blackskirt tetra mating and temperature - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 11-28-2009, 10:01 AM Thread Starter
blackskirt tetra mating and temperature

Hi all,

I recently bumped my aquarium temp from about 77' to 79' and out of nowhere my tetras started getting pregnant. At any given time one would be just pregnant (you can just see the swollen belly) and another would be full-blown-about-to-lay-eggs pregnant. I turned the temp down two days ago and haven't seen a pregnant one yet. I'm wondering about the correlation there. Does temperature matter?

And as barbaric as it sounds, I'm sure all of the fish were happy to have some extra food that week.

And it was also nice to see who is male and female and look at behavior patterns of the genders.


Stephanie's updated tank profiles:
29 gallon 10 gallon
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post #2 of 2 Old 11-28-2009, 12:44 PM
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With most characins and corydoras, lowering the temperature (in combination with a partial water change) usually triggers spawning, providing the fish are "ready." This simulates a rainstorm in their natural habitat, and they spawn at the start of the rainy season when the rivers flood the surrounding forest and food is more plentiful. Do a major pwc with slightly cooler water (1-2 degrees) on a day with a low pressure system and it's almost a certainty.

They will spawn when ready of course, regardless; could have been just the right time. I have about 100 various characins in my 115g and it seems one species or other is spwaning regularly. Great to watch, "natura naturans" or nature naturing.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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