“…The hydrolysis process is a chemical reaction that modifies the functional properties of the feed and promotes the breakdown of proteins in amino acids and multiple-sized peptides with high protein value, which are easily absorbed by the animals (Mullen et al, 2017;Ronnestad, Kamisaka, Conceição, Morais, & Tonheim, 2007;Toldrá, Mora, & Reig, 2016;Wisuthiphaet, Kongruang, & Chamcheun, 2015). Therefore, it provides the break of long protein structures, resulting in nitrogen compounds of low molecular weight, which may act as food attractants, since these are detected by the gustatory tract of the fish (Broggi, Wosniak, Uczay, Pessati, & Fabregat, 2017;Halver & Hardy, 2002).…”