scholarly journals Relative Catch Performance of Two Gear Modifications Used to Reduce Bycatch of Undersized Fish and Shrimp in Mediterranean Bottom Trawl Fisheries

2021 ◽  
Vol 13 (5) ◽  
pp. 529-544
Author(s):  
Francesc Maynou ◽  
Alfredo G. García‐de‐Vinuesa ◽  
Pedro Martínez‐Baños ◽  
Pilar Sánchez ◽  
Montserrat Demestre
Keyword(s):  
Bottom Trawl ◽  
Trawl Fisheries

The importance of alien species to the food web and bottom trawl fisheries of the Northeastern Mediterranean, a modelling approach

2020 ◽  
Vol 202 ◽  
pp. 103253 ◽  
Author(s):  
İsmet Saygu ◽  
Johanna J. Heymans ◽  
Clive J. Fox ◽  
Hüseyin Özbilgin ◽  
Ahmet Raif Eryaşar ◽  
...  
Keyword(s):  
Food Web ◽  
Alien Species ◽  
Bottom Trawl ◽  
Trawl Fisheries ◽  
Modelling Approach

scholarly journals Can a square-mesh panel inserted in front of the cod end improve size and species selectivity in Mediterranean trawl fisheries?

2018 ◽  
Vol 75 (5) ◽  
pp. 704-713 ◽  
Author(s):  
Jure Brčić ◽  
Bent Herrmann ◽  
Antonello Sala
Keyword(s):  
Deep Water ◽  
Bottom Trawl ◽  
Horse Mackerel ◽  
Trachurus Trachurus ◽  
Merluccius Merluccius ◽  
Low Probability ◽  
Low Efficiency ◽  
Trawl Fisheries ◽  
European Hake ◽  
Atlantic Horse Mackerel

An experiment was conducted to assess the selectivity in a typical Mediterranean bottom trawl, equipped with a square-mesh panel inserted in front of the cod end, for Atlantic horse mackerel (Trachurus trachurus), European hake (Merluccius merluccius), red mullet (Mullus barbatus), poor cod (Trisopterus minutus), broadtail shortfin squid (Illex coindetii), and deep-water rose shrimp (Parapaeneus longirostris). The release efficiency of undersized individuals through the panel was low. The differences in selectivity between the gear with and without the panel were very small. The low release efficiency of the square-mesh panel was caused by the lack of fish contact with the panel as they drifted towards the cod end, since the average contact probability was estimated not to exceed 9% for any of the species investigated. A low probability of contact with the selection device was thus found to be the reason for the low efficiency of the square-mesh panel.

scholarly journals Modelling potential impacts of bottom trawl fisheries on soft sediment biogeochemistry in the North Sea†

2001 ◽  
Vol 2 (1) ◽  
Author(s):  
Daniel E Duplisea ◽  
Simon Jennings ◽  
Stephen J Malcolm ◽  
Ruth Parker ◽  
David B Sivyer
Keyword(s):  
North Sea ◽  
Bottom Trawl ◽  
Soft Sediment ◽  
The North ◽  
Sediment Biogeochemistry ◽  
The North Sea ◽  
Trawl Fisheries

scholarly journals Old Info for a New Fisheries Policy: Discard Ratios and Lengths at Discarding in EU Mediterranean Bottom Trawl Fisheries

2017 ◽  
Vol 4 ◽  
Author(s):  
Konstantinos Tsagarakis ◽  
Ana Carbonell ◽  
Jure Brčić ◽  
Jose M. Bellido ◽  
Pierluigi Carbonara ◽  
...  
Keyword(s):  
Bottom Trawl ◽  
Fisheries Policy ◽  
Trawl Fisheries

scholarly journals Flexible Turtle Excluder Device (TED): an effective tool for Mediterranean coastal multispecies bottom trawl fisheries

2016 ◽  
Vol 29 (2) ◽  
pp. 201 ◽  
Author(s):  
Alessandro Lucchetti ◽  
Elisa Punzo ◽  
Massimo Virgili
Keyword(s):  
Bottom Trawl ◽  
Trawl Fisheries

scholarly journals Towards more selective Mediterranean trawl fisheries: are juveniles and trash excluder devices effective tools for reducing undersized catches?

2018 ◽  
Vol 82 (S1) ◽  
pp. 215 ◽  
Author(s):  
Sergio Vitale ◽  
Giacomo Milisenda ◽  
Michele Gristina ◽  
Pasquale Baiata ◽  
Sara Bonanomi ◽  
...  
Keyword(s):  
Ad Hoc ◽  
Fishing Effort ◽  
Bottom Trawl ◽  
Steel Bars ◽  
Generalized Additive Mixed Models ◽  
Commercial Species ◽  
Additive Mixed Models ◽  
Sorting Efficiency ◽  
Trawl Fisheries ◽  
European Hake

Mediterranean trawl fisheries are characterized by a critical combination of high fishing effort and low size at first capture for most commercial species. In this study we tested the use of sorting grids installed on bottom trawl nets to minimize the catch of undersized deep-water rose shrimp (Parapenaeus longirostris, DPS) and European hake (Merluccius merluccius, HKE). The catch of a traditional trawl net was compared with that obtained with the same net equipped with ad hoc designed juveniles and trash excluder devices (JTEDs) during an experimental survey. Three different JTEDs were tested: the first (G1-SM40) was built with a net of 40-mm square mesh; the second (G2-ST20) and third (G3-ST25) with vertical steel bars spaced 20 and 25 mm, respectively. The probability of retaining DPS and HKE by length class in trawl nets with and without JTED was analysed using generalized additive mixed models. With G1-SM40, the reduction of undersized individuals in the cod-end was about 60% and 44% for DPS and HKE, respectively. With G2-ST20, a 34% catch decrease of HKE individuals smaller than 20 cm total length was observed. A loss of marketable fractions of DPS was recorded with G1-SM40 (–25%) and G2-ST20 (30%). Finally, JTD G3-ST25 was efficient at reducing the catch of undersized specimens of DPS and HKE, but showed a higher loss of marketable fractions than the other JTEDs. Although further fishing trials would be required to maximize the sorting efficiency of the grids, the results obtained clearly indicated that grids can substantially reduce unwanted catches of undersized DPS and HKE in Mediterranean bottom trawl fisheries.

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