If their bodies (not counting fins) are a silver dollar in size, then they are plenty large enough to spawn. I believe they can start around 1 year of age. And there is really no correlation between size and age. Size depends mostly on the environment they grew up in.
Make no mistake, this is no quick and easy way to make cash. Full broods can be tough to get and tough to keep alive. not to mention the amount of baby brine shrimp that 100 - 200 (not to mention full grown fish can produce 500+ eggs) fry can go through is astronomical. And the work to keep shrimp hatching at that intake rate is taxing.
If you plan on raising 200 fish per month, and it takes about 3 months to get a saleable size, you will be stocking 600 angelfish. That's a lot of tanks, food, and maintenance. I've tried it, I don't have the schedule to keep up with it, nor do i have a productive enough breeding pair (40-50 healthy fry per brood doesn't pay for itself).
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