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養殖マダイ産出卵の移送機構に関する研究 (3)
https://fra.repo.nii.ac.jp/records/2008239
https://fra.repo.nii.ac.jp/records/20082393d2eca1e-e7b3-40b9-a056-659c360baa5c
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||||||
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| 公開日 | 2024-06-20 | |||||||||||||||||
| タイトル | ||||||||||||||||||
| タイトル | 養殖マダイ産出卵の移送機構に関する研究 (3) | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| タイトル | ||||||||||||||||||
| タイトル | Research on Transportation and Distribution of Eggs of Cultured Red Sea Bream (3) | |||||||||||||||||
| 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 | |||||||||||||||||
| その他（別言語等）のタイトル | ||||||||||||||||||
| その他のタイトル | 卵・仔魚期の移送拡散について | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| その他（別言語等）のタイトル | ||||||||||||||||||
| その他のタイトル | Transportation and Diffusion of Eggs and Larvae Relation to Current Pattern | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 著者 |
有薗, 真琴
× 有薗, 真琴
× 松浦, 秀喜
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| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | The authors had investigated the influence of the spawning of pen-cultured red sea bream, Pagrus major, to the wild populations in Senzaki Bay, Yamaguchi Prefecture, from 1975 to 1977. In the previous papers, the spontaneous spawning, and the egg and larval distribution were reported. In the present paper, we describe the transportation and diffusion of eggs and larvae with the flow pattern of the bay, and estimate the amount of eggs and larvae added to the wild populations from the pen throughout one spawning season. 1) The sea water flow pattern of Senzaki Bay varied widely from the surface layer to subsurface layers. In the surface layer the drift current was usually dominant, while in the subsurface and deeper layers the tidal current was prevailing. The surface current speed was closely related to the wind, and was nearly 3 to 5 per cent of the wind speed. In the middle and deeper layers, the current speed measured 2 to 3 cm/sec in the inner part of the bay, and 4 to 5 cm/sec in the central and mouth parts. 2) Following a patch of eggs dyed in the laboratory and released to the sea, the egg transportation appeared to be mainly controlled by the current, and the diffusion to be influenced by the shear effect. The egg density at the center of the patch decreased with diffusion according to the time elapsed. That can be approximated with the following equation: S(t)=S(0) ͭ ⁻ ᵏ where S(0) and S(t) denote the density of the eggs (no./m³) at the time 0 and t hours after the release, and k is the constant, which is calculated as 2.9 in average. The egg densities obtained in the sea varied widely from one release experiment to another. These variations could be explained by the multiple factors affecting the shear in such a closed environment as Senzaki Bay. 3) The egg density (no./m³) decreased with the distance from the cultured pen. The correlation between them is sufficiently approximated by the following equation: S(x) =S(0) exp (-DX) where S(0) and S(x) denote the density of the eggs at the distance of 0 and x meters from the pen, and D is the decreasing coefficient. Usually, the egg patches were found to be transported outward through the surface layer at a speed of 2 to 7 cm/ sec. The decreasing coefficient determining the egg distribution were in the order of 10⁻³/m. 4) The total number of eggs spawned in the cultured pen during one season was approximately estimated as 3 ×10¹⁰. In Senzaki Bay, based on the density ratio between newly spawned eggs and one-day eggs, it was estimated that in the period of 24 hours 45 per cent of the eggs remain within the bay, and the remainder flow out or die. The eggs of red sea bream hatch out approximately two days after spawning. Therefore, the proportion of the eggs that hatch out within the bay was calculated at about 14 per cent. This implies that about 4.3 × 10⁹ newly hatched larvae are added into the bay from the cultured pen during one spawning season. | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | 養殖マダイの自然産出卵の移送機構を明らかにするため,1975年から3ヶ年養殖場を中心として仙崎湾および深川湾で親魚の産卵実態と卵仔稚魚の分布を調査した.本報では染色卵および養殖場産出卵の移送拡散様式について海水流動に基づく解析を試み,1シーズン中に養殖親魚から自然資源に添加される量を試算した.1. 仙崎湾における海水流動は表層と中層以深ではそのパターンが異なり,前者では吹送流の卓越する場合が多いが,後者では潮汐流の卓越することが分かった.また,その流速については表層で風速の3~5%を示し,中層以深では湾奥部で2~3cm/sec,湾央～湾口部で4~5cm/secと推定された.2. 染色卵放流によってマダイ卵の移送拡散様式を実証した結果,その移送には吹送流が大きく関与し,拡散にはシア効果がみられるようであった.なお,その拡散過程における卵パッチの中心濃度の時間的変化は次式によく近似され,定数kは平均値で2.9を示したが,実験間の差異が大きいことから,内湾域においてシアを与える要因は一様でないと考えられた.S (t) = S (0) ͭ ⁻ ᵏ S(0) ; 放流時の卵密度(粒/m³) S(t) ; t時間後のパッチの中心密度(粒/m³) K ; 定数3. 養殖場産出卵の移送拡散について解析したところ,卵の分布密度は養殖場からの距離と高い相関を示し,次式によく近似されることが明らかとなった.なお,産出された各卵パッチは湾奥部において通常2~7cm/sec の速度で表層を湾口に向けて移送され,その分布を決定する密度変化係数 Dは10⁻³のオーダーであることが明らかとなった.S (x)=S (0) exp (-DX) S(0) ; 養殖場内卵密度(粒/m³) S(x) ; 養殖場から x m 離れた場所の卵密度(粒/m³) D ;1m当りの密度変化係数4. 養殖場で産出されるマダイ卵の量は1シーズンで約300億粒と推定された. それらの卵が湾内に残存する割合は,発生段階が24時間異なる卵の分布密度比から,1日当り約45%と推定された、なお,マダイ卵は産出後ふ化までに約2日間を要することとふ化率を考慮すれば,湾内でふ化する仔魚は 産出卵量の約14%,約43億尾と試算される. | |||||||||||||||||
| 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 57, p. 1-17, ページ数 17, 発行日 1982-03 |
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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_57_1 | |||||||||||||||||
| 関連サイト | ||||||||||||||||||
| 識別子タイプ | URI | |||||||||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010261862 | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||||||||
