Length based data of Nemipterus japonicus to spawning potential ratio (SPR) estimation on small scale fisheries (SSF) management in Sunda Strait

Abstract Large scombrids, commercial tuna species, are regularly assessed and managed. However, most of the small scombrids, many mackerels and bonitos, lack accurate catch data to implement traditional stock assessments despite their economic importance in many small-scale fisheries. In this study, we analysed different approaches using length composition data from multiple fleets with different gear selectivity to assess small scombrids in the Atlantic Ocean. Using simulated populations, we compared two length-based methods (length-based spawning potential ratio and length-based integrated mixed effects ), under different length data grouping scenarios. We found that using length data from the fleet targeting the broadest range of sizes resulted in the lowest bias in spawning potential ratio of all options tested. Based on these results, we used biological and length data to estimate a quantitative proxy of current stock status for ten small scombrid stocks in the Atlantic Ocean. We found that some stocks are likely to be overfished, such as little tunny (Euthynnus alletteratus) in the Southeast Atlantic and wahoo (Acanthocybium solandri) in the Northwest Atlantic. This is a starting point in the estimation of stock status for these species, but should not be thought of as a replacement for other more data-intensive assessments.

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Comparing performance of catch-based and length-based stock assessment methods in data-limited fisheries

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2019-0276 ◽

2020 ◽

Vol 77 (6) ◽

pp. 1026-1037 ◽

Cited By ~ 2

Author(s):

Maite Pons ◽

Jason M. Cope ◽

Laurence T. Kell

Keyword(s):

Closed Loop ◽

Stock Assessment ◽

Maximum Sustainable Yield ◽

Assessment Methods ◽

Small Scale ◽

Small Scale Fisheries ◽

Management Procedures ◽

Spawning Potential Ratio ◽

The Common ◽

The One

The quantity of data from many small-scale fisheries is insufficient to allow for the application of conventional assessment methods. Even though in many countries they are moving to closed-loop simulations to assess the performance of different management procedures in data-limited situations, managers in most developing countries are still demanding information on stock status. In this study we use the common metric of harvest rate to evaluate and compare the performance of the following catch-only and length-only assessment models: catch – maximum sustainable yield (Catch-MSY), depletion-based stock reduction analysis (DBSRA), simple Stock Synthesis (SSS), an extension of Catch-MSY (CMSY), length-based spawning potential ratio (LBSPR), length-based integrated mixed effects (LIME), and length-based Bayesian (LBB). In general, results were more biased for slightly depleted than for highly depleted stocks and for long-lived than for short-lived species. Length-based models, such as LIME, performed as well as catch-based methods in many scenarios, and among the catch-based models, the one with the best performance was SSS followed by CMSY.

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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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