In recent years there has been an increasing interest in finding and applications of substances from natural sources for use in food, cosmetics, and medicines. Sea products are valuable resources of natural substances such as lipids (n-3 fatty acids), polysaccharides, enzymes, vitamins, and proteins. Fish proteins have high contents in essential amino acids. Recent biotechnological progresses require the research of new bioactive peptides from natural resources that can be used as an alternative to chemical products in various applications (food, cosmetics, drugs, etc.). Many studies have shown that fish and other sea products, such as algae, are attractive sources of bioactive substances such as antioxidant, antitumoral, and anti-inflammatory compounds. Furthermore, a variety of fish hydrolytic enzymes (lipases, proteases, phospholipases, amylases, etc.) have been characterized and sometimes purified. Many of these enzymes display potentially interesting new biochemical properties for industrial applications.

The main focus of this issue is to highlight the potential of sea products as valuable resources of essential amino acids, bioactive peptides, and proteins as well as hydrolytic enzymes. These resources might be of great interest for industrial biotechnological processes using safe and natural materials such as peptides or enzymes. The special issue will be an opportunity for industrials to share their experience in using biotechnological molecules and to find the molecules and processes that meet their industrial interests. A special emphasis will be given to latest progresses made in the field of biotechnological processes used to upgrade proteins from sea products. Potential topics include, but are not limited to:

• Proteins and amino acids from marine resources
• Bioactive peptides from marine resources
• Purification and characterization of enzymes form sea products
• Biotechnical processes of biocatalysis using enzymes from sea products

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/jaa/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/ according to the following timetable: