Scooter,
If you're interested in some historical trivia. . .Tropical (freshwater) fish foods were foods given to food fishes raised on aquaculture farms in the USA. In the early 1900's the food fishes were being fed remnants from meat packing houses. Then in the mid-1900's someone got an idea on how to make money.
In North America, the part of the cow we don't eat is the heart. From the meat packing houses, beef hearts were waste. It could be bought for about $0.05 per pound. The rest is marketing. It was a matter just to convince unknowing (and gullible) tropical fish owners that beef heart was the right food to feed their pets. A demand had to be created. The beef heart sold to tropical fish hobbyists for about $1.50 per pound, processed. This is the mid-1900's remember. Today you can buy flats of it for about $9./pound.
Everything went wrong when the meat packing houses figured out that their remnants were in demand. Not in demand from the tropical fish hobby, but up came Americans after WWII and their 2.2 children and a dog and cat. It all went to pet food manufacturers who paid a good price for the remnants. But what stuck was the demand for beef heart.
Still today, when beef heart is put into fish foods, manufacturers are riding on the old marketing that created the demand for it. It increases the protein content, but no one mentions that it contains proteins and fats that fish can't fully use.
If you're interested in some historical trivia. . .Tropical (freshwater) fish foods were foods given to food fishes raised on aquaculture farms in the USA. In the early 1900's the food fishes were being fed remnants from meat packing houses. Then in the mid-1900's someone got an idea on how to make money.
In North America, the part of the cow we don't eat is the heart. From the meat packing houses, beef hearts were waste. It could be bought for about $0.05 per pound. The rest is marketing. It was a matter just to convince unknowing (and gullible) tropical fish owners that beef heart was the right food to feed their pets. A demand had to be created. The beef heart sold to tropical fish hobbyists for about $1.50 per pound, processed. This is the mid-1900's remember. Today you can buy flats of it for about $9./pound.
Everything went wrong when the meat packing houses figured out that their remnants were in demand. Not in demand from the tropical fish hobby, but up came Americans after WWII and their 2.2 children and a dog and cat. It all went to pet food manufacturers who paid a good price for the remnants. But what stuck was the demand for beef heart.
Still today, when beef heart is put into fish foods, manufacturers are riding on the old marketing that created the demand for it. It increases the protein content, but no one mentions that it contains proteins and fats that fish can't fully use.