Table 1.

Major by-products are obtained from various seafoods.

Groups	Name of the Seafood	By-Products		References
		Body Parts	Percentage (w/w)
Mollusca	Octopus, squid, cuttlefish	Skin, heads, fins, tentacles, and guts	Up to 60	[17]
	Clam, oyster, scallop, mussel, etc.	Shells and viscera	60–80	[18]
Crustacean	Crayfish	Head and shell	Up to 80	[19,20]
	Shrimp	Head, shell, and tail	40–45	[14,15]
	Lobster	Heads, shells, livers, and eggs	50–70	[21]
	Crab	Viscera, shell	Up to 85	[22]
Finfish and other cartilaginous fishes		Trimming	2–5	[6,11,23]
		Skin	1–5
		Scales	2–4
		Bones	10–34
		Liver and gut	15–20
		Head	15–20