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Feeding Habits of the Glass Eel Anguilla japonica Determined by C and N Stable Isotopes in the Nakdong River Estuary of the Korean Peninsula
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  • Journal title : The Sea
  • Volume 21, Issue 1,  2016, pp.36-43
  • Publisher : The Korean Society of Oceanography
  • DOI : 10.7850/jkso.2016.21.1.36
 Title & Authors
Feeding Habits of the Glass Eel Anguilla japonica Determined by C and N Stable Isotopes in the Nakdong River Estuary of the Korean Peninsula
KIM, JEONG BAE; LEE, WON-CHAN; KIM, HYUNG CHUL; HONG, SOKJIN; PARK, KYEONG DONG;
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 Abstract
Wild glass eels found in the Korean peninsula are thought to migrate along the North Equatorial Current and undergo the processes of spawning and incubation in the Mariana Trench. Juveniles of the wild glass eels are collected from the southern and western coasts of the Korean peninsula and used as seeds for aquaculture. To investigate the feeding behavior of wild glass eels, we collected glass eels from the Nakdong River estuary during March and April 2014 and analyzed the total length, wet weight, dry weight, carbon and nitrogen contents, and stable isotope ratio of eels as well as water temperature and salinity. Water temperature in the Nakdong River estuary was (mean 1SE; range, and salinity was (13.2~34.0), showed a lower range from 13.2 to 30.0 (a mean of 21.2) when the floodgates were opened. The total length of glass eels was (51.0~63.6) mm, wet weight was (33.6~133.2) mg, and dry weight was (10.1~29.1) mg. Carbon and nitrogen contents of glass eels were and , respectively. Mean and values of glass eels collected from the Nakdong River estuary were -20.9±0.2‰ and 6.1±0.1‰, displaying similar values to those of leptocephalus, glass eel larvae collected from the North Equatorial Current. Therefore, this result suggest that the glass eels collected from the Nakdong River estuary do not feed on prey after metamorphosis from eel larvae to glass eels their migration.
 Keywords
Glass eel;Anguilla japonica;Food web;Stable isotopes;Nakdong River estuary;
 Language
Korean
 Cited by
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