*2.4. Carotenoids of the Chum Salmon O. keta*

The carotenoid content and composition of flesh of the chum salmon *O. keta*, collected in Monbetsu bay, are shown in Table 2. Acetylenic carotenoids, pectenolone and 7,8-didehydroastaxanthin, were found in *O. keta* as minor carotenoids, along with astaxanthin. 

**Table 2.** Carotenoids content and composition of flesh of the chum salmon *O. keta* collected in Monbetsu bay. 


\* Astaxanthin consisted of three optical isomers (3 *R*,3<sup>ȝ</sup>*R*),(3 *R*,3<sup>ȝ</sup>*S*), and (3*S*,3<sup>ȝ</sup>*S*) at the ratio of 82:2:16. 
