety Warning
Red tide and harmful algal blooms can make shellfish toxic. Paralytic shellfish poisoning can be fatal.
- Avoid filter-feeding shellfish during warm months (May through October, Northern Hemisphere).
- Reddish or brownish water means avoid mussels, clams, and oysters.
- Crabs and shrimp are generally safer since they do not filter-feed.
- Cooking does not destroy shellfish toxins.
Coastal Plants
Sea beans (Salicornia): Succulent plants in salt marshes. Salty, excellent raw or cooked. Recognize by segmented bright green finger-like stems. Beach peas (Lathyrus japonicus): Sandy beaches in northern regions. Young pods edible when cooked. Sea rocket (Cakile): Fleshy leaves on dunes worldwide. Peppery mustard-like flavor. All parts edible. Orache (Atriplex): Saltbush with arrow-shaped silvery leaves. Cook like spinach. Surprisingly high protein for a leafy green.
Other Sources
Sea urchins in tide pools and shallow water have rich, calorie-dense roe inside. Watch the spines. Tide pool fish are easy to catch by hand when water recedes. Small gobies and sculpins can be gutted and cooked whole.
General Foraging Rules
- Cook everything possible to kill parasites and bacteria.
- Avoid anything with chemical or ammonia smell.
- Start small with new foods, wait hours before eating more.
- Stay hydrated since salty foods increase water needs.
- Harvest at low tide for best access to the intertidal zone.
Coastal foraging is about calories and safety. Stick to positively identified foods, cook what you can, and the ocean will provide for those who know where to look.
