I dont have a picture at the moment but I am sure you can find one my searching for mussels.
Mussels is a great source of :
Selenium, Vitamin b12 and Zinc as well as Folate.
Mussels can be cooked in its shell on a open fire and is some of the best survival food if you are close to a beach or stranded on a island.
Mussels are small but well worth the effort to get them. They are usually stuck on rocks and usually not that deep to get a few to eat.
Mussels have been a great source of food for years and in France its eating with fries as here in South Africa we eat it usually with other sea food.