There are fresh ideas why fish meal should be considered again as an ingredient for modern piglet diets.
Feeds contained up to 10% fish meal as piglets often refused feed with more than 1% fish oil; and most fish meals contained about 10% fish oil, so the math gives 1% oil more or less. With increasing piglet weight, fish meal inclusion was reduced, but even in the later stages of the nursery period, some high-quality feeds contained 2.5% fish meal. A typical three-phase nursery program, thus, might contain 10%, 7.5%, and 2.5% fish meal; the numbers picked in a way to accommodate the typical weight of a bag of fish meal, 25 kg. But, back then, good quality fish meal was about US$500-600 per ton as the price jumped first to US$1,000 and even ended up, less than 10 years ago, to exceed US$2,000 per ton. Prices today for high-quality fish meal are about US$1,500 per ton, which are still too high.