August 19, 2024

Cockle

On the sandy coasts and estuaries of Europe, a small marine treasure hides beneath the surface: the cockle. mollusk bivalve, whose scientific name is cerastoderma edules, has been a valued food and an important economic resource for coastal communities for centuries.

Characteristics of the Cockle

The cockle belongs to the family Cardiidae, a group of molluscs bivalves that are characterized by their heart-shaped shells. In fact, the name "Cardiidae" comes from the Greek "kardia," meaning heart. The cockle's most notable physical characteristics include:

Shell: Rounded and striated, usually cream or light brown.
Size: It typically ranges from 2 to 5 centimeters in diameter.
Radial ribs: Pronounced, providing structural strength and a distinctive appearance.
Internal body: Soft, with vital organs such as gills and a muscular foot.

Inside its protective shell, the animal has a soft body that includes vital organs such as gills, which it uses for both breathing and feeding, and a muscular foot that allows it to bury itself in the sand or, occasionally, make small movements.

Habitat

These mollusks have evolved to thrive in the intertidal zone, a challenging environment that alternates between exposure to air and complete immersion in salt water. During low tide, the cockles are buried in the sand, hermetically sealing their shells to retain moisture. When the tide rises, they emerge slightly and extend their siphons, two short tubes they use to filter the water in search of food and oxygen.

The ability of the cockle to adapt to changes in water salinity This is especially interesting. This allows them to live not only on coastal areas, but also in estuaries where freshwater from rivers mixes with the sea.

This adaptability has contributed to its wide geographic distribution, which ranges from the cold waters of Norway to the warmer coasts of Morocco, including the Mediterranean and Black Seas.

Diet and behavior

Its diet consists mainly of phytoplankton., tiny algae that float in the water, as well as on other suspended organic particles. A single adult cockle can filter several liters of water per hour in search of food.

Regarding its life cycle, the cockle It begins as a tiny planktonic larva, drifting on ocean currents. After several weeks, if it survives the many dangers of the open sea, The larva settles on the seabed and undergoes metamorphosis, developing its characteristic shell and adapting to benthic life.

Reproduction occurs through external fertilization: during the spawning season, which generally coincides with the warmer months, cockles release their gametes into the water, where fertilization occurs.

Nutritional values

Since time immemorial, the cockle has been prized as a delicious seafood delicacy. Its tender, juicy flesh, with a delicate flavor evoking the essence of the sea, has made it a prized ingredient in coastal cuisines throughout Europe.

But cockles aren't just delicious; they're also nutritious. Their nutritional profile includes:

nourisher	Quantity per 100 g
Sustainable	47 Kcal
Proteins	10,7 gr
Total lipids	0,5 gr
– Saturated fatty acids	0,05 gr
- Monounsaturated fatty acids	0,03 gr
– Polyunsaturated fatty acids	0,13 gr
Cholesterol	40 mg
Carbohydrates	0 gr
Fiber	0 gr
Water	88,8 gr
Football	128 mg
Iron	24 mg
Iodine	160 g
Magnesium	51 mg
Zinc	1,3 mg
Sodium	56 mg
Potassium	314 mg
Phosphorus	130 mg
Selenium	24,3 g
Thiamine	0,04 mg
Riboflavin	0,14 mg
Niacin equivalents	4,1 mg
Vitamin B6	0,1 mg
Folates	17 g
Vitamin B12	Traces
Vitamin C:	Traces
Vitamin A	250 g
Vitamin D	Traces
Vitamin E	0,4 mg

Source: Ministry of Agriculture, Fisheries and Food

To learn more about this Mollusk

Where are cockles found?

Cockles are found mainly along the coasts of the northeast Atlantic, from Norway to Morocco, including the Mediterranean and Black Seas. They inhabit intertidal zones and shallow waters.

How are cockles harvested?

Cockle harvesting, known as shellfish harvesting, is generally done by hand during low tide. Shellfish gatherers use special rakes or simply their hands to extract them from the sand.

Are cockles healthy?

Yes, cockles are very nutritious. They're high in protein, low in fat, and contain important vitamins and minerals such as vitamin B12, iron, zinc, and selenium. They're also a good source of omega-3 fatty acids.