Distribution of anguillid leptocephali and possible spawning areas in the South Pacific Ocean

•The spawning areas anguillid eel species in the South Pacific are mostly unknown.•An extensive 2016 net sampling/CTD survey was conducted including five long transects.•Small larvae of three species were collected at similar latitudes of the SEC in the west.•Spawning appeared to occur at three hydr...

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Bibliographic Details
Published in:Progress in oceanography 2020-01, Vol.180, p.102234, Article 102234
Main Authors: Kuroki, Mari, Miller, Michael J., Feunteun, Eric, Sasal, Pierre, Pikering, Timothy, Han, Yu-San, Faliex, Elisabeth, Acou, Anthony, Dessier, Aurélie, Schabetsberger, Robert, Watanabe, Shun, Kawakami, Tatsuya, Onda, Hiroaki, Higuchi, Takatoshi, Takeuchi, Aya, Shimizu, Madoka, Hewavitharane, Chinthaka A., Hagihara, Seishi, Taka, Terumasa, Kimura, Shingo, Mochioka, Noritaka, Otake, Tsuguo, Tsukamoto, Katsumi
Format: Article
Language:English
Subjects:
Animal biology
Biodiversity and Ecology
Early life history
Environmental Sciences
Freshwater eels
Life Sciences
migration
Otolith
South Pacific
Spawning
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Summary:•The spawning areas anguillid eel species in the South Pacific are mostly unknown.•An extensive 2016 net sampling/CTD survey was conducted including five long transects.•Small larvae of three species were collected at similar latitudes of the SEC in the west.•Spawning appeared to occur at three hydrographically similar locations.•Multiple spawning locations would facilitate recruitment to the numerous island areas. Seven South Pacific anguillid eel species live from New Guinea to French Polynesia, but their spawning areas and life histories are mostly unknown despite previous sampling surveys. A July–October 2016 research cruise was conducted to study the spawning areas and times, and larval distributions of South Pacific anguillid eels, which included a short 155°E station-line northeast of New Guinea and five long transects (5–25°S, 160°E–140°W) crossing the South Equatorial (SEC) and other currents. This survey collected nearly 4000 anguilliform leptocephali at 179 stations using an Isaacs-Kidd Midwater Trawl accompanied by 104 CTD casts. Based on morphometric observations and DNA sequencing, 74 anguillid leptocephali were collected, which in the southern areas included 29 larvae of six species: Anguilla bicolor pacifica, A. marmorata, A. australis, A. reinhardtii, A. megastoma,and A. obscura (all anguillid species of the region were caught except A. dieffenbachii). Small A. australis (9.0–16.8 mm) and A. reinhardtii (12.4, 12.5 mm) leptocephali were collected south of the Solomon Islands, other A. australis (10.8–12.0 mm) larvae were caught northwest of Fiji along with an A. obscura (20.0 mm) larva, and an A. marmorata (7.8 mm) larva was collected near Samoa. Considering collection sites, larval ages from otolith analysis, and westward SEC drift, multiple spawning locations occurred from south of the Solomon Islands and the Fiji area (16–20 days old larvae) to near Samoa (19 days old larva) during June and July in areas where high-salinity Subtropical Underwater (STUW, ~150 m depth) and the warm, low-salinity surface Fresh Pool were present. Five long hydrographic sections showed the strong Fresh Pool in the west and the STUW formation area in the east.
ISSN:0079-6611
1873-4472
DOI:10.1016/j.pocean.2019.102234