Ajime-dojo (Niwaella delicata)

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odyssey
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Ajime-dojo (Niwaella delicata)

Post by odyssey » Sat Jul 11, 2009 9:15 pm

There was the opportunity when I traveled to the habitat of Ajime-dojo(Niwaella delicata) last week.

Because I succeeded in underwater photography of Ajime-dojo(Niwaella delicata), I show it.
I had a hard time to fix a camera for a fast flowing stream.
They are Japanese endemic species to live in the mountain stream.
They are glazing of the adhesion alga of the rock surface.

The movie in the wild stream is here.
http://www.youtube.com/watch?v=EBOB2XaDsRE

It is two of them which it is breeding now which it introduced a movie to before.
http://www.youtube.com/watch?v=zoZzFpYGJYk

Niwaella delicata
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Other fish living with Niwaella delicata.
Rinogobius flumineus
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Cottus pollux
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Oncorhynchus masou ishikawae
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previous post
http://forums.loaches.com/viewtopic.php ... a+delicata
Last edited by odyssey on Sat Jul 11, 2009 9:23 pm, edited 1 time in total.
I am not used to English. Therefore,It is likely to sometimes misunderstand it.
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starsplitter7
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Post by starsplitter7 » Sat Jul 11, 2009 9:19 pm

Absolutely fantastic! Thank you for sharing.
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Matt
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Post by Matt » Sat Jul 11, 2009 9:19 pm

Amazing-looking place and among all the wonderful fish the Oncorhynchus looks fantastic!
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Jim Powers
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Post by Jim Powers » Sat Jul 11, 2009 9:45 pm

Great pics and videos!!
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Gary Stanton
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Post by Gary Stanton » Sat Jul 11, 2009 10:09 pm

I like the salmon. Great pics!
"Beware of the fish people, they are the true enemy."
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Graeme Robson
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Post by Graeme Robson » Sun Jul 12, 2009 3:34 am

Superb!! 8)
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ch.koenig
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Post by ch.koenig » Sun Jul 12, 2009 4:50 am

hi odyssey
great video and pictures. it looks just like in the swiss alps where I come from.! :D
do you have an idea obout the water parameters?
cheers charles
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odyssey
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Post by odyssey » Sun Jul 12, 2009 11:16 am

Hi everyone.

Unfortunately the water temperature does not measure it.
However, probably it will be around 15 degrees C because it was considerably cold.

There are water temperature / the water data of the lower basin more than 100km.
As for the water temperature, the neighborhood of 19 degrees C, the pH were 7 in a lower basin.
http://www1.river.go.jp/cgi/DspWquaData ... KAWABOU=NO

Water of Japanese this neighborhood is the standard water.
It is quite soft water of pH 7.

Oncorhynchus masou ishikawae is called "Amago".
"Amago" is a meaning called the rainy child.
An orange small spot is special.

It is a collection of images of "Amago".
http://images.google.co.jp/images?q=%E3 ... e&resnum=1

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I am not used to English. Therefore,It is likely to sometimes misunderstand it.
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Jim Powers
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Post by Jim Powers » Sun Jul 12, 2009 12:16 pm

The "Amago" is one beautiful salmonid!
Its interesting that is retains the par marks into adulthood.
Most members of the genus Oncorhynchus such as the rainbow trout (Oncorhynchus mykiss) lose the marks as they mature.
Although I think a few subspecies of the rainbow trout do keep them to some degree.
Does the "Amago" spawn in fresh water or salt or both?
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Gary Stanton
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Post by Gary Stanton » Sun Jul 12, 2009 1:37 pm

Jim Powers wrote:The "Amago" is one beautiful salmonid!
Its interesting that is retains the par marks into adulthood.
Most members of the genus Oncorhynchus such as the rainbow trout (Oncorhynchus mykiss) lose the marks as they mature.
Although I think a few subspecies of the rainbow trout do keep them to some degree.
Does the "Amago" spawn in fresh water or salt or both?
All salmonids spawn in fresh water. Great looking adults is right.
"Beware of the fish people, they are the true enemy."
-- Frank Zappa, speech to a pro-choice rally in Los Angeles around 1989-90
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NancyD
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Post by NancyD » Sun Jul 12, 2009 2:23 pm

Great scenery & fish video, thanks odyssey!
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Jim Powers
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Post by Jim Powers » Sun Jul 12, 2009 2:37 pm

Oncorhynchus masou ishikawae
Actually what I meant to say was "do they LIVE in fresh water, salt water or both?".
But, thanks for the clarification, Gary.
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Gary Stanton
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Post by Gary Stanton » Sun Jul 12, 2009 3:53 pm

Jim Powers wrote:
Oncorhynchus masou ishikawae
Actually what I meant to say was "do they LIVE in fresh water, salt water or both?".
But, thanks for the clarification, Gary.
Good question. By their look I would guess they are fresh water. I'm curious now. After investigating I would be wrong. They migrate to the ocean. Typical salmon.
"Beware of the fish people, they are the true enemy."
-- Frank Zappa, speech to a pro-choice rally in Los Angeles around 1989-90
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Jim Powers
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Post by Jim Powers » Sun Jul 12, 2009 4:22 pm

Well, after what I found, you are right...and wrong. :wink:
I guess there are two forms of this fish, one sea-run and one fresh water. Just like rainbow trout/steelhead in the same genus.
Salmo masou Brevoort, 1856, Japan. There are two subspecies: one, Oncorhynchus masou masou, spawns in the sea; the other, restricted to freshwater, is yamame, or Oncorhynchus masou ishikawae.
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Gary Stanton
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Post by Gary Stanton » Sun Jul 12, 2009 5:35 pm

Jim Powers wrote:Well, after what I found, you are right...and wrong. :wink:
I guess there are two forms of this fish, one sea-run and one fresh water. Just like rainbow trout/steelhead in the same genus.
Salmo masou Brevoort, 1856, Japan. There are two subspecies: one, Oncorhynchus masou masou, spawns in the sea; the other, restricted to freshwater, is yamame, or Oncorhynchus masou ishikawae.
Oncorhynchus masou masou is the one I got the info from, some consider it as the only species. I don't think it spawns in the sea though, it returns to the sea. Spawns in streams.
I should have stuck with my original guess, huh?
"Beware of the fish people, they are the true enemy."
-- Frank Zappa, speech to a pro-choice rally in Los Angeles around 1989-90
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