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Golden Wonder Killifish Spawning
I recently bought two young golden wonder killies, Aplocheilus lineatus. Due to washed-out colors at the store the fish could not be sexed. However, I apparently lucked out and got a pair as the male has colored up nicely. The fish are pretty small, about 2.5" but today have been showing spawning behavior. Is this usual for fish this small? The fish are in a community tank and as I'm not trying to breed them (yet) it's no problem if my other fish eat the eggs or fry. I was hoping for a male/female pair as I've read that males can be aggressive. I'm prepared to separate the fish if I need to, but now it looks like I won't need to. Will it be ok if I leave the two together in the community tank?
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They should be just fine in the community aquarium personality wise, as long as you don't have any fish that are significantly smaller. However, they are technically subtropical and meant to be kept in slightly cooler waters (76F is ideal). It's possible that the higher temperatures in your tank have made them think it's spawning season, but I'm totally guessing as I know nothing about spawning these killis.
I keep the fish at about 78, which is at the high end of their listed range. I did a bit of research and found that the fish come from the same coastal areas of India as fish that are listed as needing tropical temps. I've also read that many killifish breeders keep their adult fish at slightly cooler temperatures for two reasons: 1) it slows their metabolism enough to help prolong the life of the fish (for more breeding) and 2) bumping the temp up to standard tropical range helps induce spawning. I've read that betta breeders do the exact same thing with their fish. I've also read similar stuff about guppies with some people keeping them in temps as low as the 60's. I think this might be part of the reason for the rumor that bettas do fine at cooler temperatures. So, the cooler temperature requirements for killifish makes sense given how much killi breeding goes on in captivity and I believe is probably reinforced by the generally short lifespans of killies. So, whether or not they do best in slightly cooler temperatures seems at least debatable.
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