Habitat preference, movements and growth of giant mottled eels, Anguilla marmorata , in a small subtropical Amami-Oshima Island river

PeerJ
Hikaru Itakura, Ryoshiro Wakiya

Abstract

Although anguillid eel populations have decreased remarkably in recent decades, few detailed ecological studies have been conducted on tropical eels such as the giant mottled eel whose range extends across the whole Indo-Pacific. This species was studied throughout the entire 0.5 km mainstem reaches of Oganeku River on the subtropical Amami-Oshima Island of Japan over a two-year period using four sampling periods to understand its habitat preference, early life-stage dispersal process, movements, and annual growth using a mark-recapture experiment conducted with quantitative electrofishing. A total of 396 juvenile growth-phase A. marmorata eels were caught and tagged, with 48 individuals being recaptured at least once. Their density irrespective of size of eels was most strongly determined by distance from the river mouth, followed by riverbank type according to random forest models. Eel density decreased with increasing distance from the freshwater tidal limit located about 100-150 m from the river mouth. Eels preferred vegetated riverbanks, while they avoided those of concrete and sand. The density of small eels (total length: TL < 240 mm) was also associated with depth and velocity, with small eels tending to prefer riffle o...Continue Reading

References

Jun 5, 2008·Molecular Ecology·Yuki MinegishiKatsumi Tsukamoto
Jul 16, 2008·BMC Bioinformatics·Carolin StroblAchim Zeileis
Feb 3, 2011·Nature Communications·Katsumi TsukamotoHideki Tanaka
Aug 10, 2017·Scientific Reports·Takaomi Arai, Siti Raudah Abdul Kadir
Sep 13, 2017·The New Phytologist·Joana BergmannMatthias C Rillig
Apr 11, 2018·Journal of Fish Biology·S HagiharaK Tsukamoto
Jun 26, 2018·Journal of Fish Biology·Seishi HagiharaKatsumi Tsukamoto

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