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Mostly Male Apsito Fry
- Thread starter MapleNeil
- Start date
Temperature, pH and TDS during brooding can influence this. There is likely no information for this strain.
"sp. viejita red" is a trade name, not a valid or independent species. They are a tankbred domestic form of Apistogramma macmasteri. So if you find anything, you will likely find it with that species name.
"sp. viejita red" is a trade name, not a valid or independent species. They are a tankbred domestic form of Apistogramma macmasteri. So if you find anything, you will likely find it with that species name.
I tried searching for "all male fry" but it returned every thread with "male" or "fry" in it. Am I doing something wrong with my search?
- Messages
- 2,770
- Location
- Wiltshire UK
Hi all,
There isn't much <"scientific data for sex ratio differentiation" in Apistogramma spp. but I'd expect A. macmasteri would be similar to fish that <"we do have values for">. Have a look at <"Does Temperature affect sex ratio"?>
This is a more recent Römer paper than the 1996 one previously referenced. Beninde et al. (2020) "Changes of water temperature caused by deforestation are of major concern for the future of many species of Apistogramma (Regan, 1913) (Teleostei, Perciformes, Cichlidae, Geophaginae)" Bulletin of Fish Biology 19 pp 1 - 25.
From personal experience, in both A. agassizii & A. cacatuoides about ~26 or 27 oC (78 - 80 oF) gives you 50 : 50 male : female fry, although I have had all male and all female broods without knowingly having changed the temperature.
The warmer the water is the more males you will get. You also tend to get better male fry survival if the fry are crowded etc. I assume this is because the male fry are usually a bit bigger than the females at the same age.
cheers Darrel
There isn't much <"scientific data for sex ratio differentiation" in Apistogramma spp. but I'd expect A. macmasteri would be similar to fish that <"we do have values for">. Have a look at <"Does Temperature affect sex ratio"?>
This is a more recent Römer paper than the 1996 one previously referenced. Beninde et al. (2020) "Changes of water temperature caused by deforestation are of major concern for the future of many species of Apistogramma (Regan, 1913) (Teleostei, Perciformes, Cichlidae, Geophaginae)" Bulletin of Fish Biology 19 pp 1 - 25.
From personal experience, in both A. agassizii & A. cacatuoides about ~26 or 27 oC (78 - 80 oF) gives you 50 : 50 male : female fry, although I have had all male and all female broods without knowingly having changed the temperature.
The warmer the water is the more males you will get. You also tend to get better male fry survival if the fry are crowded etc. I assume this is because the male fry are usually a bit bigger than the females at the same age.
cheers Darrel
