scholarly journals III-2. Fishing gear design utilizing information of fish school behavior

2012 ◽  
Vol 78 (5) ◽  
pp. 1023-1023
Author(s):  
HIROMI KINOSHITA
Keyword(s):  
Fishing Gear ◽  
School Behavior ◽  
Fish School ◽  
Gear Design

scholarly journals INFLUENCE OF TURBIDITY ON FISH SCHOOL BEHAVIOR OF PLECOGLOSSUS ALTIVELIS ALTIVELIS IN STATIC WATER

2016 ◽  
Vol 72 (6) ◽  
pp. II_119-II_125
Author(s):  
Kouki ONITSUKA ◽  
Juichiro AKIYAMA ◽  
Keisuke KASUGAI ◽  
Noriaki OHARA ◽  
Kazuya MOMOTANI ◽  
...  
Keyword(s):  
School Behavior ◽  
Plecoglossus Altivelis ◽  
Fish School ◽  
Static Water

Designing and Testing New Fishing Gears: The Value of a Flume Tank

2006 ◽  
Vol 40 (3) ◽  
pp. 44-49 ◽  
Author(s):  
Paul D. Winger ◽  
Harold DeLouche ◽  
George Legge
Keyword(s):  
Computer Aided Design ◽  
Driving Forces ◽  
Fishing Gear ◽  
Model Studies ◽  
Gear Design ◽  
Class Testing ◽  
Science And Art ◽  
Fishing Gears ◽  
And Performance ◽  
Aided Design

Increasing regulations, bycatch restrictions, and concerns over ecosystem impact are now the driving forces for much of the development in fishing gear design occurring world-wide. Industry, government, and universities have responded to these challenges with major advancements in computer aided design, simulation, physical modeling techniques, and world-class testing facilities. Model studies are a critical step in the development of new fishing gears and flume tanks are the de facto standard for investigating their attributes and performance under controlled conditions. This paper discusses the nature of flume tanks, their attributes, as well as the science and art of building and testing scale models of fishing gear.

Innovations in Fishing Gear Design Aiming at the Sustainable Use of Commercial Fish Stocks

2006 ◽  
Author(s):  
Erdmann Dahm
Keyword(s):  
Fishery Management ◽  
Sustainable Use ◽  
Mesh Size ◽  
Fish Stock ◽  
Fishing Gear ◽  
Commercial Fish ◽  
Fish Stocks ◽  
Gear Design ◽  
Ecological Changes ◽  
Open Shape

The present status of some of the fish stocks in North Sea and Baltic shows them to be outside safe biological limits. Reasons for this lie partly in hydrographic and ecological changes not in favour for a constant supply of fresh recruits to the fishery every year. On the other hand, fishery has its share in the observed downward trend by growth overfishing and reducing the size and number of possible spawners. The only mean available for the fishery management to restore a fish stock composed of several year classes is to apply technical measures as e.g.closures in space and time or fishing gear regulations. The breakdown of the historical measure “mesh size regulation in diamond mesh trawls” due to technological progress has created a wave of worldwide research. It has focused on trawl codends where the meshes are held artificially in their most open shape or by introducing into the trawl metal structures able to separate small from big fish or fish from crayfish. A parallel development of a scientifically objective mesh measuring instrument will help to enforce the new regulations. However, longer use of some of the new designs has revealed some deficiencies. Other innovative designs or the concept of certified codends will hopefully ensure the permanently better selectivity of contemporary trawl codends.

scholarly journals Evaluating the impact of gillnet ghost fishing using a computational analysis of the geometry of fishing gear

2007 ◽  
Vol 64 (8) ◽  
pp. 1517-1524 ◽  
Author(s):  
Tsutomu Takagi ◽  
Takashi Shimizu ◽  
Holger Korte
Keyword(s):  
Computational Analysis ◽  
Three Dimensional ◽  
Fishing Gear ◽  
Capture Process ◽  
Gear Design ◽  
Sea Bottom ◽  
Dimensional Shape ◽  
Internal Forces ◽  
Analysis System ◽  
The Impact

Abstract Takagi, T., Shimizu, T., and Korte, H. 2007. Evaluating the impact of gillnet ghost fishing using a computational analysis of the geometry of fishing gear. – ICES Journal of Marine Science, 64: 1517–1524. We developed a net shape and load analysis system (NaLA) that can estimate the three-dimensional shape of fishing gear underwater computationally. This paper introduces the latest version of the numerical model of the NaLA. Previously, NaLA was used to estimate the net geometries and internal forces of some fishing gear, demonstrating its general versatility. However, the ultimate goal of our study has been to learn about the impact of fishing and the capture process from a physical perspective, not simply to develop elemental technologies for gear design. Accurate, quantitative evaluation of fishing gear performance from a physical perspective can be used to estimate the potentialities of the ghost fishing to gillnet gears. Although the applications are not limited to geometries and internal forces, the paper describes how computer-aided simulations of fishing gear should be applied to investigations of the impact of ghost fishing caused by lost drift and bottom gillnets. The computational results showed that a driftnet with homogenous net panels was deformed slightly and bent only at the two ends of the net. Accumulation of periphyton on a bottom gillnet after 25 d of immersion caused it to settle to the sea bottom.

A novel search algorithm based on fish school behavior

2008 ◽  
Author(s):  
Carmelo J. A. Bastos Filho ◽  
Fernando B. de Lima Neto ◽  
Anthony J. C. C. Lins ◽  
Antonio I. S. Nascimento ◽  
Marilia P. Lima
Keyword(s):  
Search Algorithm ◽  
School Behavior ◽  
Fish School
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