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Hypseleotris compressa - Empire Gudgeon
June 21, 2011
8:08 am
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Colin
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Hi

I have had three males and two females Hypseleotris compressa for about two or three months and yesterday I split a pair off into their own tank because they were going through all the motions of spawning.

I had expected them to be cave/pipe spawners but from what i have seen and been reading they will lay eggs on just about any substrate of the aquarium. Problem is that I have just seen a quote that at 0.32mm, their eggs are the smallest of any vertebrate species!?

Is it then likely then that their fry should be moved into saline conditions and back again and fed on rotifers etc???

could be a challenge lol

Cheers
C

June 21, 2011
9:46 am
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coelacanth
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Wissing in the pind, IMO, but worth it for the colour of the displaying male, they glow in a way that has to be seen to be believed. Spawned them a number of times, thousands of fry each time, never seen anything like it. They would spawn on whatever surface was available, and the female would be virtually hollow afterwards. I think after ten spawns or so the female depletes her stock of oocytes, and that's game over. The fry act like planktonic organisms, all they do is wriggle to stay up in the water. Under the microscope they look like a bear trap with a tail, but never kept any alive for more than a few days, and never saw one feed on anything offered.
I think (distant memory now...) Mike Yamamoto had limited success in Hawaii by using the sun to culture planktonic algae in natural seawater and then letting the fry feed on whatever they could. Rotifers would beat these fry up, you need whatever rotifers feed on, maybe Nannochloropsis, but you'd also maybe need to get the saliinity right.

June 21, 2011
3:12 pm
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Colin
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meh, that's what I feared, thanks Pete.

I managed to rear melanopus clownfish once and that was a pain in the backside. I had to set up a plankton reactor and feed that with a drip coming from a phytoplankton reactor and then the phyto tube got inoculated with the rotifers by accident - and then it crashed and so on and so on lol

So, anyway I dont think I'll bother with the Hypseleotris this time round - shame as they are great wee fish and fun to keep, just not breed lol

July 18, 2011
11:05 pm
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Graham Ramsay
Blairgowrie - UK
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Picture of one of my males:

[Image Can Not Be Found]

The eggs are indeed spectacularly small:

[Image Can Not Be Found]

Got a video which I'll post in the "videos" section.

Attached files

[Image Can Not Be Found] [Image Can Not Be Found]

July 19, 2011
6:56 am
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Colin
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Good work Graham. My male is starting to really get that bump on the head now and although they breed all the time the other fish in the tank are just getting a snack from them!

Did you pick these up at the auction? I heard that there were some going?

I will be letting my last three go now if anyone is interested?

July 20, 2011
12:12 pm
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Graham Ramsay
Blairgowrie - UK
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QUOTE (Colin @ Jul 19 2011, 07:39 AM) < {POST_SNAPBACK}>
Did you pick these up at the auction? I heard that there were some going?

I wasn't able to get to the Livingston auction so i asked Steve Spencer to bring some up and John Reid picked them up for me. Swapped them for a bucket of green laser corys!

They must lay thousands of eggs, each time they spawn the entire bottom part of the sponge filter, including the underside of the sponge is covered with tiny eggs. Mine never last more than a day, the next morning they are always gone.

I'll lift the next lot and try them with some green water. You never know.

September 3, 2011
11:33 am
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Graham Ramsay
Blairgowrie - UK
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Still plugging away with these, trying various things. My record is 12 days. So they must be eating something /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

September 3, 2011
1:40 pm
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Colin
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very good, what size are they by day 12?

September 3, 2011
2:14 pm
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Graham Ramsay
Blairgowrie - UK
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QUOTE (Colin @ Sep 3 2011, 02:23 PM) < {POST_SNAPBACK}>
very good, what size are they by day 12?


Miniscule - maybe 3mm tops. They are free swimming (swim horizontal), hug the bottom and you can make out their eyes and pectoral fins. They still curl up and die though.
You can sometimes see them curl into a spring shape and strike at something.

September 3, 2011
4:08 pm
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Colin
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are they in marine water by that point?

September 3, 2011
4:44 pm
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Graham Ramsay
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QUOTE (Colin @ Sep 3 2011, 04:51 PM) < {POST_SNAPBACK}>
are they in marine water by that point?

Brackish. I'm going to try full marine next.

December 2, 2011
1:16 pm
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Graham Ramsay
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QUOTE (mummymonkey @ Sep 3 2011, 04:27 PM) < {POST_SNAPBACK}>
Brackish. I'm going to try full marine next.

Tried full marine and the results weren't so good. Feeding on nanochloropsis but still massive die off from day 5 onwards. At day 10 still too small for rotifers.

Will keep trying.

December 3, 2011
4:02 am
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unissuh
Australia
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Only mention I've heard of these being raised besides the guy in Hawaii are from Dave Wilson at Aquagreen (aquaculture facility in NT, Australia). Could try dropping him an email to see if he's got any tips, nice guy.

QUOTE (Dave)
I accidentally raised a batch as pollutants in my shrimp raising pond. You need foods down around the 10 micron size. Isolating these organisms and culturing them is rather difficult.

December 3, 2011
9:59 am
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Colin
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keep trying! /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

April 17, 2012
10:30 pm
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Graham Ramsay
Blairgowrie - UK
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Does anybody want to try and guestimate the number of eggs in the latest spawn /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" />

[Image Can Not Be Found]

Attached files

[Image Can Not Be Found]

April 18, 2012
2:26 pm
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oaken
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Haha. I must admit my first thought was "What eggs?!"

April 19, 2012
7:12 am
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Matt
Málaga, Spain
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The adult is a beast!

Cake or death?
April 19, 2012
4:56 pm
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Graham Ramsay
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QUOTE (Matt @ Apr 19 2012, 07:55 AM) < {POST_SNAPBACK}>
The adult is a beast!

It's certainly grown a bit since the start of the thread that's for sure.

Using photoshop I marked 10 eggs. I then drew a circle round them and duplicated it ten times to get a rough area that represented 100 eggs. I then duplicated that ten times to get 1000 eggs. I managed to fit this in about 24 times. So by my very rough estimate there are around 20 - 25 thousand eggs in the picture. Quite astonishing.

June 29, 2012
12:29 pm
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coelacanth
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You got any further with these?

June 29, 2012
11:46 pm
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Graham Ramsay
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coelacanth said
You got any further with these?

Spawn before last I got some up to 10 days.

That's about it for me.

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