Rhinogobius flumineus

[mikev]

Preliminary photos, not very good...





Video:

http://youtu.be/eXv-qM7eN2g

Relevance:

This species occurs in the same streams as N.delicata.

Preliminary observations:

More aggressive males than any *small* rhinogobius I've kept. "White lip" seems to be a male feature, and white intensifies when a male feels assertive.....

Note: 2nd and 3rd images are too large and not shown correctly in this post (or I don't know how to) to see them, right click and "Show Image"

[Jim Powers]

Nice!

[odyssey]

Hi mikev !

Rhinogobius flumineus is not a amphidromous Unlike many of the other Rhinogobius.
They lay a small number of large eggs.
They complete the life only in the river in freshwater.

This is an excellent photo sites.
http://goma-mongara.net/g-blog/2011/07/ ... %E8%AD%B7/

This is the video clip of the courtship action in a water tank.
https://www.youtube.com/watch?v=ZE_CmsZnjFA

One of my video clip in a river.
https://www.youtube.com/watch?v=wMpQM2x9g2E

These are Rhinogobius flumineus that live in various parts of Japan.
They do not migrate in the ocean.
Therefore their patterns are often different depending on the region.
(1)The river which flows into the Gulf of Ise in Gifu

(2)The river which flows into the Gulf of Ise in Mie

(3)The river which flows into the Gulf of Suruga in Yamanashi

(4)The river which flows into the Seto Inland Sea in Ehime

(5)The river which flows into the Seto Inland Sea in Hiroshima

(6)The river which flows into the Gulf of Osaka in the Kyoto

(7)The river which flows into the Gulf of Osaka in the Nara

(8)The river which flows into the Sea of Japan in Gifu

(9)The river which flows into the Sea of Japan in Ishikawa

(10)The river which flows into the Sea of Japan in Shimane

(11)The river which flows into Lake Biwa in Shiga

[mikev]

Thank you for good news. Small number of large eggs is good.... then they are probably artemia-capable, I was afraid of small fry like r.leavelli.

Do you have any sense where mine might have come from?

This photo of yours: http://tanzawa-sky-club.air-nifty.com/p ... 0/30/y.jpg
seems to match my fish closely, perhaps the location of it can be found out?

[odyssey]

Do you have any sense where mine might have come from?

I can't judge the habitat only by having looked, but may judge it to be it if possibly I taste.

[mikev]

Your underwater clip is fantastic btw.

[mikev]

They lay a small number of large eggs.

Seem correct (How do I know this? ), but "small number" is actually more than I've seen with diospilus or zhoui.... and the fry is not uber-sensitive like same zhoui, it seems.

Work in progress, happy end is not guaranteed....

[odyssey]

The incubation of the egg, congratulations.!!
I look forward to future growth.

[mikev]

Thank you!

The eggs are now > 15mm, running around, very fat and very nasty to each other, much worse than other rhino fry I've had. I lost some, but not too bad.

I'll show the babies when I have a chance.

[mikev]

OK... here is the update: the babies are at 1" now, cannot be sexed yet, but look like real fish. Growth much slower now, I'd think at least six months to adulthood.

There was a second spawn, and near total disaster
The male decided not to service it .. so I removed the eggs very early, two days after the spawn... this is very bad, of course, but no choice... the result was many premature hatches (all died) plus sudden rapid fungus outbreak (despite me using anti-fungal)... anyway, out of about 30 eggs (not all fertilized) I only ended up with 8 normal hatches... and at least five normally developing babies (hard to see in this tank, maybe more).

Not the worst result but could have been better.

[odyssey]

Hi mikev!

I do celebration of their having grown up to 1 inch.
I do condolences of the second breeding having been exterminated.

[mikev]

Thanks, Odyssey,

They do seem easier to breed than average rhinogobius....more often in the mood and not too picky about breeding spots... and giving them grindals clearly has a positive effect on breeding.

Meanwhile, I'm in a state of fear for a few days.... one of the rhinos in another group, r.henchuenensis is missing since yesterday.... they were behaving unusually for a couple of days before (courting)... so either he is sitting on the eggs somewhere deep inside the tank where i cannot see or he is dead ... and I cannot search the tank since if it is the former I cannot risk spooking him.
I've been waiting for this for two years... got to wait a week now.