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油谷湾における若齢期マダイの成長
https://fra.repo.nii.ac.jp/records/2008248
https://fra.repo.nii.ac.jp/records/200824883f1ae34-f7ff-4f66-9d42-5e813f83e322
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-06-20 | |||||
| タイトル | ||||||
| タイトル | 油谷湾における若齢期マダイの成長 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Growth of the Red Sea Bream (Pagrus major) in Young Stages in Yuya Bay, the Japan Sea | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 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 | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
小島, 喜久雄
× 小島, 喜久雄 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Growth of the red sea bream (Pagrus major) in young stages was studied in Yuya Bay, facing the Japan Sea. The materials were caught by small beam trawl during the period from 1975 through 1980. The result of the study was summarized as follows: 1) The fish moved into the bay as larvae from late April to late June, showing its peak sometime in May. After staying about one half year, the fish migrated out of the bay in September through October as young fish. There were more than two modes in the length compositions of the fish each year, indicating that there had been fluxes in the inward migration of the fish although it had been continuous as a whole. And each mode was considered to represent a peak in the inward migration respectively. The length composition was different year to year reflecting that the mode of inward migration to be different yearly. 2) It was observed that the growth rate was different among the years, showing the difference of 0.3mm in daily growth between the year of the best growth and the worst. In general, the fish to come earlier grew faster than the fish to come later during the season. 3) The mean length of the fish was different between habitats within the bay. In general, the fishes were larger in shallower waters and in the areas of rich vegitation of Zostera bed. This was considered that the larger fish which had come earlier occupied the better habitats first. 4) Within respective habitat, there seemed to be hierarchy between the group of larger fish and the group of smaller fish. In many cases, the larger fish dominated in number over smaller fish and grew faster than the latter. 5) Although slight negative corelations were observed between the density of distribution and growth rate of the fish within a habitat, the relation was weak enough to suggest that the influence of the density of the distribution on the growth was not critical. It was suggested that overpopulation was avoided by moving of some portion of fish out of the habitat, resulting in the regulation of the density, although the mechanism was not yet fully understood. | |||||
| 言語 | en | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 油谷湾に来遊する若齢期マダイの成長についての考察を行った.1. 幼稚魚期の全長頻度分布型は年によって変化するが,その変化はマダイ稚仔の湾内への来遊様式のちがいによるものと考えられる.2. 年級間の成長度には差がみられ,また早期来遊群の成長が後期来遊群より一般に良好である.3. 棲息密度と成長の間には負の相関がみられるがその程度は弱く,成長を著しく低下させないような水準に密度を維持する機構の存在が示唆される.4. 湾内のマダイの主な棲息域を5つの水域に区分して相互に平均全長を比較すると,水域間に差がみられる. 南岸3水域の全長頻度分布を対照すると,3水域に同一体長群が存在する場合とそうでない場合があり,平均全長の差はそれらの体長群の構成のちがいによって変化する.5. 水域間で体長群の構成に差を生ずる理由は,魚体が水深の浅い方に大きく,またアマモ場周辺ほど大きいという事実からみて,浅い水域の拡がりの程度と,アマモ場の発達という2つの要素に規定されるものと考えられる.6. さらにまた棲息密度の高いアマモ場周辺でも水深によって 全長頻度分布の モードに 明瞭な差がみられ,僅かな距離を隔てて大型群と小型群の間に生活環境をめぐって階層関係が存在する.同一定点内では一般に大型群が量的に多く,小型群が大型群を量的に凌駕することはない。また大型群の方が一般に成長が良い。 | |||||
| 言語 | ja | |||||
| bibliographic_information |
ja : 西海区水産研究所研究報告 en : Bulletin of the Seikai Regional Fisheries Research Laboratory 巻 56, p. 55-70, ページ数 16, 発行日 1981-03 |
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| 出版者 | ||||||
| 出版者 | 西海区水産研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | Seikai Regional Fisheries Research Laboratory | |||||
| 言語 | en | |||||
| item_10002_source_id_9 | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0582-415X | |||||
| item_10002_source_id_11 | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00393385 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | snf_k_56_55 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010232903 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
