頁籤選單縮合
題名 | Evidence of a Spawning Area of Anguilla marmorata in the North Equatorial Current of the Western North Pacific |
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作 者 | Miller,Michael J.; Tsukamoto,Katsumi; | 書刊名 | 水產研究 |
卷期 | 9:1/2 民90.12 |
頁次 | 頁191-198 |
分類號 | 388.491 |
關鍵詞 | Anguilla marmorata; Leptocephali; Spawning area; North equatorial current; |
語文 | 英文(English) |
英文摘要 | Leptocephali that appear to be predominantly Anguilla marmorata have been consistently collected in the same area of the North Equatorial Current (NEC) in the western North Pacific during three consecutive cruises in June and July of 1991 (N = 28), 1994 (N = 20), and 1995 (N = 27). These A. marmorata type leptocephali were collected between 131°E to 142°E and 13°N and 20°N, to the west of the Mariana Islands, in 20 tows in 1991, in 14 tows in 1994 and in 17 tows in 1995, indicating a widespread presence, but a relatively low abundance. Six of these specimens (16.3-36.0 mm TL) from the 1995 cruise, which were of the typical size range of these leptocephali, have been genetically confirmed as the longfin species A. marmorata by Aoyama et al.(1) The consistent presence of recently spawned A. marmorata type leptocephali (9-20 mm) in all three years suggests that the western region of the NEC is the spawning area of the northern population of A. marmorata that has been identified genetically by Ishikawa(2). These leptocephali would then be transported westward by the NEC and could either be transported north into the Kuroshio Current and toward Taiwan and Japan, or south toward the southern Philippines and into the Celebes Sea by the Mindanao Current. The presence of other genetically distinct populations of A. marmorata(2), the presence of A. marmorata leptocephali in the equatorial region to the southeast and in the western South Pacific(1), and the patterns of surface circulation in the western Pacific, indicate that unlike temperate anguillid species, this species appears to have multiple spawning areas. |
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