Generally, an external fixator is mounted quite securely to the bone, and can withstand mild contact, any positioning of the body, and oftentimes even weightbearing immediately after surgery. In fact, it is often more comfortable to pick up the leg by grabbing the fixator, rather than holding the leg itself.he fixator is composed or one or more metal bars and rings, which in turn connect to a child via metal pins and wires. By gradually manipulating the fixator on the outside, we can carefully control the position of the bones and joints on the inside.
Habitat and Distribution. Pin this Image. Green sea urchins used to live in cold waters of the sub Polar Regions. They live in Northern cooler part of the Pacific and Atlantic Ocean. Some also live in the Arctic too. The sea animal can be found in rocky sea beds. They often live in the low depth tidal zones.
The market value for sea urchins in Japan ranges from $2.20 to $43.00 per tray. In 1994, Japan imported over 6130 metric tons of sea urchins, totaling a value of 251 million dollars. Sea urchin harvesting is one of the highest valued fisheries in California, bringing about 80 million dollars in export value per year.urple sea urchins are found on the pacific coastline from Alaska to Cedros Island, Mexico. Above the low tide line, these urchins often live in rounded depressions in the rock which slowly erode with their teeth and spines.