NDLI: Effect of salinity on occurrence of notochord deformities in Japanese eel Anguilla japonica larvae

Content Provider	Springer Nature Link
Author	Okamura, Akihiro Yamada, Yoshiaki Mikawa, Naomi Horie, riyuki Tsukamoto, Katsumi
Copyright Year	2015
Abstract	One of the difficulties to rear Anguilla japonica larvae is the frequent occurrence of notochord deformities. We tested the effect of salinity on the occurrence of the deformities, because we have been using 50 % diluted seawater (50 % SW) for glass eel production, on the basis of the fact that intermediate salinity saves energy due to lower cost for osmoregulation and contributes higher survival and growth rates. We reared 6-day-old larvae in 50 and 100 % SW for 85 days and observed their morphology. The occurrence rate of deformed larvae, including kyphosis and scoliosis, was significantly higher in 50 % SW (35.8 %) than in 100 % SW (25.4 %), while survival rate was significantly higher in 50 % SW (69.8 %) than in 100 % SW (32.3 %) and growth in 50 % SW (mean body depth: 7.9 ± 5.3 mm) was better than in 100 % SW (6.8 ± 4.6 mm). We speculate that the most of severely deformed larvae could not survive in the tougher condition of 100 % SW, showing the lower occurrence of deformed larvae. Eventually, the yield of normal larvae after 85 days rearing was 1.9-fold higher in 50 % SW than in 100 % SW, implying that the advantage of 50 % SW for rearing eel larvae outweighs the risk of deformities.
Starting Page	549
Ending Page	555
Page Count	7
File Format	PDF
ISSN	09676120
Journal	Aquaculture International
Volume Number	24
Issue Number	2
e-ISSN	1573143X
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-08-19
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Freshwater eel Leptocephalus Glass eel Deformity Salinity Artificial production Freshwater & Marine Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Agronomy and Crop Science

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