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3月 27, 2016の投稿を表示しています

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. Firefly squid,  Watasenia scintillans  (Berry, 1911) eggs drifting in underwater 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. Cydippida sp.  This Hormiphora has a secondary tentacles of yellowish. Size is 45mm. 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. 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. 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 an...

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. Clionidae 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。

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. Leucopsarion petersii  Hilgendorf, 1880