Temperature for pictus catfish

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MultipleTankSyndrome
Posts: 121
Joined: Thu Sep 30, 2021 11:07 am
Location: Loachaholica

Temperature for pictus catfish

Post by MultipleTankSyndrome » Thu Oct 27, 2022 6:00 pm

I just thought I'd share an interesting observation I made on the small pictus catfish I'm growing up in my second 473 liter until they get big enough to go into the originally archerfish 473 liter.
Their current water temperature is 20-22 Celsius (seems to vary a bit, IDK why), as opposed to the 24-27 Celsius most fishkeepers keep them at, and they've been that way for over 4 months. But no whitespot, no decrease in activity, and no decrease in appetite either. I'd say if your other fish can also do well at temperatures like that, you should set your pictus catfish tank to that temperature to save on the electricity bill.

This is pretty similar to the observation I made about the black and striped kuhli loaches that are also doing well at these temperatures compared to much higher 'recommended' temperatures.
473 liter (may be upgraded to large footprint 681) - black kuhli+clown loaches
110 liter - green neon+cardinal tetras, chain loaches
473 liter (planned) - Burmese+yoyo+zebra+striped kuhli loaches, roseline sharks, Odessa barbs, pink tail chalceus

Bas Pels
Posts: 360
Joined: Sat Nov 30, 2013 9:08 am

Re: Temperature for pictus catfish

Post by Bas Pels » Fri Oct 28, 2022 2:27 am

Pimelodus pictus comes from a huge area, and yes I think the ones from Peru, Colombia wll need lower temperatures then the Brasilian ones, from lowland Amazonia.

Still, I would not have guessed 22 C would suffice. I would have guessed around 25 C

Nice observation!!

MultipleTankSyndrome
Posts: 121
Joined: Thu Sep 30, 2021 11:07 am
Location: Loachaholica

Re: Temperature for pictus catfish

Post by MultipleTankSyndrome » Fri Oct 28, 2022 2:03 pm

Thanks. It does make one wonder what is at play.

My best guess would be that cold water flowing down from the Andes headwaters may be dropping the temperature of lowland water that would otherwise be warm. I've heard from another fishkeeping website that this is the case for the Magdalena - the person who I heard it from swam in the delta of the Magdalena and it was only in the low 20s Celsius despite the air temperature in the area of the delta being consistently much warmer all year.
https://en.wikipedia.org/wiki/Barranquilla#Climate

Come to think of it, I wouldn't be surprised if those pictus catfish were actually from the Magdalena, as I was told the shipment came in from Colombia. Wikipedia has the 4-line pictus catfish/P. blochii listed in fish from the Magdalena too, and that list is 'incomplete', so even though P. pictus is not listed I don't see why it couldn't be present if the 4-line pictus catfish is.

Mountain streams cooling waters of collection points might also be responsible for the kuhli loaches doing well at temperatures that low. I know that the Indo-Malayan region where kuhlis are collected has many cool mountain waters downflowing into tropical lowlands.
473 liter (may be upgraded to large footprint 681) - black kuhli+clown loaches
110 liter - green neon+cardinal tetras, chain loaches
473 liter (planned) - Burmese+yoyo+zebra+striped kuhli loaches, roseline sharks, Odessa barbs, pink tail chalceus

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