Soon departure
Palau DayDream RYOMA-1 Midnight Dive & Black Water Dive® collaboration cruise.
9th to 17th, Apr 2016.
写真家峯水亮がプロデュースする、Black Water Dive®のオフィシャルサイトです。（たまにブルーウォーターの写真も掲載します）潮や時間・場所をよみながら、高演色の水中ライトを夜の海に仕掛けて潜ります。見られる生物は日中のダイビングや普通のナイトダイビングではまず見ることのない、稚魚や幼生など魅力的な生き物ばかり。このサイトでは開催した時の様子や見られた生物などの他、今後のBWDスケジュールもご紹介いたします。 "BWD"はBlack Water Dive®の略です。Black Water Dive®は写真家峯水亮の登録商標(商標 第5812594号)です。
2016年4月8日金曜日
2016年4月5日火曜日
Larva of Pleuronectes yokohamae Günther, 1877 from Toyama Bay
Japanese common name: Mako-garei
Latin name: Pleuronectes yokohamae Günther, 1877
"Mako-garei" have a wide distribution to Japanese-sea. Image was taken in mid-March.
In the larva that seen in this season was the top dominant species.
REFERENCES
Okiyama M. ed (2014) An Atlas of Early Stage Fishes in Japan Second Edition Tokai University Press, Japan. :217–268. (in Japanese).
Kojima J (2014) ウッカリカサゴのブログ-仔稚魚スケッチ-カレイ科
Latin name: Pleuronectes yokohamae Günther, 1877
"Mako-garei" have a wide distribution to Japanese-sea. Image was taken in mid-March.
In the larva that seen in this season was the top dominant species.
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| Juvenile of Pleuronectes yokohamae Günther, 1877 (size: about 12mm) |
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| more younger size: 10mm |
REFERENCES
Okiyama M. ed (2014) An Atlas of Early Stage Fishes in Japan Second Edition Tokai University Press, Japan. :217–268. (in Japanese).
Kojima J (2014) ウッカリカサゴのブログ-仔稚魚スケッチ-カレイ科
2016年4月1日金曜日
The Firefly squid of Toyama Bay
English name: Firefly squid
Latin name: Watasenia scintillans (Berry, 1911)
Toyama Bay is famous for Firefly squid production. That mainly season is between March to May. This season is for Spawning. Distribution of Firefly squid is around Japan of Okhotsk Sea from coast of South Japan. Among them, the largest Firefly squid live in Toyama Bay, common size is ML70mm. It's much larger than those of other regions.
REFERENCES
Watasenia scintillans - Tree of Life Web Project
Latin name: Watasenia scintillans (Berry, 1911)
Toyama Bay is famous for Firefly squid production. That mainly season is between March to May. This season is for Spawning. Distribution of Firefly squid is around Japan of Okhotsk Sea from coast of South Japan. Among them, the largest Firefly squid live in Toyama Bay, common size is ML70mm. It's much larger than those of other regions.
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| Firefly squid, Watasenia scintillans (Berry, 1911) |
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| eggs drifting in underwater |
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| Two to four large organs covered by black chromatophores on tips of arms IV. |
REFERENCES
Watasenia scintillans - Tree of Life Web Project
Some jellies in early spring of Toyama bay.
In early spring of Toyama Bay, we were able to find meny number of jellies. Among them, the comb jellyfish was seen many. Sea temperature is 10 or 11 degrees celsius.
This Cydippida sp. of size is about 20mm. it's had mature eggs.
This Hormiphora has a secondary tentacles of yellowish. Size is 45mm.
Aglantha digitale is one of Trachymedusae. In early summer from spring, It can see the coast of Hokkaido from Northeast and Hokuriku Japan. Umbrella of muscular glow to rainbow colors depending on the angle of light.
Beroe mitrata looks like Beroe forskalii. but, the pharynx of Beroe mitrata is characteristic by dyed red.
This individual is still young, size is only about 30mm.
Cyclosalpa bakeri habittat around from 45 degrees north latitude to near 40 degrees south latitude of East Atlantic, Pacific Ocean and Indian Ocean.
Thetys vagina is biggest in solitary zooid of Salpida. This individual size is about 170mm.
REFERENCES
Ryo Minemizu et al ,2015 A Photographic Guide to the Jellyfishes of Japan. 360pp. Heibonsha, Tokyo Japan. (in Japanese)
This Cydippida sp. of size is about 20mm. it's had mature eggs.
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| Cydippida sp. |
This Hormiphora has a secondary tentacles of yellowish. Size is 45mm.
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| Hormiphora sp. |
Aglantha digitale is one of Trachymedusae. In early summer from spring, It can see the coast of Hokkaido from Northeast and Hokuriku Japan. Umbrella of muscular glow to rainbow colors depending on the angle of light.
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| Aglantha digitale (Müller, 1776) |
Beroe mitrata looks like Beroe forskalii. but, the pharynx of Beroe mitrata is characteristic by dyed red.
This individual is still young, size is only about 30mm.
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| Young of Beroe mitrata (Moser, 1908) |
Cyclosalpa bakeri habittat around from 45 degrees north latitude to near 40 degrees south latitude of East Atlantic, Pacific Ocean and Indian Ocean.
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| Aggregate zooid of Cyclosalpa bakeri Ritter, 1905 |
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| Aggregate zooid of Cyclosalpa bakeri Ritter, 1905 |
Thetys vagina is biggest in solitary zooid of Salpida. This individual size is about 170mm.
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| Solitary zooid of Thetys vagina Tilesius, 1802 |
REFERENCES
Ryo Minemizu et al ,2015 A Photographic Guide to the Jellyfishes of Japan. 360pp. Heibonsha, Tokyo Japan. (in Japanese)
Unidentified Clionidae species in Toyama Bay.
We did pre Black Water Dive® at Namerikawa of Toyama Bay from 18th Mar to 20th Mar. Sea temperature was 10 degree. Visibility is not very well at that time, the results are were few. Most that we have found, it's common in the drifting plankton and nekton. However, there was a new discovery.
This is a very small Clionidae species. Size only 2mm. Cilia ring is three-stage.
So far, C, limacina limacina has not a report from Toyama Bay.
This species has also been reported from water sampling facilities of deep sea water of Toyama so far, and it has been found to be a new species.
Oct/12/2017 Postscript
There seems to be some announcement today.
http://www.tokyo-np.co.jp/s/article/2017101201000867.html
http://www.sanyonews.jp/article/610835/1/
富山湾で発見されたクリオネの仲間ですが、蘭越町貝の館の山崎さんや富山大学らの共同研究により、新種記載されることになりました。
This is a very small Clionidae species. Size only 2mm. Cilia ring is three-stage.
So far, C, limacina limacina has not a report from Toyama Bay.
This species has also been reported from water sampling facilities of deep sea water of Toyama so far, and it has been found to be a new species.
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| Clionidae species |
There seems to be some announcement today.
http://www.tokyo-np.co.jp/s/article/2017101201000867.html
http://www.sanyonews.jp/article/610835/1/
富山湾で発見されたクリオネの仲間ですが、蘭越町貝の館の山崎さんや富山大学らの共同研究により、新種記載されることになりました。
Leucopsarion petersii Hilgendorf, 1880 of Toyama Bay
TL: about 50mm
Japanese common name: Shiro-uo
English name: Ice-goby.
Latin name: Leucopsarion petersii Hilgendorf, 1880
Ice-goby famous is also in Toyama Bay. It's inhabit the coast of the shallow sea, and eat of plankton. also, gather well in front of the light at Black Water Dive®. Adult is run-up to the lower reaches of the river in early spring for spawning. The silver color in the center of the body is the air bladder. This picture is female.
Japanese common name: Shiro-uo
English name: Ice-goby.
Latin name: Leucopsarion petersii Hilgendorf, 1880
Ice-goby famous is also in Toyama Bay. It's inhabit the coast of the shallow sea, and eat of plankton. also, gather well in front of the light at Black Water Dive®. Adult is run-up to the lower reaches of the river in early spring for spawning. The silver color in the center of the body is the air bladder. This picture is female.
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| Leucopsarion petersii Hilgendorf, 1880 |
2016年1月26日火曜日
Larva of Blanket Octopus,Tremoctopus gracilis (Eydoux & Souleyet, 1852) Tremoctopodidae.
This larva of a Blanket Octopus was taken at Omi Island Yamaguchi Prefecture Japan.
Omi Island is located in the Sea of Japan coast of Yamaguchi Prefecture.
This larva of mantle length was about 4mm.
Mantle is translucent, brachial membrane envelops head and arms.
Ciliary process are lined to Mantle.
Among the larvae of the arm, dorsal arms is the most developed and the other arm is quite short.
Dorsal arms has very large suckers. Sucker is gradually to bigger from the tip, and the largest sucker is fourth from the tip. Web of arms is not yet developed.
Chromatophores present on inner edge of each sucker, and absent on funnel.
Orange large iridophores are arranged around the eyes.
Omi Island is located in the Sea of Japan coast of Yamaguchi Prefecture.
This larva of mantle length was about 4mm.
Mantle is translucent, brachial membrane envelops head and arms.
Ciliary process are lined to Mantle.
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| Lateral view |
Dorsal arms has very large suckers. Sucker is gradually to bigger from the tip, and the largest sucker is fourth from the tip. Web of arms is not yet developed.
Chromatophores present on inner edge of each sucker, and absent on funnel.
Orange large iridophores are arranged around the eyes.
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| Dorsal view |
Mantle typically triangular in shape.
Dorsal mantle scattered with chromatophores.
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| ventral view |
Large eyes are facing the ventral.
Ventral mantle patterned with a band of yellow from red chromatophores along anterior margin.
Other Notes;
Often, adult of Tremoctopus gracilis appear to Omi Island in late summer. Genus Tremoctopus are pelagic octopus that live on the surface to 250m. And also known to feed on Pteropod Molluscs and small fishes. Larva often known that hold on Physalia tentacles in arms I and II.
REFERENCES
Sweeney, M.J., Roper, C.F.E., Mangold, K.M., Clarke, M.R., and Boletzky, S. v. 1992. 'Larval' and juvenile cephalopods: a manual for their identification. Smithsonian Contributions to Zoology - No. 513. 282pp.
Norman, M.D. 2000. Cephalopods A World Guide. Frankfurt, Germany, IKAN Publishing. 320 pp.
Jereb,P., Roper,C.F.E.,Norman,M.D.,Julian,K.F., 2014. Cephalopods of the World. An annotated and illustrated catalogue of Cephalopod species known to date Volume 3 Octopods and Vampire Squids. FAO Species Catalogue for Fishery Purposes No.4, Vol.3. 382pp.
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