Disparity among recommended and adopted escape-gap designs and their utility for improving selection in an Australian portunid trap fishery

2022 ◽  
Vol 248 ◽  
pp. 106219
Author(s):  
Thomas C. Barnes ◽  
Matt K. Broadhurst ◽  
Daniel D. Johnson
Keyword(s):  
Trap Fishery

Effects of local scale perturbations in the Atlantic bluefin tuna (Thunnus thynnus L.) trap fishery of Sardinia (W. Mediterranean)

2008 ◽  
Vol 92 (2-3) ◽  
pp. 242-254 ◽  
Author(s):  
Piero Addis ◽  
John Mark Dean ◽  
Paola Pesci ◽  
Ivan Locci ◽  
Rita Cannas ◽  
...  
Keyword(s):  
Bluefin Tuna ◽  
Local Scale ◽  
Thunnus Thynnus ◽  
Atlantic Bluefin Tuna ◽  
Trap Fishery

scholarly journals SOSIAL EKONOMI DAN LINGKUNGAN PERIKANAN BUBU DI DESA KARANGSONG KABUPATEN INDRAMAYU, JAWA BARAT

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Muhammad Fitri Rizky ◽  
Zuzy Anna ◽  
Achmad Rizal ◽  
Asep Agus Handaka Suryana
Keyword(s):  
Environmental Analysis ◽  
Financial Analysis ◽  
Primary Data ◽  
Social Aspect ◽  
Fishing Gear ◽  
Environmental Condition ◽  
West Java ◽  
Environment Analysis ◽  
Average Value ◽  
Trap Fishery

Penelitian ini bertujuan untuk menganalisis kondisi sosial, ekonomi dan lingkungan perikanan bubu dan mencari tahu faktor apa yang berpengaruh terhadap kondisi sosial ekonomi dan lingkungan perikanan bubu. Penelitian dilaksanakan di Desa Karangsong, Kabupaten Indramayu, Provinsi Jawa Barat pada bulan Februari tahun 2018 dengan jumlah responden sebanyak 60 orang nelayan alat tangkap bubu. Pengambilan data dilakukan melalui wawancara dengan kuesioner untuk mendapatkan data primer mengenai kondisi perikanan bubu. Analisis sosial meliputi aspek sosio demografi, institusional dan konflik. Analisis finansial meliputi analisis pendapatan dan B/C ratio serta dilakukan analisis regresi untuk mengetahui hubungan antara beberapa variabel input. Analisis lingkungan dilakukan berdasarkan pandangan nelayan mengenai dampak pengoperasian bubu terhadap lingkungan. Aspek sosial menunjukkan nelayan bubu Karangsong tidak memiliki kelompok, ditemukan konflik alat tangkap dan konflik terkait kegiatan perikanan dan hasil tangkapan yang tidak dilaporkan aktifitasnya ke TPI maupn PPI. Hasil analisis finansial didapatkan pendapatan nelayan berkisar antara Rp1.532.000 - Rp5.401.600 dan nilai B/C Ratio rata rata per jenis kapal adalah 2.05 untuk 3 GT, 5.1 untuk 4 GT dan 5.6 untuk 6 GT. Hasil analisis lingkungan diketahui 100% nelayan memiliki perspektif bahwa perikanan bubu ramah lingkungan.Title: Socio-Economic and Environment Analysis of Trap Fishery  Will Karangsong Village Indramayu of West Java This research was conducted in Karangsong, Indramayu, West Java in February 2018 with 60 respondents of traps fishermen. This research aims to analyze the socio-economic and environmental condition of fishing traps and tried to find out what factors influencing the conditions. Primary data were collected through questionnaires and interviews about the condition of fishing traps. Social analysis of the research includes demography, institution and conflict, while financial analysis includes income analysis and B/C ratio as well as regression analysis to find out correlation between inputs. Environmental analysis was built upon fishermen’s perspective about how fishing traps affect the environment. Social aspect of the research found that fishermen did not have any group, and there are many conflicts especially related to fishing gear and unreported fishing. Results in financial analysis found that fishermen’s income  range between IDR 1.532.000 - IDR 5.401.600 and average value of B/C Ratio for 3 GTs, 4 GTs and 6 GTs were 2.05, 5.1 and 5.6, respectively. Environmental analysis indicated that 100% of fishermen perceive that fishing traps are environmentally friendly. 

Relative effects of trap versus trawl fisheries on population dynamics of the northern cod (Gadus morhua) stock

1998 ◽  
Vol 55 (1) ◽  
pp. 76-85 ◽  
Author(s):  
L Fahrig ◽  
S E Pope ◽  
K M Henein ◽  
G A Rose
Keyword(s):  
Population Dynamics ◽  
Gadus Morhua ◽  
Simulation Modelling ◽  
Trawl Fishery ◽  
Trawl Catch ◽  
Stock Biomass ◽  
Northern Cod ◽  
Trap Fishery ◽  
Using Data ◽  
Trawl Fisheries

We compared the effects of the inshore trap and the offshore trawl fisheries on the population dynamics of the northern cod (Gadus morhua) stock using data analyses and simulation modelling. We first statistically characterized the catch versus stock biomass relationships for the two fisheries (1977-1986). We found a significant (P < 0.0001) relationship between the trawl catch at time t and the stock biomass at time t - 2. No temporal lag was evident in the trap catch versus stock biomass relationship. The variability in these two relationships was similar. We then modelled the catch and stock biomass dynamics of the two fisheries in parallel, incorporating the observed catch versus stock biomass relationships, but assuming equal mean catches, to examine the effects on cod population dynamics of the temporal lag and variability in the catch versus stock biomass relationships. The results suggest that, for the same amount of fish taken, a quota-based trawl fishery presents a much greater risk of collapse to the cod stock than does an inshore trap fishery. Current management methods overestimate the "safe" catch for the trawl fishery because they do not incorporate the consequences of the lag in the relationship between stock biomass and trawl catch.

Potential of a trap-fishery for deep-water rock lobster Palinurus delagoae off South Africa

1997 ◽  
Vol 48 (8) ◽  
pp. 993 ◽  
Author(s):  
J. C. Groeneveld ◽  
A. C. Cockcroft
Keyword(s):  
South Africa ◽  
South African ◽  
Deep Water ◽  
Linear Models ◽  
Depth Interval ◽  
Suitable Habitat ◽  
Rock Lobster ◽  
Experimental Phase ◽  
Trap Fishery ◽  
Catch Rates

An experiment to investigate the potential of a trap-fishery for deep-water rock lobster Palinurus delagoae was conducted off the east coast of South Africa between 1994 and 1996. The 75–425 m depth interval between 27°S and 32°S was stratified according to depth and latitude, and three regions (North, Central and South) were sampled systematically over the three years. Sampling by commercial vessels operating long-lines and traps included an experimental phase (fixed fishing positions) and a commercial phase (no restriction on fishing location). Generalized linear models were used to investigate the influence of year, region, sampling phase, month and soak time. Sampling phase was significant, with traps set during the commercial phase catching more than those set in the experimental phase. The effect of soak time on catch rates was not significant. The almost-50% decrease in the combined abundance index combined with a marked decrease in mean lobster size over the study period suggests a relatively low fisheries potential for this species in South African waters; this may be attributable to the relative scarcity of suitable habitat in the area.

The habitats exploited and the species trapped in a Caribbean island trap fishery

2004 ◽  
Vol 71 (3) ◽  
pp. 247-260 ◽  
Author(s):  
Virginia Garrison ◽  
Caroline Rogers ◽  
Jim Beets ◽  
Alan Friedlander
Keyword(s):  
Caribbean Island ◽  
Trap Fishery

A Study on Problems of Wage Payment Manner in Offshore Trap Fishery

2019 ◽  
Vol 50 (1) ◽  
pp. 1-15
Author(s):  
Seong-Ju Moon ◽  
◽  
Woo-Soo Kim ◽  
Jong-Ho Kang
Keyword(s):  
Wage Payment ◽  
Trap Fishery

Mesh selectivity in the New South Wales demersal trap fishery

2003 ◽  
Vol 59 (3) ◽  
pp. 379-392 ◽  
Author(s):  
John Stewart ◽  
Douglas J Ferrell
Keyword(s):  
New South ◽  
New South Wales ◽  
South Wales ◽  
Trap Fishery

scholarly journals Escape ring selectivity, bycatch, and discard survivability in the New England fishery for deep-water red crab, Chaceon quinquedens

2007 ◽  
Vol 64 (8) ◽  
pp. 1579-1586 ◽  
Author(s):  
S. M. L. Tallack
Keyword(s):  
New England ◽  
Deep Water ◽  
Carapace Width ◽  
Discard Mortality ◽  
Male Crab ◽  
Gear Selectivity ◽  
Stock Assessments ◽  
Trap Fishery ◽  
The Impact ◽  
Control Trap

Abstract Tallack, S. M. L. 2007. Escape ring selectivity, bycatch, and discard survivability in the New England fishery for deep-water red crab, Chaceon quinquedens. – ICES Journal of Marine Science, 64: 1579–1586. The trap fishery for red crab, Chaceon quinquedens, occurs at depths of 600–800 m along the continental slope of New England. The target product is a male crab with a carapace width of ∼105 mm or greater. Selectivity was tested at two discrete depths (600 and 800 m), for four different escape ring scenarios: control trap with no escape rings, and escape rings with internal diameters of 9, 10, and 11 cm. Proportions of non-marketable C. quinquedens were large (71–100%) at both depths for all traps, but were smallest in traps with escape rings. Discard mortality was estimated at ∼5% through caging experiments across three haul frequency conditions (every 24 h, every 4 d, and after 8 d), which represented the likely reality of multiple recaptures during a commercial trip. The impact of discarding techniques (low and high impact) was also assessed. If discard proportion estimates of >71% are realistic, and if an estimated ∼5% of these discards die, the recommendation must be made for fishery participants to improve gear selectivity, and thereby to minimize discard mortality rates. On the management side, stock assessments will be more accurate if estimates of discard mortality are incorporated.

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