The lsraeli Joumal of Aquaculture - Bamidgeh 49(4), 1997, 193-198
PIGMENTATION OF RAINBOW TROUT (ONCORHYNCHUS MYKISS)
WITH CAROTENOIDS FROM RED PEPPER
M. Yanar, M. Kumlu, M. Çelik, Y. Yanar and N. Tekelioglu
Faculty of Fisheries, University, Çukurova, 01330 Balcali, Adana, Türkyie.
Fax: 90 (322) 3386439
(Received 31.1.97, Accepted 14.11.97)
In this study, the effects of synthetic astaxanthin and red pepper on the pigmentation of rainbow trout Oncorhynchus mykiss were investigated. The fish (167 g) were fed three diets: Diet A (control diet with no addition of carotenoids), Diet B (75 mg/kg synthetic astaxanthin added) and Diet C(5% red pepper supplemented) for 20, 40 and 60 days.
Regardless of the experimental period the highest and lowest total carotenoid deposition in the fillet of the fish were found in fish fed Diet B (8.12 mg/kg) and Diet A (0.62 mg/kg), respectively
(p<0.05). The diet containing red pepper (Diet C) gave a significantly higher oarotenoid concentration (5.66 mg/kg) than the control but a lower level than the diel containing astaxanthin (p<0.05). However, the live weight gain of the groups did not differ significantly (p>0.05). Addition of 75 mg/kg astaxanthin (Diet B) increased the total cost of the feed by 15%, whereas addition of 5% red pepper (Diet C) to obtain 75 mg/kg of total carotenoid increased the cost by 14%.