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Effect of ascidian (Halocynthia roretzi, Drasche 1884) tunics carotenoids on enhancing growth and muscle coloring of sea-reared rainbow trout (Oncorhynchus mykiss, Walbaum 1792)
- Source :
- Aquaculture Reports, Vol 4, Iss C, Pp 22-29 (2016)
- Publication Year :
- 2016
- Publisher :
- Elsevier, 2016.
-
Abstract
- A 120 days trial was conducted to investigate the effect of sea squirt (Halocynthia roretzi, Drasche 1884) tunic’s carotenoid to sea-reared rainbow trout (Oncorhynchus mykiss, Walbaum 1792) growth and muscle color. Sea-rearing was done at Tongyeong sea area, Korea. Three dietary treatments, namely control (C), CT, and AT, were administered to 6 groups of fish (n = 490-520). C was given basal diet which has contained 40 mg kg−1 of astaxanthin. A further inclusion of 10 mg kg−1 canthaxanthin was added to diet of CT, while AT’s feed was supplemented with 10 mg kg−1 H. roretzi tunics carotenoids extract. The result revealed that AT has the highest final weight (1119.2 ± 82.4 g) compare to those of C (881.0 ± 121.2 g) and CT (1068.2 ± 4.3 g). The specific growth rate (SGR) of AT (1.0 ± 0.07%/day) was significantly higher than C (0.7 ± 0.22%/day) and CT (0.7 ± 0.25%/day) while the feed conversion ratio (FCR) were 1.5 ± 0.6, 1.4 ± 0.6, and 1.2 ± 0.1 for C, CT and AT respectively. The hepatosomatic index (HSI) and Viscerosomatic index (VSI) of all groups showed no significant difference (p > 0.05). The muscle color was also positively affected by the treatments, CT and AT were significantly different from C (p
Details
- Language :
- English
- ISSN :
- 23525134
- Volume :
- 4
- Issue :
- C
- Database :
- Directory of Open Access Journals
- Journal :
- Aquaculture Reports
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.8ec0bc9039634f34b79a404db42adaaa
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.aqrep.2016.05.003