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Ecological Study on Clupeoid Larvae and Juveniles in the Shirasu Fishery Ground of Tosa Bay, Japan
http://hdl.handle.net/10126/4399
http://hdl.handle.net/10126/43996a2d35c8-b0f0-4858-a28f-c489ff217eef
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
marine24-059.pdf (721.5 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2010-03-17 | |||||
| タイトル | ||||||
| タイトル | Ecological Study on Clupeoid Larvae and Juveniles in the Shirasu Fishery Ground of Tosa Bay, Japan | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | Clupeoid larvae and juveniles | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | Shirasu | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題 | Tosa Bay | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 著者 |
Djumanto
× Djumanto |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The community of three clupeoid (Engraulis japonicus, Etrumeus teres and Sardinops melanostictus) larvae and juveniles were examined monthly in their fishery ground in central Tosa Bay, Japan between October 2001 and September 2002. A total of ca. 1.5 million clupeoid larvae and juveniles were collected at four depths (5, 10, 15 and 20 m) in areas off the Niyodo River mouth. E. japonicus occurred all year round, and was the most abundant (ca. 61% of total), followed by E. teres (ca. 25%) and S. melanostictus (ca. 7%). Dominant species changed seasonally, i.e. E. japonicus dominated from April to October with two peaks in April and August, E. teres, from November to February with a peak in February, and S. melanostictus, in March with a peak in February. Sizes were more widely distributed and larger for both E. teres (7-41 mm with two modes) and S. melanostictus (7-41 mm with two modes) than for E. japonicus (7-37 mm with two modes). Age determined by ring increments on otoliths (sagittae) showed multi-modal patterns in all species, i.e. modes were identified around 26-30 and 46-50 days for E. japonicus, 11-15 and 26-30 days in E. teres, and 16-20 and 51-55 days in S. melanostictus. According to relationships between monthly changes in the modes of size, age and hatching date, migrant and resident stocks were present, and all three species tended to be longer residents in the fishery ground during winter. Hatching dates, estimated by daily ring increment of otoliths were distributed all year round in E. japonicus, October to March and May to July in E. teres and October to March in S. melanostictus. Furthermore, from larva net collections made offshore in the bay from April 2002 to March 2003, eggs hardly or never occurred from July to February for E. japonicus, from April to October for E. teres and from April to December for S. melanostictus. Considering these facts with information by other institute, larvae of E. japonicus, E. teres and S. melanostictus which occur in November to January would not be born in Tosa Bay. Since their early larvae were collected with a larva net during the autumn, they must be transported after hatching from outside Tosa Bay. Hence, each larva assemblage of three clupeoid seems to originate from plural spawning stocks. | |||||
| 書誌情報 |
Bulletin of marine sciences and fisheries, Kochi University 巻 24, p. 59-69, 発行日 2006-03-31 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 03879763 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA10778872 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版者 | ||||||
| 出版者 | 高知大学海洋生物教育研究センター | |||||
| 言語 | ja | |||||
