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深海曳網監視装置による近底層生物採集
https://fra.repo.nii.ac.jp/records/2005374
https://fra.repo.nii.ac.jp/records/2005374208640e6-3a32-4342-9467-0d47d819bfb5
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||||||||||||
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| 公開日 | 2024-05-22 | |||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||
| タイトル | 深海曳網監視装置による近底層生物採集 | |||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||
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| タイトル | Collection of Near-bottom Pelagos by the Net equipped with Deep Tow Monitoring System : A Preliminary Survey of 100-200 m Layer avobe the 6200 m Bottom | |||||||||||||||||||||||
| 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 |
梅津, 武司
× 梅津, 武司× 敦賀, 花人× 末木, 信之甫
× 中山, 覚介
× 菊池, 贇洋
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| 抄録 | ||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||
| 内容記述 | It is said that in the deep ocean, biomass decreases exponentially with depth, and in near-bottom, it possibly increases a little as compared to above layer. In order to reveal this phenomena, biomass data near the ocean floor must be collected more extensively. Down to a depth of 5000 m, about a hundred samplings of deep-sea pelagos have been made with KOC-net by R/V Kaiyo-maru. Kaiyo-maru's Opening Closing net (KOC-net) is consisted of 3 × 3 m frame fitted with 5.6 mm mesh size minnow net and Catch Didiving Buchet of Foxton type. Damper of CDB operates with precision timers and its movement is doubly checked with 2 magnetic clocks. Sampling down to 700 m deep, we monitored the net depth on board at real-time by an acoustic net-recorder, but below this depth we only checked the sampling layer after the net recovery with the strain-gauge depth recorder. At real-time we can only guess the towing layer by experience with the warp length, angle, tension, ship's speed and current, etc. The maximum depth we could so far maneuver KOC-net was 5000 ± 100 m at Station B in the western North Pacific where the depth of the sea floor was 6200 m. For sampling near-bottom without using conductive cable, we devised a new Deep Tow Monitoring System using an acoustic telemetry. The present assembly consisted of 2 underwater units and a deck unit. First unit, the transceiver, 67 kg in weight : on a frame were mounted a pulse generator & receiver (140 × 155 mm ϕ), a transmitter (175 × 155 mm ϕ ), and a stainless steel case ( 555 × 125 mm ϕ) in which a frequency modulator and Ni-Cd cell (16.8 V, 6 AH ) were contained. Second unit, the receiver, 35 kg : a box (150 × 125 × 160 mm ) was attached to the horizontal (920 × 650 mm ) and vertical (920 × 310 mm) vanes. The transceiver was tied on the bridles between the frame of KOC-net and the swivel of the terminal of warp: 12 mm ϕ of 12000 m wire. From the port side boom astern the ship, the receiver was suspended subsurface 20 m, and towed by the coaxical cable of 10 mm ϕ. The cable was connected to recording unit on the bridge. Down-looking 24 kHz pulse with a beam of 35° was generated in 2.5 msec length every 30 sec to the ocean floor. Received reflecting waves were modulated to 15 kHz and transmitted with 60° beam toward the vessel about 10 km away. Received signals, through the amplifier, were fed to recording unit. Distance between KOC-net and the bottom were printed 10 times in 30 sec as same black lines on the dry paper with timing belt. After two test cruises, we towed DTMS 7 times at near-bottom in June 13-18 1982 near Station B at 30°30'N-147°00'E. It took 11-14 hrs to maneuver one 180-min horizontal tow. The maximum detectable distance was 700 ± 30 m. When DTMS was used as an upper-looking sonar, we could clearly monitor the net depth till 1700 m, but below 2000 m DTMS was useless. Though tows were not always successful, the biomass ranged 0-19 g wet weight per tow : crustaceans occurred at 460-730 m above bottom (3 tows), 900-1500 m (1 tow ) and a holothuroidean occurred at 115-195 m (1 tow ). None was found in two samples at 95-200 m and 200-700 m respectively. Assuming the gross filtered volume by KOC-net 180-min tow was about 1 × 10⁵ m³, average biomasses were 7.5g /10⁵ m³ ( 0-23 g, CV 114 %, n= 8) at 3400-4400 m and 2.8 g /10⁵ m³ (0-9.3g, CV 130 %, n= 6) at 4600-5700 m respectively. At 5900-6100 m, i.e. 100-200 m above bottom one sample had nothing, and another had 19 g Peniagone sp. of Holothuroidea only per tow (wet weight biomass/10⁵ m³). | |||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| 書誌情報 |
ja : 東海区水産研究所研究報告 en : Bulletin of Tokai Regional Fisheries Research Laboratory 巻 110, p. 13-26, ページ数 14, 発行日 1983-03-25 |
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| 出版者 | ||||||||||||||||||||||||
| 出版者 | 東海区水産研究所 | |||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||
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| 出版者 | Tokai Regional Fisheries Research Laboratory | |||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||
| ISSN | ||||||||||||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||||||||||||
| 収録物識別子 | 0040-8859 | |||||||||||||||||||||||
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| 収録物識別子タイプ | NCID | |||||||||||||||||||||||
| 収録物識別子 | AN00156834 | |||||||||||||||||||||||
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| 識別子タイプ | Local | |||||||||||||||||||||||
| 関連識別子 | tokai_k_110_13 | |||||||||||||||||||||||
| 関連サイト | ||||||||||||||||||||||||
| 識別子タイプ | URI | |||||||||||||||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010281139 | |||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||||||||||||||
