This powdered methionine is of paramount importance among amino acids due to its limiting properties.
In addition to the amount of protein needed for fish, its composition is also an important consideration. In good quality bait, the ingredients should be selected to have a balanced amino acid set. Among many other amino acids, threonine, tryptophan, lysine, and methionine are of paramount importance because they affect the absorption of so-called limiting amino acids, i.e., other amino acids, and thus the protein synthesis of the body. Among the ingredients used by anglers, e.g., fish meal, shrimp meal, yeast, soybean meal, and most legumes have a high methionine content.
Liver powder, various small seeds, and coconut are outstanding in terms of lysine content.
Besides, it is worth mentioning the most important limiting amino acid, threonine. Egg powder is its excellent source.
The replacement is usually solved with a premix in intensive farming, a mineral-amino acid-vitamin mixture, according to the general recipe. However, we anglers use dozens of ingredients, so a universally applicable amino acid supplement cannot be suggested. Instead, it is advisable to adjust it to the chosen ingredients and ensure that lysine or methionine is added, taking into account the above.