Selectivity of grid separator with horizontal bars for beam trawl fishery in Tokyo Bay

2008 ◽  
Vol 74 (1) ◽  
pp. 8-13 ◽  
Author(s):  
SATOSHI OHATA ◽  
NAOYA IKEGAMI ◽  
FUMIO NAKAMURA ◽  
KAORU FUJITA ◽  
YOSHIKI MATSUSHITA
Keyword(s):  
Tokyo Bay ◽  
Beam Trawl ◽  
Trawl Fishery

scholarly journals Reaction of juvenile flounder to grid separators

2004 ◽  
Vol 61 (7) ◽  
pp. 1174-1178 ◽  
Author(s):  
Yoshiki Matsushita ◽  
Kaoru Fujita ◽  
Naoya Ikegami ◽  
Satoshi Ohata
Keyword(s):  
Paralichthys Olivaceus ◽  
Japanese Flounder ◽  
Tokyo Bay ◽  
Considerable Proportion ◽  
Beam Trawl ◽  
Light Conditions ◽  
Trawl Fishery ◽  
Selection For ◽  
Dark Conditions ◽  
Grid Selection

Abstract The reaction behaviour of juvenile Japanese flounder (Paralichthys olivaceus) to towed grids (0.5 × 0.2 m, horizontally, or vertically orientated bars at 10-mm intervals) was observed as a means of understanding fish behaviour in relation to grid selection for a beam trawl fishery in Tokyo Bay. Reaction behaviours were categorized within four patterns by grid types and illumination levels: (i) forward swimming in towed direction; (ii) swimming over the grid; (iii) sticking on the grid; and (iv) passing through the grid. The most dominant reaction pattern was forward swimming, but its ratio was higher for light than for dark conditions. Passing through the grid bars occurred most frequently with horizontal bars. Approximately 40% of tested fish passed through the grid in light conditions, approximately 30% in dark conditions. Most of these fish penetrated bar gaps head first, while a considerable proportion categorized as “forward swimming” kept swimming even though their tails or bodies had partly passed between the bars. It is concluded that penetration of flounders through bar gaps is governed by voluntary actions.

scholarly journals Predictive framework for codend size selection of brown shrimp (Crangon crangon) in the North Sea beam-trawl fishery

PLoS ONE ◽  
2018 ◽  
Vol 13 (7) ◽  
pp. e0200464 ◽  
Author(s):  
Juan Santos ◽  
Bent Herrmann ◽  
Daniel Stepputtis ◽  
Claudia Günther ◽  
Bente Limmer ◽  
...  
Keyword(s):  
North Sea ◽  
Brown Shrimp ◽  
Beam Trawl ◽  
Crangon Crangon ◽  
Size Selection ◽  
Trawl Fishery ◽  
The North ◽  
Sea Beam ◽  
The North Sea ◽  
Selection Of

A selective effect of grid and window net in the shrimp beam trawl fishery

2015 ◽  
Vol 51 (3) ◽  
pp. 375-386 ◽  
Author(s):  
Choong–Sik JANG ◽  
Youn–Hyoung CHO ◽  
Young–Su AN
Keyword(s):  
Beam Trawl ◽  
Selective Effect ◽  
Trawl Fishery

scholarly journals Testing a size sorting grid in the brown shrimp (Crangon Crangon Linnaeus, 1758) beam trawl fishery

2020 ◽  
Vol 231 ◽  
pp. 105716
Author(s):  
T. Veiga-Malta ◽  
J.P. Feekings ◽  
R.P. Frandsen ◽  
B. Herrmann ◽  
L.A. Krag
Keyword(s):  
Brown Shrimp ◽  
Beam Trawl ◽  
Crangon Crangon ◽  
Trawl Fishery ◽  
Size Sorting

Reproductive biology of Polybius henslowii Leach, 1820 (Decapoda, Polybiidae): a discard species from the northwestern Portuguese beam trawl fishery

Crustaceana ◽  
2014 ◽  
Vol 87 (7) ◽  
pp. 784-800 ◽  
Author(s):  
L. Magalhães ◽  
M. Felício ◽  
M. B. Gaspar ◽  
V. Quintino ◽  
A. M. Rodrigues
Keyword(s):  
Reproductive Biology ◽  
Current Knowledge ◽  
Carapace Width ◽  
Fishing Gear ◽  
Northern Coast ◽  
Beam Trawl ◽  
Total Catch ◽  
Important Species ◽  
Trawl Fishery ◽  
Minimum Landing Size

Polybius henslowii Leach, 1820, a Portunid crab distributed from the British Isles to Morocco and the Mediterranean Sea is caught in high densities by many types of fishing gear and frequently thrown back to the sea. Along the northern coast of Portugal, P. henslowii is an important species discarded in beam trawl fishery. There are no quantitative estimations of discards and very little is known about its biology, information that is needed to value this species. The present work was conducted from March 2007 to December 2010 in order to improve the current knowledge of the reproductive biology of P. henslowii. By-catches were registered aboard commercial vessels that volunteered to participate in the study. In that period P. henslowii represented 57.3% of the total catch and was present in all hauls analysed. The target species, Palaemon serratus (Pennant, 1777), represented 1.2% of the total catch, showing the low selectivity of the fishing gear and the need for suppression of this gear to catch this shrimp species. Differences in size between sexes were found, with males being larger and heavier than females. Mature females occurred mainly in autumn and the carapace width at which 50% of the females reach maturity was estimated to be 37.8 mm, which could be set as the minimum landing size of this potential exploitable resource. A macroscopic ovarian maturity stages classification was proposed, allowing a rapid field assessment of female sexual maturity. This study fills a gap in the knowledge of a very important species discarded in beam trawl fishery that may be basis of further work.

Mortality of brown-shrimp discards from the beam trawl fishery in the Tagus estuary, Portugal

2003 ◽  
Vol 63 (3) ◽  
pp. 423-427 ◽  
Author(s):  
Rita Gamito ◽  
Henrique Cabral
Keyword(s):  
Brown Shrimp ◽  
Tagus Estuary ◽  
Beam Trawl ◽  
Trawl Fishery

scholarly journals Species-separation Efficiency of Small Beam Trawl for Mantis Shrimp in Tokyo Bay.

1997 ◽  
Vol 63 (5) ◽  
pp. 715-721 ◽  
Author(s):  
Tadashi Tokai ◽  
Shigeyuki Omoto ◽  
Yasuzumi Fujimori ◽  
Haruyuki Kanehiro ◽  
Ko Matuda
Keyword(s):  
Separation Efficiency ◽  
Tokyo Bay ◽  
Beam Trawl ◽  
Mantis Shrimp ◽  
Species Separation

scholarly journals Modelling combined harvest and effort regulations: the case of the Dutch beam trawl fishery for plaice and sole in the North Sea

2008 ◽  
Vol 65 (6) ◽  
pp. 822-831 ◽  
Author(s):  
A. Hoff ◽  
H. Frost
Keyword(s):  
North Sea ◽  
Stock Assessment ◽  
Beam Trawl ◽  
Trawl Fishery ◽  
The North ◽  
Feedback Model ◽  
Economic Operation ◽  
The North Sea ◽  
Fishing Fleets ◽  
Fleet Dynamics

Abstract Hoff, A. and Frost, H. 2008. Modelling combined harvest and effort regulations: the case of the Dutch beam trawl fishery for plaice and sole in the North Sea. – ICES Journal of Marine Science, 65: 822–831. Currently, several European fishing fleets are regulated through a combination of harvest and effort control. The two regulation schemes are interrelated, i.e. a given quota limit will necessarily determine the effort used, and vice versa. It is important to acknowledge this causality when assessing combined effort and harvest regulation systems. A bioeconomic feedback model is presented that takes into account the causality between effort and harvest control by switching back and forth between the two, depending on which is the binding rule. The model consists of a biological and an economic operation module, the former simulating stock assessment and quota establishment, and the latter simulating the economic fleet dynamics. When harvest control is binding, catch is evaluated using the biological projection formula, whereas the economics-based Cobb–Douglas production function is used when effort is binding. The method is applied to the Dutch beam trawl fishery for plaice and sole in the North Sea.

Short-term survival of discarded target fish and non-target invertebrate species in the “eurocutter” beam trawl fishery of the southern North Sea

2014 ◽  
Vol 154 ◽  
pp. 82-92 ◽  
Author(s):  
Jochen Depestele ◽  
Marieke Desender ◽  
Hugues P. Benoît ◽  
Hans Polet ◽  
Magda Vincx
Keyword(s):  
North Sea ◽  
Beam Trawl ◽  
Short Term ◽  
Term Survival ◽  
Trawl Fishery ◽  
Invertebrate Species ◽  
Southern North Sea ◽  
Target Fish ◽  
Short Term Survival
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