Size selectivity of trammel nets in southern European small-scale fisheries

Of particular concern in commercial fishing catch is 'size bycatch', i.e., the death of early stages of resources that would reach a marketable value when they turn into adults. This event is frequently associated with trawling because of the lower size selectivity of this gear as compared to gillnets. However, this is expected when small-scale fisheries (SSF) employ gillnets simultaneously in setnets + driftnets that mix multiple mesh sizes. This work analyzes fishing captures and compares characteristics of fish catch from gillnets and trawlers with respect to size at first maturation, legal size of capture, and expected discards. Data were obtained from 2007-2021 for SSF in Southern Brazil. A total of 112 fish species were represented in the data. Gillnets exploited fewer species than trawlers; however, most of these constitute fishing resources in the study region. Of the 19 species whose maturation size is known, nine occurred in gillnets as juveniles, and of the 14 species for which the legal size of capture is established, seven occurred in gillnets in prohibited sizes. Gillnets and trawlers presented size bycatch and affected different species between them, with four resources that were present in bycatch from both gillnets and trawlers. The broad range of mesh sizes employed by SSF warns of the discarding of undersized captures, and stresses the importance of policies addressing gillnet management.

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Catch and size selectivity of small-scale fishing gear for the smooth-hound shark Mustelus mustelus (Linnaeus, 1758) (Chondrichthyes: Triakidae) from the Aegean Turkish coast

Mediterranean Marine Science ◽

10.12681/mms.73 ◽

2010 ◽

Vol 11 (2) ◽

pp. 213 ◽

Cited By ~ 8

Author(s):

T. CEYHAN ◽

O. HEPKAFADAR ◽

Z. TOSUNOGLU

Keyword(s):

Mesh Size ◽

Catch Rate ◽

Small Scale ◽

Fishing Gear ◽

Size Selectivity ◽

Small Scale Fisheries ◽

By Catch ◽

Catch Composition

Catch rate, CPUE, biomass ratios and size selectivity from traditional longline and trammel nets of Turkish coastal small-scale fisheries were investigated in order to describe the Smooth-hound shark (Mustelus mustelus) fishery. The SELECT method was used to estimate the selectivity parameters of a variety of models for the trammel nets inner panel of 150 and 170 mm mesh sizes. Catch composition and proportion of the species were significantly different in longline and trammel nets. While mean CPUE of longline was 119.2±14.3 kg/1000 hooks, these values for 150 and 170 mm trammel nets were 5.3±1.2 kg/1000 m of net and 12.7±3.9 kg/1000 m of net, respectively. Biomass ratios of the by catch to Smooth-hound catch were found to be 1:0.32 for 150 mm trammel net, 1:0.65 for longline and 1:0.73 for 170 mm trammel net. The estimated modal lengths and spreads were found to be 91.1 and 16.2 cm for 150 mm and 103.2 and 18.4 cm for 170 mm, respectively. The modal lengths of the species as well as the spread values increased with mesh size.

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The Mobilization of Small Scale Fisheries Community with Knowledge Management for Conservation and Restoration of the Marine and Coastal Resources in the Gulf of Thailand, Songkhla Province

SSRN Electronic Journal ◽

10.2139/ssrn.3546282 ◽

2019 ◽

Author(s):

Sayan Thongsri ◽

Wannee Niamhom ◽

Sunti Srisuantaeng

Keyword(s):

Knowledge Management ◽

Small Scale ◽

Gulf Of Thailand ◽

Coastal Resources ◽

Small Scale Fisheries ◽

The Gulf Of Thailand

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Dysbaric osteonecrosis associated with decompression sickness in a fishing diver

Undersea and Hyperbaric Medicine ◽

10.22462/04.06.2019.17 ◽

2019 ◽

pp. 217-220

Author(s):

Eduardo Briceño-Souza ◽

◽

Nina Méndez-Domínguez ◽

Ricardo j Cárdenas-Dajda ◽

Walter Chin ◽

...

Keyword(s):

Femoral Head ◽

Decompression Sickness ◽

Small Scale ◽

Prior History ◽

Radiological Findings ◽

Small Scale Fisheries ◽

Left Limb ◽

History Of ◽

Decompression Stress ◽

Probable Diagnosis

Diving as a method of fishing is used worldwide in small-scale fisheries. However, one of the main causes of morbidity and mortality among fishermen is decompression sickness (DCS). We report the case of a 46-year-old male fisherman diver who presented with chronic inguinal pain that radiated to the lower left limb. Living and working in a fishing port in Yucatan, he had a prior history of DCS. A diagnosis of avascular necrosis in the left femoral head secondary to DCS was made via analysis of clinical and radiological findings. The necrosis was surgically resolved by a total hip arthroplasty. Dysbaric osteonecrosis is a more probable diagnosis. In this region fishermen undergo significant decompression stress in their daily fishing efforts. Further studies regarding prevalence of dysbaric osteonecrosis among small-scale fisheries divers are needed. In a community where DCS is endemic and has become an epidemic, as of late, the perception of this health risk remains low. Furthermore, training and decompression technique are lacking among the fishing communities.

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Fisheries Sustainability through Soft Multi-Use Maritime Spatial Planning and Local Development Co-Management: Potentials and Challenges in Greece

Sustainability ◽

10.3390/su12052026 ◽

2020 ◽

Vol 12 (5) ◽

pp. 2026 ◽

Cited By ~ 4

Author(s):

Stella Sofia I. Kyvelou ◽

Dimitrios G. Ierapetritis

Keyword(s):

Spatial Planning ◽

Local Development ◽

Small Scale ◽

Artisanal Fisheries ◽

Sustainable Livelihood ◽

Small Scale Fisheries ◽

Island Communities ◽

The Mediterranean ◽

Family Based ◽

Maritime Spatial Planning

Small-scale fisheries in the Mediterranean represent a significant part of the fisheries industry and their substantial social, economic and place attachment related role has always been acknowledged in the region. Despite the fact that this usually family-based endeavor has a vast economic impact on coastal and island communities of the sea-basin, data and insights on the Mediterranean artisanal fisheries continue to be inadequately developed and poorly integrated in the local development strategies. Thus, the aim of this research is two-fold. Firstly, it presents some data and facts on the fisheries sector in the region and secondly it explores the options of their survival, prosperity and sustainability, approaching the combination of fisheries and tourism as a small-scale and soft “multi-use” in the marine space. Greece, with a huge potential in both the fisheries and the tourism sector, was used as focus area where a co-development process was designed aiming to identify advantages/potentials and challenges/disadvantages of the co-existence of artisanal fisheries and tourism, as perceived by a series of stakeholders including the co-management schemes (Fisheries Local Action Groups, FLAGs) in the country. Key conclusion is that sustainable livelihood from small-scale fisheries depends on the correlation between fisheries and other marine activities. Despite some limitations, this can boost sustainable local development and be a unique pattern of a “win-win” and soft multi-use marine spatial planning (MSP), with economic, environmental, social, cultural and governance related benefits for the coastal communities.

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