Results 71 to 80 of about 430 (170)
Sample Design-based Methodology for Estimating Delta Smelt Abundance
San Francisco Estuary and Watershed Science, 2008 A sample design-based procedure for estimating pre-adult and adult delta smelt abundance is described. Using data from midwater trawl surveys taken during the months of September, October, November, and December for the years 1990 through 2006 and ...
Ken B. Newman
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A Computer Simulation for the Net Position Control of Midwater Trawl System.
NIPPON SUISAN GAKKAISHI, 2001 中層トロール漁法では, 常に目標魚群に対して網位置を迅速に制御しなければならない。本論文では, 著者らが提案した中層トロールシステムの運動特性を求めるモデルに基づいて, 東京水産大学の練習船神鷹丸に装備されている中層トロール網を例とした網位置の制御シミュレーションを行った。ワープ長または船速を制御入力とした網位置の動態は海上実験で捉えた現象をよく再現した。シミュレーションの結果を実操業に応用する例として, あるワープ長と船速における網位置から, ワープ長と船速を調整することで, 探知された目標魚群の位置へ網をより迅速に制御する方法を示した。また, 探索曳網中の初期ワープ長による制御出力(水深および制御時間)への影響が小さいことも確かめられた ...
Hu, Fuxiang, Tokai, Tadashi, Matuda, Ko
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IDEALIZING THE DESIGN MODEL OF THE ROPE PART OF THE MIDWATER TRAWL
Vestnik of Astrakhan State Technical University. Series: Fishing industry, 2018 The article presents a perspective approach to the analysis of a stress state of net gear. A set of assumptions and simplifications of determining the forces acting on the end part of the trawl have been proposed. In terms of strength analysis of the trawl gear elements, the rope section deserves a thorough study, since the rope section elements are ...
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Frontiers in Marine ScienceAntarctic krill (Euphausia superba) is a harvested species that has an important role in the Southern Ocean food web. Knowledge on the demography of Antarctic krill is necessary for a better understanding of the distribution of life stages and their ...
Fokje L. Schaafsma +10 more
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Известия ТИНРО, 2015 Zooplankton and pelagic fish samples collected on the eastern Bering Sea shelf in late summer 2003-2010 were used to evaluate spatial and temporal changes in the plankton and nekton community structure.
Lisa B. Eisner +2 more
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Characteristics of Dynamic Control of Midwater Trawl System in Field Experiments.
NIPPON SUISAN GAKKAISHI, 1994 In order to investigate the characteristics of dynamic control of a midwater trawl, a field experiment was conducted by FRV “SINYO-Maru” of Tokyo University of Fisheries. The parameters of the midwater trawl being towed were measured with a SCANMAR system and a self-recording underwater load-depth meter.
Fuxiang Hu, Ko Matuda, Kaname Sato
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Lanternfish (Myctophidae) from eastern Brazil, southwest Atlantic Ocean
Latin American Journal of Aquatic Research, 2014 Twenty-nine species from 11 genera of Myctophidae were taken in daytime midwater and bottom trawl hauls off eastern Brazil (11º-22ºS). Trawls were performed aboard the French R/V Thalassa to depths from 19 to 2271 m, including samples from shelf, slope ...
Adriana da Costa Braga +4 more
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Driving anchovy larvae by large mesh wings of pair midwater trawl.
NIPPON SUISAN GAKKAISHI, 1990 Wing meshes of commercial pair midwater trawls for catching anchovy larvae are as large as 360cm at the distal part and 15cm at the proximal part. Echo surveys were made using a 200kHz fish finder to examine if the larvae were driven into the net mouth by the wings of the extremely large meshes or escaped through the meshes.
Kawamura, Gunzo, Tabata, Koichiro
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Mesopelagic Fish Biodiversity in the Ligurian Cetacean Sanctuary
DiversityMesopelagic fish belonging to the families Gonostomatidae, Phosichthyidae, Sternoptychidae, Stomiidae, Paralepididae, Myctophidae, Evermannellidae, Microstomatidae, and Nemichthyidae were sampled using an Isaacs Kidd Midwater Trawl (IKMT) in the Ligurian
Luca Lanteri +7 more
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Model tests of high speed midwater trawls with large meshes.
NIPPON SUISAN GAKKAISHI, 1990 Midwater trawling technology has become important since the early 1980's for harvesting underutilized fast swimming fish. Developmental work has involved fishing trials with full scale midwater trawls by the Japan Marine Resources Development Center (JAMARC).
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