Raising minnows is easy too. If you own a farm or have a family friend that does then you are in luck. My family has a 1/4 acre cattle watering pond that stays around 3-4' during the summer. I poisoned it with rotenone to kill all the fish first. There were only perch in the pond and they were only 3-4" long . No real loss although they make great catfish and crappie bait. I fertilized the pond with several bags of fresh grass clippings. This happened to be done in August so it decayed quickly. In October I bought a gallon of rosy reds,about 1200 minnows, for around $65.00 and stocked the pond. Rosy reds are a color phase of the fathead minnow. They breed upside down on a surface. Yes, you read that right...upside down. I places several pallets in the pond stacked on top of each other and held in place with a T post pounded in the bottom. A spawning tower in a sense. I installed 2 towers. I also had some scrap 3" & 4" PVC pipe. I cut 15-20 pieces and each was about 8"-9" long. I threw that in for additional spawning structures. This idea came from the internet. I may add some additional ones this spring. The minnows start to spawn around 65 degs, so say April in Oklahoma. The rosies will spawn in April,May,June, July, August and possibly September. If you can stand to leave the pond alone for 1 year you will NEVER run out of minnows nor will your buddies. A fisheries biologist friend of mine told me that after 1 year the 1 gallon of rosies that was stocked will have developed into at least 5 gallons or 6,000 minnows. By end of year 2 maybe 30,000 adult rosies. I trap the minnows with a black vinyl coated minnow trap and a small handfull of dog or cat food. The vinyl coated trap does not bruise the minnows as bad as uncoated traps may. I toss the trap in the pond and after as little as 2 hours I have harvested 6 - 10 dozen adult minnows.
I hold the trapped minnows in a 300 gallon rubbermaid watering tank with aeration for as long as I need to,several weeks until they are all used up. I feed them goldfish food from Walmart and they readily come up and feed on it.
Finally I treat the tank with a 16 ounce cup of rock salt and some tetracycline (an antibiotic) approx 1/2 bag, available from feed store for $5.00 to kill all fungus and heal them up. This is not necessary if you use the bait within a week or so. I am just particular about having the best live bait I can have. Maybe that is why all my crappie buddies want my rosies.
Fatheads are tough tough minnows much tougher than shiners and can take a wide range of dissolved oxygen and still survive. My experience with rosies is that in clear water and stained/murky water the fish hit them 3:1 faster than regular minnows. That orange color sticks out like a hot burning ember on a black night. Ok,I am tired now. I hope I have helped someone. tight lines.:D