Otocinclus arnoldi - Spawning

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OregonOutdoorsChris
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Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

It's been an incredibly exciting week for fish stuff in my house, as my Otocinclus arnoldi have spawned! I've already documented much of the details in the Breeding Log: https://www.planetcatfish.com/common/my ... es_id=6961 but figured I'd share some extra details and videos as well.

On Monday I moved a male and female Otocinclus arnoldi into a tank I had been preparing for just them. Thanks to working from home, I was around the next morning to see what appeared to be the start of courtship/spawning, and so little else got accomplished for the next several days as I sat nearby with a camera :-).

By all indications, they seem to spawn a lot like C. paleatus, preferring temperatures at or below 75F/24C. They're unfussy about pH, with my tap being fairly standard municipal water of a pH in the mid-7s, and I do nothing to alter it.

They produce very small eggs of just barely 1mm in diameter. Which now that I know for certain what their eggs look like, I believe I have seen their eggs in the community tank they were in previously, but in that other tank the eggs were quickly eaten by the various community fish.

On their first pass, a dozen or so eggs were distributed fairly evenly throughout the tank, but they eventually came to favor the glass of the tank which gets sun from a south facing window, and ended up laying the bulk of maybe around 100 eggs there. The location might just be a coincidence, but my hypothesis is that maybe they feel that location will offer the fry more food. Idk.

I did not remove the eggs from the tank for this first experience with them laying, and have been rewarded with several dozen fry having hatched by this morning. Though there was some fungus-ing of the eggs, so in the future I will experiment with removing and treating them with methylene blue.

Pre-Spawn
Courtship & Cleaning
Spawning
Eggs shortly before hatching
Hatchlings
Now onto the next adventure of rearing the fry... I'll do my best to report back with my experience.
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bekateen
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Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Awesome sauce! Congratulations!

Cheers, Eric
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Re: Otocinclus arnoldi - Spawning

Post by Jools »

Those videos are great, I find video of spawning tanks are really helpful for all levels of fishkeeper. Good luck rearing the fry and I look forward to hearing, or seeing, how you got on.

Cheers,

Jools
PS Good to see it's the real Otocinclus arnoldi too. They're often misidentified.
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Re: Otocinclus arnoldi - Spawning

Post by Shane »

Fantastic write up and documentation! Well done.
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OregonOutdoorsChris
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Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

Thank you everyone.

The fry seem to be doing well so far, with what seems to me like a fair amount of growth, but granted it's only been a couple of days.

Compare freshly hatched on the 8th
P1080454.JPG
With today the 10th
P1100463.JPG
same camera zoom in both photos.
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Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Great!

Dude, you've got some seriously green algae there! :)) No wonder they're doing so well.

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Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

bekateen wrote: Mon Jan 11, 2021 5:50 amDude, you've got some seriously green algae there! :)) No wonder they're doing so well.
Unfortunately no green water, since all my tanks are in the living space I have to keep them at least somewhat aesthetically pleasing, and I'm pushing my luck as it is by leaving all the brown algae on the glass.

The green was just a blurry sword plant in the background, here's some other photos I took at the same time in a different part of the tank.
P1100458.JPG
P1100460.JPG
OregonOutdoorsChris
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Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

At 7 days old, they continue to grow with very little input from me. Each morning and evening, I feed a pinch of repashy soilent green powder, a pinch of spiralina flake I roll between my fingers to grind up more finely, and a pinch of freeze dried copepods. Whether the young are eating any of that, or are otherwise just making do with the naturally occurring aufwuchs in the tank, I don't know.
P1150494.JPG
I also now have multiple age classes present. I would guess that the larger fry in this photo is probably around 4 days old, and the other is freshly hatched. The adults seem to have a round of egg laying every 2-3 days.
P1150501.JPG
Last edited by OregonOutdoorsChris on Sun Jan 17, 2021 3:36 am, edited 3 times in total.
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Re: Otocinclus arnoldi - Spawning

Post by Jools »

What age are the larger ones now?

Jools
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Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

Jools wrote: Sat Jan 16, 2021 8:57 am What age are the larger ones now?

Jools
The photo of the biggest one is at 7 days.
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Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

To keep any interested parties informed of how things are going, sadly I had a major die off of fry this week. I think I got a little too overzealous with the feeding and as a result water quality suffered. Fortunately, there's still a handful that have survived, including what appear to be some from the first batch of eggs, so it isn't a complete set back. But it sure took the wind out of my sails when I went from too many fry to count to you can count them on one hand.
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Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Dang, sorry Chris. But don't feel too bad. I've had so much die off from all my Rineloricaria eigenmanni and Trachelyichthys exilis spawns it's almost numbing. But as long as at least a few are surviving, it's worth it and hopefully we get better with experience.

Keep it up.
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