Back in November 2022 (this post), I imported 4 Amblydoras nauticus from a creek off the Rio Nanay outside of Iquitos, Peru. Today I discovered four ... correction, five... fresh eggs! Tank setup is a 20-gallon long with a thin layer of sand substrate. The tank gets a 70% water change every two weeks with a 50-50 mix of tapwater and RO water, the tapwater dechlorinated. Decorations include a few bamboo pipes, about 1" to 1.5" diameter and about 4" long, a couple of pieces of wood (branches really, not blocks of wood), a small terra cotta pot with a small Crypt plant in it, and a spawning mop hanging from a cork. There is also a small Pothos plant hanging out of the tank, with its roots in the water. The tank has a sponge filter with a modest air flow (not strong, but not trivial). I initially fed them live California blackworms, but for the last few months, those haven't been available, so I switched to frozen bloodworms two months ago. There is an LED light on a 12 hr timer.
I've made a few changes earlier this week, any one (or all) of which may have been triggers to spawning:
- The heater used to be set at 76F. Two days ago I bumped it up to 78F.
- Also two days ago, I switched the light from its "white light" setting to a "blue light" setting.
- Previously, I was feeding them every other day or daily, but three days ago I upped the feedings to 2x - 3x per day.
- Finally, (and just to be clear, I didn't make this change; it just happened ), it's been raining a lot in my region, so the weather may have been a factor.
The eggs are slightly oblong, just over 1 mm on their long axis, and have a pale amber color with a significant transparent jelly coat around them.
I hope they develop, and you know I'll be hunting for more eggs.
P.S., There isn't much known about Amblydoras spawning, but mating has been observed a few times (although egg raising wasn't successful in any of the cases I'm aware of). Here's what I found as a forum search of past threads:
- Amblydoras spawn by @Doradid
- This thread has a link to a YouTube video showing spawning. The link is now dead, but I think there is a similar video here: Amblydoras spawning (I'm embedding the current video under this set of bullets). Does anyone know if this new video is from the same person?
- Breeding Doradids by @Divemaster
- No spawning was reported, but it's a great discussion of setup.
- Amblydoras nauticus species Tank by @Phyllonemus
- This post describes suspected spawning behavior, but no spawn confirmed.
- Phyllonemus has several Amblydoras YouTube videos too: https://www.youtube.com/@zappa0609/videos