Where can the Sarawak swellshark egg be seen?

It is exhibited at LABO8 'The King of the Sea Sharks' on the 3rd floor of Aqua Museum, Yokohama Hakkeijima Sea Paradise.

What is the origin of this shark's name?

It inflates its body by swallowing water or air when threatened, known as the 'swell' defense, hence the name.

What is the habitat of the Sarawak swellshark?

It lives in deep-sea areas around 100–200m depth and grows up to about 40cm. Much of its ecology remains unknown.

When was the egg-laying confirmed?

Egg-laying was confirmed on June 7, 2026. The exact time is unknown.

Why is the eggshell transparent?

The transparent shell helps camouflage the egg in its surroundings, protecting it from predators.

Yokohama Hakkeijima Sea Paradise: Transparent Egg Resembling Glass Art on Display — Sarawak Swellshark Egg Exhibit

Published Jun 18, 2026 10:00 PM ・ Updated Jun 19, 2026 11:49 AM ・ 4 min read ・ Source: PR TIMES

Yokohama Hakkeijima Sea Paradise's Aqua Museum is showcasing a Sarawak swellshark egg laid on June 7, 2026 — the first such egg-laying event at the facility. Visitors can observe the embryo's development through its transparent, glass-like shell.

At the 'Aqua Museum' aquarium within 'Yokohama Hakkeijima Sea Paradise,' we are exhibiting a Sarawak swellshark egg laid on Sunday, June 7, 2026. This marks the first time this species has laid eggs at our facility.

The most distinctive feature of this shark is its ability to lay eggs with a beautifully transparent shell, resembling delicate glasswork. Through the clear casing, visitors can directly observe the baby shark (embryo) gradually growing inside the egg.

This rare egg is currently on display at LABO8, 'The King of the Sea Sharks — Discovering the World of Sharks with All Five Senses,' located on the 3rd floor of the Aqua Museum. We invite you to witness the pulsing heartbeat of life within the egg and observe its daily growth.

Our animal care team will continue to monitor the egg closely, hoping this exceptionally rare deep-sea shark egg will successfully hatch.

About the Sarawak Swellshark

The Sarawak swellshark is a member of the catshark family found in the western Pacific Ocean, including the South China Sea, Malaysia, and Taiwan. It primarily inhabits the seabed at depths of around 100 to 200 meters. The shark earned its name from its unique defensive behavior of swallowing water or air to inflate its stomach when threatened.

Among its relatives in the swellshark group, it is relatively small, reaching a maximum length of about 40 cm even when fully grown.

While it is believed that the transparent eggshell helps camouflage the egg against its surroundings to evade predators, the species' full ecology remains largely unknown.

Egg-laying confirmed: June 7, 2026 (Sunday) ※ Exact time unknown

Exhibition location: LABO8, 3rd floor of Aqua Museum, 'The King of the Sea Sharks — Discovering the World of Sharks with All Five Senses'

Size: Approximately 7 cm in length ※ Measured by the long axis of the egg case

<Sarawak Swellshark> English name: Sarawak swellshark Scientific name: Cephaloscyllium sarawakensis Distribution: Deep waters of the western Pacific (South China Sea, around Taiwan, Malaysia, etc.) Habitat: Seabed at depths of approximately 100–200 meters

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Source: PR TIMES
Category: Event

Yokohama Hakkeijima Sea Paradise: Transparent Egg Resembling Glass Art on Display — Sarawak Swellshark Egg Exhibit

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