30-40 heads.

Head is a quantity word for sea cucumber, and how many heads generally means how many there are in a pound. For example, 30-40 heads means there are about 30-40 sea cucumbers in a catty. The common sizes are 30-50 heads, 60-80 heads, and 80-110 heads. The larger ones are usually the ones you choose.

Farmed sea cucumbers are low in nutrition, while wild sea cucumbers are high in nutrition. At present, there is no pure wild sea cucumber in the coastal area of our country, the better farming method is seedling stocking and proliferation, after all, with artificial intervention, there is some difference in nutritional value and wild sea cucumber, but the price is relatively cheaper.

Sea cucumberInternal structure

Sea cucumber's endoskeleton is mostly undeveloped, and there are many tiny calcareous bone fragments that can only be seen with a microscope, which are buried underneath the skin, and the number of these fragments is generally large. Observation of bone fragments should make some treatment, the easiest way is to take a small piece of skin, placed on a slide, and then drop 1-2 drops of sodium hypochlorite solution on the skin for 1-2 minutes.

The sodium hypochlorite solution will corrode away the skin tissue and leave the bone fragments, then add 1-2 drops of distilled water, cover the coverslip, and put it under the microscope for clear observation. The beautiful and varied shapes of sea cucumber bone fragments are the most important basis for the classification of sea cucumbers. Common bone fragments include table-shaped body, buckle-shaped body, rod-shaped body, perforated plate, pattern-like body, wheel-shaped body and anchor-shaped body.