From Japanese Bullhead Sharks to Dragon Moray Eels! Diving in Isu Oshima

At the start of July, we were in the waters around Izu Oshima. We could see Bullhead sharks, Dragon Moray Eels, and Hammerheads…We were there only for 2 days and one night but its only 1.5 hours away using the high-speed boat from Takeshiba Pier in Tokyo.

After we arrived in the early morning at the island, we had 3 dives, then the next morning grabbing another 3 dives, including being able to see the Hammerhead shark with sunrise, by the time we were back on the boat for going back, we had an 6 amazing dives under our belts! Isu Oshima is simply awesome.

Sea of Izu Oshima・The Undersea Geopark(1)

Sea of Izu Oshima・The Undersea Geopark(2)

Youtube : Dive in Izu Oshima

I was quite worried about the heat during the day, but the water temperature was 19 to 22 degrees ℃ which was fine in a dry suit. While taking a diving short course, we could observe so many fish, and on top of that, get some photos as well. The most memorable thing about the trip was our encounter with the Bullhead sharks.

The Bullheads are quiet-natured sharks, who often live in the seaweed beds. They are commonly seen in Izu while diving. The English name is ‘Bullhead Shark’ but the Japanese name of the sharks are “Neko-zame” which means “Cat (neko) + Shark (same).” It is named this because where the eyes of the shark are pointy like a cat’s ears at the top of the head, the overall shape makes the shark look like a cat’s face.

トラウツボ Doragon Moray 伊豆大島 Izu-oshima

The Dragon Moray Eel.

The English name was ‘Dragon Moray’ but the Japanese named it as ‘Torautsubo’ or a ‘Tiger’ (tora) +’Moray’ (utsubo).

This Green Sea Turtle has been given a name by the locals as ‘The Lord’ (Nushi) because it is so extremely large. Because it is not photographed with a person, it is hard to get the scale of just how big he is, but in all the diving I have done, it is the largest Green that I have ever seen. According to our guide, either he is getting too old or too big, but he just does not move very much from this spot.

Whip Coral Goby

This type of coral is called a Whip Coral and the fish that lives on it is a type of Goby fish.

In Japanese this fish is called a ‘Toshima Gimpo’ (Neoclinus toshimaensis). It is poking its head out of its burrow but only 1cm of it can be seen.

A Hammerhead shark at Keikai Beach. During this trip, we did not see that many of them, but it is always a little startling to see them swimming (we were at 12 meters depth as they passed directly overhead).

ツバメの巣立ち

Near the access to our diving area, there is a toilet which served as the home for this Pacific Swift nest- it was full. The next day, the babies had fledged and left the nest.

This is the outside of the lodging. There are many cats in this area. It was a very healing stay with nostalgic scenes like this and the friendly cats.

The fish we saw the most during this trip was the Chicken grunt (isaki). We also saw it on the menu at dinnertime!

If you are in Izu Oshima, you should try the bekko rice bowl (Bekkou don). We ate it as our last meal after the final dive, enjoying all the specialty items the island has to offer. There is a pickled sashimi that is placed on top of the sushi rice. And the beer after having a dive tastes so good.

In the evening, we took the ferry back to Takeshiba pier in Tokyo.

Image: Mariko SAWADA
Observation: JUL 2022, IZU OSHIMA
Special Thanks: Beach Line

Related topic       Youtube : Dive in Izu Oshima

Tags: , , , , , , , ,

Sea of Izu Oshima・The Undersea Geopark(1)

This is my report of diving in Izu Oshima. You can get there by jet foil boat in only 2 hours and is so surprising that it is this close to Metropolitan Tokyo.

It is a paradise for various sea creatures, which is great for photographers. The first thing we wanted to see was the Hammerhead Shark in the early morning hours, but I could also observe other things at the diving spots “Ou no hama 王の浜 (Kings Beach)” and “Aki no hama 秋の浜(Autumn Beach)”.

伊豆大島ダイビング Diving at Izu-oshima 王の浜のケヤリ (3)

This is a type of seaweed called ”KEYARI” in local language, Sporochnus radiciformis that we saw from “King’s Beach 王の浜”.  It is a popular subject for photo enthusiasts because of its beautiful peacock-like feathers, if you can manage to creatively get the right angle with some technique. It is widely distributed in the Japan sea, but it is said that the areas where the Kuroshio current passes through are more colorful.

ケヤリとテンクロスジギンポ Piano fanglenny 伊豆大島ダイビング Diving at Izu-oshima 王の浜(1)

Then this Piano Fangblenny who shares the area with the S. radiciformis. These little fish are found on the Pacific side of Japan and are only about 10 cm (4 inches) long. I saw in the same place, two times, but it never showed its entire body. This pose, poking it’s face out and with the S. radiciformis in the background was irresistibly cute.

テングダイ 王の浜 伊豆大島ダイビング Diving at Izu-oshima (2)

At “Ou no hama 王の浜” (King’s Beach), we also saw the Banded Boar head, a fish that stands out and grows to about 50 cm (20 inches). These were quite accustomed to divers.

テングダイのアゴヒゲ 伊豆大島ダイビング Diving at Izu-oshima 王の浜

Like Long barbeled grunter, it has fine whiskers on its lower jaw, which are said to be skin protrusions.

コケギンポ 伊豆大島ダイビング Diving at Izu-oshima 王の浜

Just as I was leaving the King’s Beach 王の浜, I stopped at this structure “Rock of Moss Fringehead.” This super cute and tiny collection of Moss Fringehead captured many divers attention and we were all trying to get a good photo while being swayed by the waves and current.

ムチカラマツ類とガラスハゼ

It was “Aki no hama 秋の浜 (Autumn Beach)” where I could observe the most variety creatures (it is also popular with other divers because of the easy access point).
This is a Whip coral goby attached to the whip coral.

ニシキフウライウオの伊豆大島ダイビング Diving at Izu-oshima 秋の浜 (2)

And diving to a deeper level, this Harlequin ghost pipefish could be seen. It’s hard to see because it’s camouflaged to look like the coral!

ニシキフウライウオの伊豆大島ダイビング Diving at Izu-oshima 秋の浜 (1)

The male Harlequin ghost pipefish mimics the coral almost exactly. They are a member of the Solenostomidae family, and was previously thought to be an intraspecific mutation, but in 1994, they were named as a separate species.

ニシキフウライウオのペア伊豆大島ダイビング Diving at Izu-oshima 秋の浜

This is a pair of Harlequin ghost pipefish. The female is pregnant, carrying the eggs in her belly.

ナンヨウハギ

The babies of the Palette surgeonfish.

オルトマンワラエビ 秋の浜

Ortmann’s spider-crab.

トラウツボ Dragon Moray 伊豆大島ダイビング 秋の浜 Diving at Izu-oshima (2)

Then, according to our guide Mr. Furuyama, the first thing that foreign divers request to see is this Dragon Moray Eel.

トラウツボ Dragon Moray 伊豆大島ダイビング 秋の浜 Diving at Izu-oshima

The Japanese name of this fish is “TORA-UTSUBO”, translated as Tiger moray eel. To me, it doesn’t look like a “tiger”, (the pattern seems more like a leopard), and the name “Dragon” seems accurate. But perhaps the most accurate description could be the “Qilin” which appears in Chinese mythology?

Photo & text: Mariko SAWADA
Observation: Sep 2021, Izu-oshima, Tokyo, JAPAN

Tags: , , , , , , , , , , , , , , , , , , , , , , , ,