Thanks for the info leeman. I currently have 3 baby bowfin in a 55 gal grow out and they're 2" at most and not aggressive yet. Do u have any idea on what size they will have to be separated? Also any other info on keeping them would be great it's my first run with bowfin.
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This extremely young size is horrific for potential cannibalism. The most important thing is to maintain the nearly equal size of your three baby Bowfins. If any of the three start "outgrowing" the other two, or if one starts lagging behind in growth it is imperative to separate before the smaller becomes food. I would use a 2/3 body size as a minimum to keep your juvenile bowfins together. Anything less than 66% of another young Bowfin is very risky.
In my experience the young female Bowfins seem to have far more co-specific aggression than do the young male Bowfins. They have certainly been more murderous for me. It is extremely easy to sex Amia Calva. The males have a clear ocel spot on their tail, females do not.
I'll give you a general feel for just how solitary this species is. I released two male bowfins in the 18 inch range into my spring fed farm pond. One Bowfin has claimed his home by the dock around the cattail growth, while the other has claimed a large cattail patch by the spring feed. These are roughly 70 feet apart, and the entire pond is only just over 100' in diameter. (This, and keep in mind that I have found the male Bowfin far more tolerable of other Bowfin than the Females!)
They still will not go near one another, but neither have any challenge with extreme close proximity hanging out with the two LMB, 24+ " LNG, or any of the 1' - 20" Florida gar in the pond!
Be very careful keeping the juvenile female Bowfin(s) with another Bowfin until at least 12". (This will come much sooner than you may think!)
Feeding Bowfins is sometimes tricky. They tend to be finicky eaters until they have developed a taste for some type of food. I have had limited success with Bowfin taking pellet food, and I do not use pellets as their staple diet. One food that is readily accepted consistently by every Bowfin that I have kept is Tillapia fillet.
Baby Bowfin are also notorious for having internal parasites. I had just about every young Bowfin that I kept had white stringy poop at first. I found it extremely easy to "cure" all but one (that died).
A quarantine of all live feeder fish should be maintained. Young Bowfin are not quite a well defensed against external parasites as my gars seem to be. Feeding minnows massively gut stuffed with NLS Thera + garlic 1mm pellets helps to seriously reduce the internal parasite count, and allow the young Bowfins body to do the rest of the work.
To date, I have never used any type of medication on any "ancient" fish species. I would highly advise against the use of medicine with Gars/ Bowfins, unless one of the experts on this forum specifically advise you to do so.