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
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan.
College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan.
Prog Oceanogr. 2019 Nov 28;180. doi: 10.1016/j.pocean.2019.102234. eCollection 2020 Jan.
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 mor-phometric observations and DNA sequencing, 74 anguillid leptocephali were collected, which in the southern areas included 29 larvae of six species: , , , , , and (all anguillid species of the region were caught except ). Small (9.0-16.8 mm) and (12.4, 12.5 mm) leptocephali were collected south of the Solomon Islands, other (10.8-12.0 mm) larvae were caught northwest of Fiji along with an (20.0 mm) larva, and an (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.
七种南太平洋海鳗物种生活在从新几内亚到法属波利尼西亚的区域，但尽管此前进行过抽样调查，它们的产卵区域和生活史大多仍不为人知。2016年7月至10月进行了一次研究巡航，以研究南太平洋海鳗的产卵区域和时间以及幼体分布情况，其中包括在新几内亚东北方向155°E处设置的一条较短的测站线，以及五条穿过南赤道流（SEC）和其他洋流的长断面（南纬5 - 25°，东经160° - 西经140°）。此次调查使用伊萨克斯 - 基德中层拖网在179个测站收集了近4000个鳗形柳叶状幼体，并进行了104次温盐深测量。基于形态测量观察和DNA测序，收集到了74个海鳗柳叶状幼体，在南部区域包括六种海鳗的29个幼体：[此处原文缺失六种海鳗的具体名称]（该区域所有海鳗物种均被捕获，除了[此处原文缺失未捕获的海鳗物种名称]）。在所罗门群岛以南收集到了小型的[此处原文缺失一种海鳗幼体名称]（9.0 - 16.8毫米）和[此处原文缺失一种海鳗幼体名称]（12.4、12.5毫米）幼体，在斐济西北部捕获到了其他[此处原文缺失一种海鳗幼体名称]（10.8 - 12.0毫米）幼体以及一条[此处原文缺失一种海鳗幼体名称]（20.0毫米）幼体，在萨摩亚附近收集到了一条[此处原文缺失一种海鳗幼体名称]（7.8毫米）幼体。考虑到收集地点、通过耳石分析得出的幼体年龄以及南赤道流的向西漂移情况，在6月和7月期间，在存在高盐度亚热带水下层（STUW，深度约150米）和温暖、低盐度表层淡水池的区域，从所罗门群岛以南和斐济地区（16 - 20日龄幼体）到萨摩亚附近（19日龄幼体）出现了多个产卵地点。五个长水文断面显示西部有强烈的淡水池，东部是亚热带水下层形成区域。
