Protein hydrolysates can be produced from various sources (e.g., whey, soy, and fish) using a variety of methods, including heating with acids or by enzymatic treatment with either endogenous or exogenous proteolytic enzymes (Clemente, 2000). Protein hydrolysates from fish sources in particular have attracted much research attention since the raw materials used, which are often byproducts
from fish processing, are readily available, and the resulting preparations have high protein content with good amino acid balance (Chalamaiah et al., 2012). Additionally, fish protein hydrolysates have been reported to contain bioactive peptides with a
wide variety of biological activities, such as immunomodulatory,