What is a sea cucumber?

Sea cucumber, also known as sea rat or sea slug, is an marine echinoderm. There are over 1,200 species worldwide, with about 40 edible varieties. It lives in the deep sea bed where water temperatures are lower, feeding by filtering organic matter from the sand, earning it the nickname "scavenger of the sea." Dried sea cucumber, along with ginseng, bird's nest, and shark's fin, is one of the traditional "four great delicacies from the sea," and a top choice for Chinese nourishment. Among the traditional four great delicacies from the sea, there are also fish maw and bird's nest, and consuming them with cordyceps sinensis offers even more significant health benefits.

Dried Sea Cucumber

Common Edible Sea Cucumber Varieties

  • Japanese Kanto Sea Cucumber: Originating from Hokkaido, Japan, known for long, prominent spines and thick flesh. It is considered the king of sea cucumbers, commanding the highest market prices.
  • Dalian Liaoshen Sea Cucumber: Spiny sea cucumber from Dalian, mainland China, known for its plump flesh and neat spines. It is the most familiar high-grade sea cucumber in Hong Kong.
  • Russian Sea Cucumber: Sourced from cold waters, its nutritional content is similar to Liaoshen sea cucumber, offering good value for money.
  • South American Sea Cucumber: Large in size with thick flesh, commonly found in restaurant ingredient markets.
  • White Stone Sea Cucumber, Bald Sea Cucumber, Leopard Sea Cucumber: Each has its own market demand and is often used in home dietary therapy.

Nutritional and Medicinal Value of Sea Cucumber

Dried sea cucumber has a protein content of 50–70%, and is rich in 18 amino acids, sea cucumber saponins, sea cucumber mucopolysaccharides, and various trace elements (calcium, iron, zinc, selenium). Traditional Chinese medicine believes that sea cucumber is warm in nature and salty in taste, entering the heart and kidney meridians, offering benefits such as:

  • Nourishing the kidneys and essence, enriching blood and moistening dryness, improving soreness and weakness in the lower back and knees.
  • Boosting immunity and accelerating post-operative recovery.
  • Improving insomnia and combating fatigue.
  • Regulating blood lipids and protecting cardiovascular health.

Common preparations include: sea cucumber stewed with chicken, braised sea cucumber, sea cucumber porridge, and ginger and scallion sea cucumber. For high-end gift pairings with other dried seafood, refer to the Dried Seafood Gifting Guide.

Sea Cucumber Grading and Price Assessment

In the industry, "how many pieces per catty" is used as a specification unit. Fewer pieces per catty indicate a larger individual size and higher unit price. Taking Kanto sea cucumber as an example:

  • 20–30 pieces/catty: Top-grade specification, mostly used for high-end gifts.
  • 30–50 pieces/catty: High-end home use.
  • 50–80 pieces/catty: Mid-to-high grade.
  • Over 80 pieces/catty: Daily consumption grade.

In addition to specifications, color, spine prominence, integrity of the ventral surface, and rehydration rate (the multiple of volume expansion after soaking) all affect the price. High-quality sea cucumbers can have a rehydration rate of 5–8 times.

Sea Cucumber Storage Methods

Dried sea cucumber is most susceptible to moisture and insect infestation. It is recommended to divide it into airtight bags, vacuum-seal them, and store them in the freezer compartment of a refrigerator. It can be stored for over 5 years without deterioration. If slight dampness is noticed, it can be air-dried in a cool, ventilated place before resealing. Avoid prolonged storage in damp kitchen cabinets.

Kam Hoi Sing — Professional Sea Cucumber Recycling in Hong Kong

Beyond understanding the ecology of sea cucumbers, many customers ask about the value of their dried sea cucumbers at home. Kam Hoi Sing's Hong Kong sea cucumber recycling service professionally purchases various dried sea cucumbers, including Kanto sea cucumber, Liaoshen sea cucumber, spiny sea cucumber, and white stone sea cucumber, offering free appraisals and instant quotes. You can also browse the recycled sea cucumber product series page to see common varieties, or view sea cucumber recycling transaction case examples. If you have Japanese net abalone, Heming abalone, or other dried abalones at home, you are welcome to get an appraisal for them too.

Contact Kam Hoi Sing · Free Appraisal

For instant quotes, please add WhatsApp / WeChat: WhatsApp 852-69035182 　|　WeChat：jhc69035182

Service areas: All 18 districts of Hong Kong, Macau. Free on-site collection, instant cash payment, confidential process.

Further Reading

Frequently Asked Questions

Which sea cucumber variety is the most nutritious?
Typically, Japanese Kanto sea cucumber and Dalian Liaoshen sea cucumber have the highest collagen and trace element content, and are also the most expensive.
How do you rehydrate sea cucumber?
The traditional method is: soak in purified cold water for 48 hours (changing water every 12 hours), cut open the belly to remove the sand mouth and internal organs, then boil until soft.
Who should not eat sea cucumber?
Individuals with poor kidney function, gout, or those not yet recovered from a cold are advised to temporarily avoid consuming it.
How do you differentiate Kanto sea cucumber from Liaoshen sea cucumber?
Kanto sea cucumber originates from Hokkaido, Japan, has long and prominent spines, and a distinctly white underside; Liaoshen sea cucumber from Dalian has denser spines but is generally smaller in size. The most intuitive way is to look at the arrangement of the spines and the thickness of the flesh.
Is dried sea cucumber still valuable after a few years?
Dried sea cucumber, if sealed and frozen, can be preserved for over 5 years. As long as there are no insect infestations or rancid smells, it can still be appraised for recycling.