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Growth, metamorphosis and survival of orange-spotted rabbitfish (Siganus guttatus) larvae fed sodium iodide-supplemented brine shrimp (Artemia sp.)

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Date
2021-04
Author
Legaspi, Ma. Irene
Traifalgar, Rex Ferdinand M.
de Jesus-Ayson, Evelyn Grace T.
Andrino-Felarca, Karen Grace S.
Mamauag, Roger Edward ORCID
Page views
4,567
Subject
metamorphosis ASFA
growth ASFA
survival ASFA
brines ASFA
emulsions ASFA
brine shrimp culture ASFA
aquaculture ASFA
feeding experiments ASFA
sampling ASFA
iodides ASFA
thyroid gland ASFA
muscles ASFA
Artemia AGROVOC
Siganus AGROVOC
Sodium iodide
thyroid hormones AGROVOC
Siganus guttatus AGROVOC
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Abstract
In an attempt to improve the hatchery production of orange-spotted rabbitfish (Siganus guttatus), the present study evaluated the effects of iodine-supplementation of larval food (Artemia) on endogenous thyroid hormone (TH) levels in larvae, and subsequently on their metamorphosis, growth and survival. Rabbitfish larvae (20 days after hatching, DAH) were fed unsupplemented (control) and sodium iodide (0.8 g L−1) -supplemented Artemia. The larvae were reared in 250-L fiberglass tanks at a stocking density of five larvae L−1. Each treatment has three replicates. The study was conducted until 50% of the larval population in both treatments has completely metamorphosed. Iodine-supplementation in larval food resulted in significantly higher levels of thyroxine (T4) and triiodothyronine (T3), (TH) in rabbitfish larvae (p < 0.05). Treated rabbitfish larvae had significantly higher mean body weight (0.20 ± 0.01 g) than the control (0.14 ± 0.01 g) and a lower muscle fiber (MF) count (0.003 ± 0.001 MF μm−2) than the control (0.009 ± 0.002 MF um−2) (p < 0.05). However, survival was not different between the two treatments. Furthermore, using the statistical tool probit analysis on the metamorphic period index, it showed that 50% of the population in the control group metamorphosed at 42.4 DAH while 50% of the population in the treated group metamorphosed at 31.2 DAH. Cumulative stress index test indicated a positive response of larvae fed supplemented Artemia (p < 0.05). This study demonstrated that feeding sodium iodide-supplemented Artemia to rabbitfish larvae enhances the endogenous TH levels which in turn accelerates the metamorphosis and improves fish muscle fiber growth and stress tolerance.
Description
Supplementary data to this article can be found online at https://doi.org/10.1016/j.aquaculture.2021.736443.
URI
http://hdl.handle.net/10862/6031
Suggested Citation
Legaspi, M. I., Traifalgar, R. F. M., de Jesus-Ayson, E. G. T., Andrino-Felarca, K. G. S., & Mamauag, R. E. (2021). Growth, metamorphosis and survival of orange-spotted rabbitfish (Siganus guttatus) larvae fed sodium iodide-supplemented brine shrimp (Artemia sp.). Aquaculture, 536, 736443. https://doi.org/10.1016/j.aquaculture.2021.736443 
DOI
10.1016/j.aquaculture.2021.736443
Type
Article
ISSN
0044-8486
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