Reexamination of the spawning migration of Anguilla dieffenbachii in relation to water temperature and the lunar cycle

The oceanic spawning migration of female Anguilla dieffenbachii eels was previously studied using pop-up satellite transmitting tags (PSAT). The swimming depths and experienced-temperature data of 3 eels released in May 2006 were re-examined in relation to water temperature data, and also lunar cycl...

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Bibliographic Details
Published in:New Zealand journal of marine and freshwater research 2020-01, Vol.54 (1), p.131-147
Main Authors: Watanabe, Shun, Higuchi, Takatoshi, Noshiro, Masaharu, Manabe, Ryotaro, Miller, Michael J., Jellyman, Donald J., Tsukamoto, Katsumi
Format: Article
Language:English
Subjects:
Anguilla dieffenbachii
Catadromous fishes
diel vertical migration (DVM)
Eels
Hydrography
lunar cycle
Lunar rhythm
Marine fishes
migration
Moon
moon light
New Zealand longfin eel
Night
ocean temperature
pop-up satellite archival transmitting tag (PSAT)
Spawning
Spawning migrations
Swimming
Temperature data
Water temperature
Water temperature data
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Summary:The oceanic spawning migration of female Anguilla dieffenbachii eels was previously studied using pop-up satellite transmitting tags (PSAT). The swimming depths and experienced-temperature data of 3 eels released in May 2006 were re-examined in relation to water temperature data, and also lunar cycle and regional hydrography as these latter aspects were not considered in the original study. Eel 2 and Eel 3 initially experienced lower water temperature above 600 m, suggesting they remained south of the subtropical-convergence front longer than Eel 1. Their experienced nighttime minimum depths showed linear relationships with the lunar cycle, because they swam shallower during new moon than during full moon. The eels experienced narrow deep-day temperature ranges at a wide range of depths compared to experiencing narrow shallow-night depth ranges where temperatures varied more widely, indicating that several different factors determine their day and night depth ranges.
ISSN:0028-8330
1175-8805
DOI:10.1080/00288330.2019.1614075