Publication Date:
2021-07-16
Description:
The diet quality and type has a great role in aquatic animals and leads to increase of resistance against diseases and good growth. Cultured andornamental fish do not access to live and selected food due to captivity condition. Threfore, they should be provided with complete diet similar to natural food in captive condition. Carotenoid pigments are responsible of flesh pigmentation of edible fish and skin color of ornamental fish. The accumulation of this pigments in fish tissue has a greate importance in marketing and hence due to lack of its synthesis, carotenoids shoud be added to diet of cultured fish. As the synthetic carotenoids are harmful to the environment , there is a greate interest to use natural carotenoids in ornamental fish diets to obtain bright color. This study was carried out to compare the effects of diets containing Artemia urmiana and Phallocryptus spinosa supplements and commercial feed on growth and survival of goldfish fingerlings, quality of skin color, amounts of total carotenoids, Astaxantin, Canthaxantin and beta-carotene inCultured Carassius auratus during 90 days. The culture medium were contained glass aquaria in controlled condition and suitable for goldfish growth with 12 L: 12 D photoperiod and water temperature of 28±1 oC 3 test groups were included: treatment 1 fed with concentrate diet , treatment 2 fed with concentrate and frizzed Phallocryptus spinosa with tha same concentrations and treatment 3 fed with concentrate and frizzed Artemia urmiana with the same concentrations . Each treatment contains 2 replications and each replication consisted of 30 goldfish. In this study, The amounts of total carotenoids using spectrophotometer modelWPA, astaxantin, canthaxantin and beta-carotene using HPLC model Younglin, UK, were determined in the skin of Carassius auratus at the end of the exprement period. The results revealed that the most growth rate (GR), specific growth rate and condition factor (CF) were 0.11 ±0.006, 0.34 ± 0.015 and 3.96 ± 0.10, respectively which due to treatment 3 and the most weight gain and length gain including 8.57± 1.18g and 31.54± 3.33 mm, respectively due to treatment 2 .During rearing period, there was not any significant difference among treatments (p〉0.05). The analysis of obtained data showed that there was a significant difference between diets containing live food and concentrate diet (p〈0.05). The results revealed that live food enhanced skin color of Carassius auratus compared to concentrate diet. Also, the most pigmentation obtained from the diet contained fairy shrimp. As, in concentrate, concentrate and fairy shrimps, concentrate and Artemia diets amounts of total carotenoids at 450 nm wave length were 1.09, 3.90 and 2.07 mg/100, asthaxantin were 84.57, 205.82 and 102.24 ng/g and canthaxanthin were 0.24, 35.79 and 30.64 ng/g and carotenoid were 34.73, 138.78 and 69.77 ng/g, respectively. The use of fairy shrimp compared to Artemia in the diet can be significantly increased the amounts of carotenoids especially asthaxanthin in the skin of goldfish (p〈0.05). Therefore fairy shrimps can be used as a suitable for artemia and high cost synthetic pigments to enhance color of ornamental fish.
Keywords:
Aquaculture
;
Iran
;
Carasius auratus
;
Growth
;
Survival
;
Carotenoid pigments
;
Artemia urmiana
;
Phallocryptus spinosa
;
Concentrate
;
Fish
;
Goldfish
;
Survival rate
;
Feeding
;
Diet
Repository Name:
AquaDocs
Type:
monograph
Format:
application/pdf
Format:
application/pdf
Format:
48
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