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.

scholarly journals Comparison of beam trawl catch, by-catch and discard in fishing and non-fishing areas – a case study from the northern Adriatic Sea

2021 ◽  
Vol 22 (1) ◽  
pp. 108
Author(s):  
DARIA EZGETA -BALIĆ ◽  
NEDO VRGOČ ◽  
IGOR ISAJLOVIĆ ◽  
DAMIR MEDVEŠEK ◽  
ANTE VUJEVIĆ ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Beam Trawl ◽  
Northern Adriatic Sea ◽  
Important Species ◽  
Northern Adriatic ◽  
Trawl Fishery ◽  
Trawl Catch ◽  
Commercially Important ◽  
By Catch ◽  
Trawl Fisheries

Beam trawl fishery is highly important in the Croatian part of the northern Adriatic wherein 116 vessels have a licence for this type of fishing gear. A sharp decrease in the beam trawl catch observed since 2015 has raised concern about not only socio-economic issues but also ecological issues and the effect that beam trawl fisheries have had on exploited stocks. Besides the effect that beam trawl fisheries can have on targeted economically important species, intensive dredging can cause long-term changes in the benthic community. Therefore, this study aimed to detect the effect that this type of fishing gear has on target and by-catch species. Furthermore, survey data were compared with the official beam trawl fishery data gathered through Vessel Monitoring System data together with fishermen’s logbooks. Our research targeted two adjacent areas: an area where beam trawl fishing is allowed and an area where it is forbidden. The results demonstrate that the commercially important catch represented a minor share of the total beam trawl catch in both survey areas, while discard made up more than 93% of the total catch. The main beam trawl commercially important species in the Croatian part of the northern Adriatic Sea was Pecten jacobaeus, followed by Solea solea and Ostrea edulis. Our results suggest that beam trawl fisheries mostly affect target bivalve species and some non-commercial benthic species (e.g. sponges). The differences recorded between areas could suggest that beam trawl fisheries cause changes mostly in the P. jacobaeus population.

scholarly journals PENGARUH UKURAN MATA JARING BUBU LIPAT TERHADAP JUMLAH DAN UKURAN HASIL TANGKAPAN RAJUNGAN DI PERAIRAN UTARA LAMONGAN, JAWA TIMUR

2018 ◽  
Vol 24 (3) ◽  
pp. 175
Author(s):  
Mahiswara Mahiswara ◽  
Hufiadi Hufiadi ◽  
Baihaqi Baihaqi ◽  
Tri Wahyu Budiarti
Keyword(s):  
Carapace Width ◽  
Mesh Size ◽  
Fishing Gear ◽  
Total Catch

Bubu lipat merupakan alat tangkap yang banyak dioperasikan nelayan untuk menangkap rajungan, namun memiliki selektivitas rendah tergantung pada ukuran mata jaring yang digunakan. Tingkat selektivitas bubu lipat perlu ditingkatkan agar tangkapan rajungan memiliki ukuran layak tangkap sesuai peraturan. Penelitian uji coba pengoperasian bubu lipat rajungan dengan berbagai ukuran mata jaring yaitu 1¼ , 2, 2½ dan 3 inci, berbentuk bujur sangkar telah dilakukan di perairan utara Lamongan, Jawa Timur. Jumlah bubu lipat yang dioperasikan untuk setiap ukuran mata jaring sebanyak 150 unit per tawur/setting. Tujuan penelitian, untuk mengetahui pengaruh ukuran mata jaring bubu terhadap jumlah dan ukuran hasil tangkapan rajungan. Hasil analisis menunjukkan bahwa perbedaan ukuran mata jaring berpengaruh nyata terhadap hasil tangkapan bubu lipat rajungan. Hasil tangkapan rajungan dari bubu lipat mata jaring 2 inci (2,17 kg/setting) tidak berbeda nyata dengan mata jaring 1¼ inci (2,08 kg/setting). Ukuran lebar karapas (CW=carapace width) rajungan layak tangkap (> 100 mm) semakin besar dengan meningkatnya ukuran mata jaring. Nilai tertinggi prosentase tangkapan rajungan ukuran besar (CW > 100 mm), ditemukan pada bubu lipat ukuran mata jaring 3 inci mencapai 98 % dari total rajungan yang tertangkap. Collapsible crab pot is a common fishing gear that has been operated by many fishermen, however this kind of fishing gear has a low selectivity. The selectivity level of crab pot needs to be increased so that the size of crab catch comply to the allowable legal size. Fishing trials of crab pot with the mesh size of 1¼, 2, 2½ and 3 inch square-shaped has been done in the waters of north Lamongan, East Java. The objectives of this research is to determine the effect of mesh size to the number and size of the catches. The results showed that different mesh size has significant effect on the catch of pot. However the catch of a 2 inch mesh size pot (of 2.17 kg / setting) was not significantly different with the catch of pot with 1¼ inch mesh size (of 2.08 kg / setting). Percentage of BSC catch with carapace width (CW) > 100 mm increased by increasing of mesh size of net. The highest percentage (98 % of the total catch) was obtained from  the 3-inch mesh sizes.

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

scholarly journals A first appraisal of the landing and mechanism of the Santos fishery

1960 ◽  
Vol 11 (1) ◽  
pp. 05-85 ◽  
Author(s):  
I. D. Richardson ◽  
M. N. de Moraes
Keyword(s):  
Fishing Gear ◽  
Important Species ◽  
Fishing Area ◽  
Important Fish

This paper summarizes and analyses the landing data collected at Santos, Brazil, during the 12 months period, July 1958-June 1959. These data are given in terms of weight landed of the more important fish and shrimp and also in terms of value. The distribution of the landings of each of the more important species is shown both according to the type of fishing gear used and fishing area. The fishing area is given in the form of statistical rectangles of 60 miles square. The landings are broken down to obtain a figure for the landing per hour of fishing for each species, for each gear and for each rectangle fished. This figure of landing per unit fishing time is used to compare one area with another, one gear with another, and one month with another for each of the important species. In this way, comparisons of the available density of a species by time, area and fishing gear are made.

scholarly journals Factors affecting rule compliance with mesh size regulations in the Baltic cod trawl fishery

2007 ◽  
Vol 64 (8) ◽  
pp. 1603-1606 ◽  
Author(s):  
Petri Suuronen ◽  
Vesa Tschernij ◽  
Pekka Jounela ◽  
Daniel Valentinsson ◽  
P-O. Larsson
Keyword(s):  
Gadus Morhua ◽  
Management Practice ◽  
Mesh Size ◽  
Factors Affecting ◽  
Trawl Fishery ◽  
Management Measures ◽  
Gradual Introduction ◽  
Minimum Landing Size ◽  
The Baltic ◽  
Baltic Cod

Abstract Suuronen, P., Tschernij, V., Jounela, P., Valentinsson, D., and Larsson, P-O. 2007. Factors affecting rule compiance with mesh size regulations in the Baltic cod trawl fishery. – ICES Journal of Marine Science, 64: 1603–1606. In this study, we evaluate the efficiency and applicability of a series of gear-based management measures, enforced since 1990, whose purpose was to improve size selectivity in the trawl fishery for Baltic cod (Gadus morhua). In general, our study revealed that these measures had no marked effect on the capture and discard of young cod. Legal and illegal manipulation of selective codends was widespread. The adoption of a codend design that offered a modest increase in selectivity, but had a good match with the legislated minimum landing size (MLS), led to greater compliance, demonstrating that a mismatch between MLS and selectivity should be avoided. It was also obvious that, generally, the fishing industry did not tolerate large short-term losses. Our evaluation is that overly ambitious rules will be circumvented, and frequent and incoherent changes in the regulations represent bad management practice. A gradual introduction of restrictions and participation by fishers in the decision-making process will increase compliance.

scholarly journals PENGEMBANGAN LAMPU BAWAH AIR SEBAGAI ALAT BANTU PADA BAGAN TANCAP DI DESA TAMBAK LEKOK KECAMATAN LEKOK PASURUAN

2016 ◽  
Vol 9 (1) ◽  
pp. 7
Author(s):  
F Fuad ◽  
S Sukandar ◽  
Alfan Jauhari
Keyword(s):  
Fishing Gear ◽  
Total Catch ◽  
Fish Catch ◽  
To Come ◽  
Almost All

<p><em>DEVELOPMENT OF UNDER WATER LAMP AS A TOOL TO LIFT NET IN TAMBAK LEKOK VILLAGE PASURUAN</em></p><p><em><br /></em></p><p><em>Bagan is one type of fishing gear that uses light to collect fish. The lights are expected to stimulate the fish to come and stay around the light and than arrested with net. The use of light for fishing is growing rapidly, almost all fishing gear to use light as a tool for collecting fish. Application of this technology aims to increase fish catch fishermen in District Lekok through the application of technology underwater lamp with LED. Underwater lamp applied to the bagan tancap with a certain intensity and color to find the intensity of light and color that give the best catches. Best catches in the light of 450 lux is capable of delivering the highest total catch of 254 kg, it is supported by the values of illumination of 1.5 lux at a distance of 5 m. Types of fish that were caught on as much as 23 step chart types where the type of Stolephorus spp, Selaroides spp, Leiognathus spp, Loligo sp, Rastrelliger spp is a type of fish that always caught each fishing operation.</em></p><p> </p><p><strong>Keywords</strong>:<em> auxilary, development, lamp, Lekok, lift net </em></p><p align="center"><strong> </strong></p><p align="center"><strong>ABSTRAK</strong></p><p align="center"><strong> </strong></p><p><em>Bagan merupakan salah satu jenis alat tangkap yang menggunakan lampu sebagai alat bantu pengunpul ikan. Cahaya lampu diharapkan </em><em>dapat merangsang ikan untuk datang dan berkumpul disekitar sumber cahaya sampai pada suatu catchable area tertentu, lalu penangkapan dilakukan dengan alat jaring maupun pancing. Penggunaan lampu untuk penangkapan ikan saat ini berkembang pesat, hampir semua alat tangkap menggunakan lampu sebagai alat bantu pengumpul ikan. </em><em>Aplikasi teknologi ini bertujuan untuk meningkatkan hasil tangkapan ikan nelayan bagan tancap di Kecamatan Lekok melalui penerapan teknologi lampu celup bawah air berbasis lampu LED. Lampu celup bawah air diterapkan pada bagan tancap dengan intensitas dan warna tertentu untuk mencari intensitas cahaya dan warna yang memberikan hasil tangkapan yang terbaik. </em><em>Hasil tangkapan ikan yang terbanyak adalah pada lampu 450 lux yang mampu memberikan total tangkapan terbanyak 254 kg, hal ini didukung dengan nilai nilai illuminasi sebesar 1,5 lux pada jarak 5 m. Jenis ikan yang tertangkap pada bagan tancap sebanyak 23 jenis dimana jenis ikan teri (</em><em>Stolephorus</em><em> spp), ikan selar (Selaroides spp), ikan pepetek (Leiognathus spp ), cumi – cumi (Loligo sp), ikan kembung (Rastrelliger spp) merupakan jenis ikan yang selalu tertangkap disetiap operasi penangkapan.</em> <em></em></p><p> </p><p><strong>Kata kunci</strong>: a<em>lat bantu, bagan tancap, lampu, Lekok, pengembangan</em></p>

PEMANFAATAN ALAT BANTU RUMPON ELEKTRONIK TERHADAP PENINGKATAN HASIL TANGKAPAN PADA ALAT TANGKAP GILL NET DI WILAYAH PESISIR KAB. BULUKUMBA

2021 ◽  
Vol 4 (1) ◽  
pp. 91-104
Author(s):  
Rahmat Bin Aburaera Sileh ◽  
Danial Sultan ◽  
Ihsan Ihsan
Keyword(s):  
Data Collection ◽  
Deep Sea ◽  
Sustainable Management ◽  
Management Strategy ◽  
Fishing Gear ◽  
Total Catch ◽  
Community Based ◽  
Shallow Marine ◽  
Fishing Trip ◽  
Gill Net

The purpose of this study was to determine the yield and type of catch, the comparison of the number of catches and the efforts to manage electronic FADs on Gill Net fishing gear. This research was conducted in Bulukumba waters from February to March 2017. Data collection was carried out by direct observation of fishermen in Bulukumba waters. The samples used in this study were FADs installed by fishermen in the waters of Bulukumba as many as 20 locations. Based on the research results, fish catches with electronic FADs ranged from 98 to 131 fish per fishing trip with a total catch of 2,324 fish. Meanwhile, the usual FAD catches ranged from 51 to 84 fish per fishing trip with a total catch of 1,313 fish and the highest type of fish was selar, followed by male mackerel, Selar bentong, white Kuwe, Layang, Barracuda, selangat and Mata goyang. The ratio between the catch and the use of electronic FADs was 64%, while the regular FADs were 36%. Considering that FADs are an effective tool in collecting fish, a sustainable management strategy is needed, including by (1) community based management, (2) limiting fishing efforts, (3) stopping the addition of shallow marine FADs. , (4) use of fishing gear with large mesh sizes and (5) prioritize the use of deep sea FADs.

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 Morphological description of six species of Suberitida (Porifera: Demospongiae) from the unexplored north-eastern coast of Brazil, with emphasis on two new species

2020 ◽  
Vol 100 (3) ◽  
pp. 389-400
Author(s):  
Humberto F. M. Fortunato ◽  
Thierry Pérez ◽  
Gisele Lôbo-Hajdu
Keyword(s):  
Current Knowledge ◽  
Atlantic Coast ◽  
Marine Sponges ◽  
Eastern Coast ◽  
Morphological Description ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Western Atlantic ◽  
The North ◽  
North Eastern

AbstractThe Order Suberitida is defined as a group of marine sponges without an obvious cortex, a skeleton devoid of microscleres, and with a deletion of a small loop of 15 base pairs in the secondary structure of the 28S rDNA as a molecular synapomorphy. Suberitida comprises three families and 26 genera distributed worldwide, but mostly in temperate and polar waters. Twenty species were reported along the entire Brazilian coast, and although the north-eastern coast of Brazil seems to harbour a rich sponge fauna, our current knowledge is concentrated along the south-eastern Atlantic coast. A survey was implemented along the northern coast of Brazil, and the collection allowed the identification of six species belonging to the Order Suberitida. Two of them are considered new to science: Suberites purpura sp. nov., Hymeniacidon upaonassu sp. nov., and four, Halichondria (Halichondria) marianae Santos, Nascimento & Pinheiro, 2018, Halichondria (H.) melanadocia de Laubenfels, 1936, Suberites aurantiacus (Duchassaing & Michelotti, 1864), and Terpios fugax Duchassaing & Michelotti, 1864, are re-described. Taxonomic comparisons are made for Tropical Western Atlantic species and type species of the four genera. Finally, an identification key for the Western Atlantic Suberites species is provided.

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