1. Pure wild sea cucumbers come in different colors and sizes; farmed sea cucumbers look like they are carved out of the same mold. Pure wild sea cucumbers grow in different places in the sea. Some will turn stone color on stones and green on seaweed... 2. It is normal for pure wild sea cucumbers to have sand, but cultured sea cucumbers will not have sand. Wild sea cucumbers feed on sediments - seafloor sediments, digesting microorganisms including various diatoms, protozoa and seaweed fragments. The digestive tract of sea cucumbers...3. Pure wild sea cucumbers have spines of varying thicknesses, which are thick and powerful, with dense bones and thick legs; farmed sea cucumbers have spines and legs that are slender and sharp. Wild sea cucumbers grow in the deep sea, where there are turbulent currents and rock friction.