I was thinking about this as I was cleaning jars today, and I wanted to put it on here in case anyone might find it helpful.
Eros and Aphrodite were first-time parents for this spawn. After some researching and decision-making on my part, I decided to use a father-in method for this spawn. After the fry became free swimming (~3 days old), I left Eros in the tank instead of removing him. He stayed with the babies until day 10, 1 week after the fry were free swimming. I probably could have left him in for longer, but I decided not to take my chances. I fed him during this time in hopes he didn’t gobble down all the fry, but even if he ate some, he hardly made a dent in the population.
I used this method in hopes of him “weeding out” the fry he suspected had deformities or other issues. It was my first time trying something like this, and while I can say it’s definitely risky if you don’t know your male (I didn’t, but wanted to try anyways), I have not had to cull a single fry. On top of that, I’ve only lost a handful of babies, and a couple of those were due to my own negligence during a water change one day (which I still feel terrible about 😢).
I don’t know if Eros ate any of the weaker fry while he was in the tank with them. All I know is that these babies are strong and healthy. They’ve tolerated temperature swings during power outages, daily 80% water changes, and more. Honestly, I think it would be naive to say none of this had to do with the fact that Eros was left with them for a while.
In spawns I’ve had in the past (where I removed the father after the fry were free swimming), the male became noticeably depressed, lethargic, and in some cases even died. I always condition my breeder fish for at least 2 weeks and make sure they’re able to physically handle breeding, but it didn’t seem to make a difference with those fathers. This was not nearly the case with Eros. After I removed him, his behavior didn’t change at all. He’s been his happy, normal self since spawning. Whether or not this was because he got to stay with his fry longer, I can’t say for sure. Maybe his personality was just better equipped for breeding than males I’ve had in the past, who knows? But I think it’s at least worth mentioning.
Now, I can’t say any of this is for sure because I simply don’t know (and frankly, I’m not sure there even is a way of knowing). I do know, however, that I have ~450 babies that are all healthy and beautiful. On top of all of this, both were first time parents; I didn’t expect to get nearly this many fry (though I knew it was possible), and they made perfect babies.
So anyways, I’m like, SUPER in love with these guys if you couldn’t tell, lol. I just wanted to share this in case anyone was thinking of breeding and using the father-in method.
If anyone has had experiences or read things about this and would like to add to or comment on what I’ve said, please feel free! I’d love to hear some different perspectives and/or opinions!
Thanks for reading 😁