Publication Date:
2021-05-19
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.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Carasius auratus
;
Growth
;
Survival
;
Carotenoid pigments
;
Artemia urmiana
;
Phallocryptus spinosa
;
Concentrate
;
Fish
;
Goldfish
;
Survival rate
;
Feeding
;
Diet
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
48pp.
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