Distribution of anguillid leptocephali and possible spawning areas in the South Pacific Ocean
Distribution of anguillid leptocephali and possible spawning areas in the South Pacific Ocean
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DOI：
10.1016/j.pocean.2019.102234
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发表时间：
2020-01-01
影响因子：
4.1
通讯作者：
Tsukamoto, Katsumi
中科院分区：
文献类型：
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作者：
Kuroki, Mari;Miller, Michael J.;Tsukamoto, Katsumi
七种南太平洋鳗鳗生活在新几内亚到法属波利尼西亚，但尽管以前的抽样调查，它们的产卵区和生活史大多是未知的。2016年7月至10月进行了一次研究巡航，以研究南太平洋鳗鳗的产卵区域和时间以及幼虫分布，其中包括新几内亚东北部东经155度的短站线和穿越南赤道（SEC）和其他洋流的五个长断面（南纬5-25度，东经160 -140度）。本次调查收集了近4000 anguilliform leptocephali在179个站使用艾萨克-基德中层拖网伴随着104 CTD铸件。通过形态学观察和DNA序列测定，共采集到鳗类幼鱼74尾，其中南部海域的鳗类幼鱼29尾，分属于6个种：双色鳗鲡（Anguillabicolorpacifica）、太平洋鳗鲡（Anguillabicolorpacifica）、欧洲鳗鲡（Anguillabicolorpacifica）、欧洲鳗鲡（Anguillabicolorpacifica）和欧洲鳗鲡（Anguillabicolorpacifica）。marmorata、花斑拟步行虫A. australis、南方拟步行虫A. reinhardtii，A. megastoma和A. obscura（除A.花叶万年青）。小A。australis（9.0-16.8 mm）和A. reinhardtii（12.4，12.5mm）leptocephali，其它A. australis（10.8-12.0 mm）幼虫在斐济西北部沿着用A. obscura（20.0 mm）幼虫，以及A. marmorata（7.8 mm）幼虫。考虑到收集地点，幼虫年龄从耳石分析，并向西SEC漂移，多个产卵地点发生从南部的所罗门群岛和斐济地区（16-20天的老幼虫）萨摩亚附近（19天的老幼虫）在6月和7月在高盐度亚热带水下（STUW，类似于150米深）和温暖，低盐度的表面新鲜池。五个长的水文剖面显示，在西部的强大的新鲜池和STUW形成区在东部。
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 degrees E station-line northeast of New Guinea and five long transects (5-25 degrees S, 160 degrees E-140 degrees 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, similar to 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.