Table 2: Degree of hydroxylation.

Fish%

Squid47.8
Carp43.3
Eel40.2
Common mackerel41.1
Saury40.5
Chum salmon38.0
Tilapia43.0
Tiger puffer34.5
Dusky spinefoot37.6
Sea chubs40.4
Eagle ray41.6
Red stingray46.9
Yantai stingray40.6

Control (bovine)45.3