このエントリーをはてなブックマークに追加
ID 41489
file
title alternative
New Device of the High Speed Surface Larva Net with the Result of Test Operation
creator
Hayashi, Tomoo
Takahashi, Masao
Miyabayashi, Yutaka
Fukuura, Yoshiyuki
Go, Akio
Takeno, Hyoma
NDC
Fishing industry. Fisheries
abstract
1) 調査船の舷側を3~ 4ノットで,船橋より常時監視しながら曳網できる,表層用稚魚網(Fig. 1, 5)を試作した。
2) 網を舷側から離し,網が浮きあがらないようにするため,オッターボード,デプレッサー,フロートをとりつけたステンレススチール製の網枠(Fig. 2)を作り,これにナイロン製のもじ網の細長い網(Fig. 3)を取り付けた。
3) 曳網試験を行った結果(Fig. 4, Table. 1) 船首波の影響をほとんどうけずに3~4 ノットで曳網できた。4ノット20分間曳による採集物にはほとんど損傷は見られない。
abstract
1) A New type of a surface larva net (Fig.1) was devised and constructed, that could be towed at a rather high speed (3-4 knots) in pararell line with the run of a ship and could also be kept within observable range throughout the operation from the bridge of the of the ship.
2) A stainless steel frame (Fig.2) keeping the mouth of the net open was designed and was equipped with a pair of otter boards, a depresser and a float, in order to keep the net in operation just beneath a water surface without any influence of the bow wave of ship. A net (Fig.3) was made of minnow net of nylon webbing and was installed to the frame.
3) Test operations of the net at seas (Fig. 4, 5, Table. 1) revealed that it could work as predicted, at least within towing speeds of 3 to 4 knots and that fish larvae collected by towing at a speed of 4 knots for 20 minutes showed significantly reduced injury when the codend with a closed end PVC adaptor (Fig. 3-b).
description
本研究は,文部省科学研究費(444012) 「瀬戸内海における生物生産の特性に 関する研究」によるものである。
journal title
Journal of the Faculty of Applied Biological Science, Hiroshima University
volume
Volume 19
issue
Issue 2
start page
215
end page
220
date of issued
1980-12-25
publisher
広島大学生物生産学部
issn
0387-7647
ncid
naid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
他の一覧