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

Kuroki, Mari and Miller, Michael J. and Feunteun, Eric and Sasal, Pierre and Pikering, Timothy and Han, Yu-San and Faliex, Elisabeth and Acou, Anthony and Dessier, Aurélie and Schabetsberger, Robert and Watanabe, Shun and Kawakamia, Tatsuya and Onda, Hiroaki and Higuchi, Takatoshi and Takeuchi, Aya and Shimizu, Madoka and Hewavitharane, Chinthaka A. and Hagihara, Seishi and Taka, Terumasa and Kimura, Shingo and Mochioka, Noritaka and Otake, Tsuguo and Tsukamoto, Katsumi (2020) Distribution of anguillid leptocephali and possible spawning areas in the South Pacific Ocean. Progress in Oceanography, 180 . NA. ISSN 0079-6611

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    Abstract

    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.

    Item Type: Journal Article
    Subjects: Q Science > QP Physiology
    S Agriculture > SH Aquaculture. Fisheries. Angling
    Divisions: School of Agriculture, Geography, Environment, Ocean and Natural Sciences (SAGEONS)
    Depositing User: Chinthaka Hewavitharane
    Date Deposited: 20 Sep 2021 15:05
    Last Modified: 20 Sep 2021 15:05
    URI: http://repository.usp.ac.fj/id/eprint/12983
    UNSPECIFIED

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