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Ajime-dojo (Niwaella delicata)
Posted: Sat Jul 11, 2009 9:15 pm
by odyssey
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
Other fish living with Niwaella delicata.
Rinogobius flumineus
Cottus pollux
Oncorhynchus masou ishikawae
previous post
http://forums.loaches.com/viewtopic.php ... a+delicata
Posted: Sat Jul 11, 2009 9:19 pm
by starsplitter7
Absolutely fantastic! Thank you for sharing.
Posted: Sat Jul 11, 2009 9:19 pm
by Matt
Amazing-looking place and among all the wonderful fish the Oncorhynchus looks fantastic!
Posted: Sat Jul 11, 2009 9:45 pm
by Jim Powers
Great pics and videos!!
Posted: Sat Jul 11, 2009 10:09 pm
by Gary Stanton
I like the salmon. Great pics!
Posted: Sun Jul 12, 2009 3:34 am
by Graeme Robson
Superb!!
Posted: Sun Jul 12, 2009 4:50 am
by ch.koenig
hi odyssey
great video and pictures. it looks just like in the swiss alps where I come from.!
do you have an idea obout the water parameters?
cheers charles
Posted: Sun Jul 12, 2009 11:16 am
by odyssey
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
Posted: Sun Jul 12, 2009 12:16 pm
by Jim Powers
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?
Posted: Sun Jul 12, 2009 1:37 pm
by Gary Stanton
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.
Posted: Sun Jul 12, 2009 2:23 pm
by NancyD
Great scenery & fish video, thanks odyssey!
Posted: Sun Jul 12, 2009 2:37 pm
by Jim Powers
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.
Posted: Sun Jul 12, 2009 3:53 pm
by Gary Stanton
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.
Posted: Sun Jul 12, 2009 4:22 pm
by Jim Powers
Well, after what I found, you are right...and wrong.
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.
Posted: Sun Jul 12, 2009 5:35 pm
by Gary Stanton
Jim Powers wrote:Well, after what I found, you are right...and wrong.
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?