NDLI: Hyposmoregulatory ability and ion- and water-regulatory mechanisms during the leptocephalus stages of Japanese eel Anguilla japonica

Content Provider	Springer Nature Link
Author	Lee, Kyung Mi Yamada, Yoshiaki Okamura, Akihiro Tsukamoto, Katsumi Kaneko, Toyoji
Copyright Year	2012
Abstract	We explored osmoregulatory ability and mechanisms of ion and water regulation in Japanese eel leptocephali. Tissue osmolality of leptocephali ranged from 360 to 540 mOsm/kg·H$_{2}$O. Immunocytochemical observations revealed that Na$^{+}$/K$^{+}$-ATPase-immunoreactive mitochondrion-rich (MR) cells were distributed over the entire body surface of leptocephali. Using a fluorescent sodium indicator and the chloride test, we localized Na$^{+}$ and Cl$^{−}$ secreting sites at the apical region of cutaneous MR cells. To further examine drinking behavior and water absorption in the intestine, leptocephali were exposed to seawater containing dextran labeled with Alexa Fluor. To calculate relative water absorption, fluorescent intensity was measured along the digestive tract. Whereas water was hardly absorbed in the stomach and intestine, water absorption predominantly took place in the rectum. Our findings indicate that Japanese eel exert hyposmoregulatory ability as early as during leptocephalus stages, secreting Na$^{+}$ and Cl$^{−}$ through cutaneous MR cells and primarily absorbing water from ingested seawater in the rectum.
Starting Page	77
Ending Page	86
Page Count	10
File Format	PDF
ISSN	09199268
Journal	Fisheries Science
Volume Number	79
Issue Number	1
e-ISSN	14442906
Language	English
Publisher	Springer Japan
Publisher Date	2012-11-24
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drinking Japanese eel Leptocephalus Mitochondrion-rich cell Osmoregulation Rectum Water absorption Fish & Wildlife Biology & Management Freshwater & Marine Ecology Food Science
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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