Zoo Stock Species and the Red List

Zoo Stock

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This indicates that the species is included in the Second Zoo Stock Plan, which was formulated by the Tokyo Metropolitan Government in 2018. The plan sets goals for the next 10 years in three areas: "species conservation," "contribution to wildlife conservation," and "environmental education and conservation awareness." 124 animal species are included.

What is the Red List?

Based on scientific research, this is a list of wildlife classified by rank (category) indicating the degree of risk of extinction.
Livng Things Encyclopedia shows the categories (mainland and islands) assessed by the IUCN (International Union for Conservation of Nature) at the global level, the Ministry of the Environment for Japan, and the Tokyo Metropolitan Government for Tokyo.

The higher the category in each table, the higher the risk of extinction, and CR, EN, and VU are the three categories known as "endangered species." In Tokyo, species that are not at the NT (near threatened) level but are relatively rare are considered "species of concern."

IUCN categories

EX

extinction

EW

Extinction in the wild

CR+EN

CR

Serious crisis

EN

crisis

VU

emergency

NT

Near Threatened

LC・○

Low Concern

DD

Data shortage

LP

Japan (Ministry of the Environment) Category

EX

extinction

EW

Extinction in the wild

CR+EN

Endangered species

CR

Critically Endangered

EN

Endangered species

VU

Endangered species

NT

Near Threatened

LC・○

DD

Lack of information

LP

Endangered
local population

Tokyo Category

EX

extinction

EW

Extinction in the wild

CR+EN

Endangered species

CR

Critically Endangered

EN

Endangered species

VU

Endangered species

NT

Near Threatened

LC・○

Unranked

DD

Lack of information

LP

Endangered
local population

Creatures at Tokyo Sea Life Park

Common Octopus

Octopus vulgaris

マダコ
マダコ1
マダコ2

This is the most common type of octopus found along the Japanese coast. It is widely distributed as food, used in dishes such as sashimi, takoyaki, and takomeshi (octopus rice). It has a soft body and eight arms, each with suckers. It lives in rocky areas of shallow seas, utilizing crevices in the rocks. Its prey includes crustaceans such as spiny lobsters and shellfish such as abalone, and discarded seashells at the entrance serve as markers for its burrow.

classification Cephalopoda Octopoda Family Common Octopus
English name Common Octopus
distribution Coasts all over Japan except Hokkaido
Residence Rocky areas
Size
Total length: 60cm
food Crustaceans and shellfish
Red List
IUCN: LC (Least Concern)
Tokyo Sea Life Park exhibition area

The suckers shed their skin!?

マダコの吸盤

If you see something translucent and skin-like floating in the water of Common Octopus tank, it might be a molted sucker. Octopuses have many suckers lined up on their arms, and these suckers can attach themselves with great force, which is useful when moving around or catching prey. To maintain strong adhesive power, it's important for the suckers to molt and keep the adhesive surface clean at all times.

Octopus ink is used for smoke screen techniques, squid ink is used for cloning techniques.

Both octopuses and squid release ink to protect themselves, but their inks have different properties. Octopus ink is watery and spreads like mist when released. Squid ink, on the other hand, is highly viscous and floats around, taking shape as if another living creature were there. Perhaps this difference in properties is one reason why there is no octopus ink pasta.

Is an octopus headband a waist wrap?

The body structure of Common Octopus

Have you ever seen a picture of an octopus wearing a headband? Actually, the part that looks like a headband is the body, which contains the internal organs, and below that is the head, which has its eyes and mouth. Octopuses and squid belong to a group called cephalopods, and their body structure is different from humans; the head is below the body, and the arms (legs) are below the head. Let's take a look at their body structure.