Otocinclus arnoldi - Spawning

All posts regarding the care and breeding of these catfishes from South America.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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.
User avatar
bekateen
Posts: 6940
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 66
My cats species list: 109 (i:38, k:45)
My aquaria list: 29 (i:13)
My BLogs: 35 (i:122, p:1819)
My Wishlist: 39
Spotted: 133
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Awesome sauce! Congratulations!

Cheers, Eric
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
User avatar
Jools
Expert
Posts: 15107
Joined: Mon Dec 30, 2002 3:25 pm
My articles: 192
My images: 904
My catfish: 239
My cats species list: 89 (i:0, k:6)
My aquaria list: 2 (i:2)
My BLogs: 7 (i:5, p:194)
My Wishlist: 19
Spotted: 979
Location 1: M8
Location 2: Scotland
Interests: All things aquatic, Sci-Fi, photography and travel. Oh, and beer.
Contact:

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.
User avatar
Shane
Expert
Posts: 4370
Joined: Mon Dec 30, 2002 10:12 pm
My articles: 69
My images: 161
My catfish: 72
My cats species list: 4 (i:0, k:0)
My aquaria list: 4 (i:4)
Spotted: 89
Location 1: Tysons
Location 2: Virginia
Contact:

Re: Otocinclus arnoldi - Spawning

Post by Shane »

Fantastic write up and documentation! Well done.
-Shane
"My journey is at an end and the tale is told. The reader who has followed so faithfully and so far, they have the right to ask, what do I bring back? It can be summed up in three words. Concentrate upon Uganda."
Winston Churchill, My African Journey
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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.
User avatar
bekateen
Posts: 6940
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 66
My cats species list: 109 (i:38, k:45)
My aquaria list: 29 (i:13)
My BLogs: 35 (i:122, p:1819)
My Wishlist: 39
Spotted: 133
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Great!

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

Good luck,
Eric
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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.
User avatar
Jools
Expert
Posts: 15107
Joined: Mon Dec 30, 2002 3:25 pm
My articles: 192
My images: 904
My catfish: 239
My cats species list: 89 (i:0, k:6)
My aquaria list: 2 (i:2)
My BLogs: 7 (i:5, p:194)
My Wishlist: 19
Spotted: 979
Location 1: M8
Location 2: Scotland
Interests: All things aquatic, Sci-Fi, photography and travel. Oh, and beer.
Contact:

Re: Otocinclus arnoldi - Spawning

Post by Jools »

What age are the larger ones now?

Jools
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

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.
User avatar
bekateen
Posts: 6940
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 66
My cats species list: 109 (i:38, k:45)
My aquaria list: 29 (i:13)
My BLogs: 35 (i:122, p:1819)
My Wishlist: 39
Spotted: 133
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

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.
Eric
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

There are still a few fry around, but as they get bigger they are becoming harder to find as they venture throughout the entire tank more like the adults, but in miniture.
P1290515.JPG
I finally got some not so blurry photos of the adults for the catelog too.
Male:
P1290517.JPG
P1290522.JPG
Female:
P1290520(better).JPG
P1290526.JPG
And in another stroke of terrible luck, I lost the second female I had. I had moved her into a bare bottom tank to condition her before introducing a male, with the intent to then try to rear a second set of fry in a slightly more controlled situation. Sadly she inexplicably died two days later. So now the pressure is on to get this first, and now only, group successfully producing, because this is now the only female I have.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

I got a little bit better photo of the approximately 3 week old fry
P1310539.JPG

The adults have spawned another large batch :-BD . I did a cool water change two days ago, and so if that triggered it, it was quite delayed in comparison to how corys seem to react. Of the eggs I can see there are about 100, and who knows how many more on the sword plant and in the back of the tank:
P2010555.JPG
And interestingly, maybe around 5% of the eggs were laid with a defect of some sort:
P2010547.JPG
From the first batch these seemed to fungus over especially quickly, so I'm doing my best to remove the obviously defective eggs.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

The next wave have hatched.
_OI000001.JPG
From laying to hatching was a little less than 48hrs.
User avatar
bekateen
Posts: 6940
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 66
My cats species list: 109 (i:38, k:45)
My aquaria list: 29 (i:13)
My BLogs: 35 (i:122, p:1819)
My Wishlist: 39
Spotted: 133
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

Re: Otocinclus arnoldi - Spawning

Post by bekateen »

They're tiny! :-D
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

bekateen wrote: Thu Feb 04, 2021 2:17 am They're tiny! :-D
Indeed, and it's mind blowing how quickly they grow too!
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

Interesting, and that last wave of fry had a sudden die off today. Went from dozens of fry yesterday to few-to-none this evening. This is 8 days after hatching, which is about the same amount of time that passed on the first batch till their sudden die off.

I was more careful about not overfeeding, and haven't fallen behind on water changes. Which makes me wonder what is going on and pondering what variable(s) to try changing next. One thing I'm considering is adding leaf litter, though the fry generally hang out at the top of the tank, so I'm not certain about that yet.
User avatar
bekateen
Posts: 6940
Joined: Tue Sep 09, 2014 5:50 pm
I've donated: $40.00!
My articles: 4
My images: 66
My cats species list: 109 (i:38, k:45)
My aquaria list: 29 (i:13)
My BLogs: 35 (i:122, p:1819)
My Wishlist: 39
Spotted: 133
Location 1: USA, California, Stockton
Location 2: USA, California, Stockton
Contact:

Re: Otocinclus arnoldi - Spawning

Post by bekateen »

Sorry, man. That's too bad. Adding leaf litter is a good idea. Maybe also Spirulina powder or wetted Repashy powder (not prepared, just the powder mixed in water so it sinks).

Good luck!

Cheers, Eric
Image
http://youtube.com/user/Bekateen1
Would you like to buy my fish? Click HERE for prices.
Buying caves from https://plecocaves.com? Plecocaves is now sponsoring Bekateen's Fishroom. Use coupon code "bekateen" (no quotes) for 15% off your order.
OregonOutdoorsChris
Posts: 20
Joined: Thu Apr 07, 2016 6:00 pm
My images: 3
My cats species list: 20 (i:12, k:13)
My aquaria list: 8 (i:8)
My BLogs: 5 (i:18, p:268)
My Wishlist: 39
Location 1: Portland, Oregon
Location 2: USA

Re: Otocinclus arnoldi - Spawning

Post by OregonOutdoorsChris »

This has been a rough last month. Something went wrong with my tap water, some sort of foamy substance after a series of major rain storms. Before I realized there was an issue, the 4 remaining fry from the very first round of eggs, and which had gotten quite sizeable so I thought were out of the woods for any further loses, were all lost. The adults stopped eating, were acting stressed, and as expected were showing no further breeding behavior. So then I was stressed, second guessing every move and worrying about whether the next water change was going to help or hurt.

Fortunately the water quality issue seems to have passed. The adults are slowly getting back to eating. And to my absolute joy, I do appear to have a surviving fry! Given the size, I would guess this actually came from the very last batch of eggs about a month ago, so I'm stunned at how this one made it but its larger/older siblings didn't. Regardless, it gives me hope.

It seems to enjoy sweet potato...
20210307_185324.jpg
and I chuckled when I saw it on top of the Hisonotus this morning, it reminded me of the children's book "Are You My Mother?"
20210308_091716.jpg
Post Reply