scholarly journals Combining Knowledge Systems Helps Understand the Spatial Dynamics of Data-Limited Small-Scale Fisheries Systems in Brazil: A Methods Analysis

2021 ◽  
Vol 8 ◽  
Author(s):  
Rebecca Borges ◽  
Indira A. L. Eyzaguirre ◽  
Roberta Sá Leitão Barboza ◽  
Karin Boos ◽  
Marion Glaser ◽  
...  
Keyword(s):  
Carapace Width ◽  
Sustainable Use ◽  
Spatial Dynamics ◽  
Gps Tracking ◽  
Small Scale ◽  
Published Data ◽  
Participatory Mapping ◽  
Small Scale Fisheries ◽  
Mangrove Crab ◽  
Collection Methods

Mangrove habitats provide nursery, shelter, and feeding sites for many economically relevant fish, and invertebrates, such as crabs. Given the highly artisanal character and the patchy spatial distribution of small-scale fishing in mangroves, there is often little data available to inform management, potentially threatening the sustainability of this livelihood-supporting activity. This study assesses the combination of different data collection methods and of including published data in the analysis of the spatial dynamics. We examine crab fisheries in two sustainable-use protected areas as a case study to understand use patterns as indicated by a specific combination of mapping methods. Mangrove crab fishing grounds were mapped by overlaying crab gatherers’ tracked routes with maps produced during participatory-mapping-centered interviews. Information from the literature was used to spatialize crab carapace width and relate it to distance traveled by fishers. Results show that crabs tended to be larger if caught farther from the villages where fishers live. In terms of collection methods, even though GPS tracking is relatively time- and resource-consuming, incorporating some GPS tracking into participatory mapping helps overcome a downside of this type of mapping (e.g., lack of geographical precision) and identifies information that can be accessed through participatory techniques. This highlights the importance of linking different approaches in order to understand small-scale fisheries spatial dynamics.

scholarly journals Kajian Struktur Ukuran Dan Parametr Populasi Kepiting Bakau (Scylla serrata) di Ekosistem Mangrove Teluk Bintan, Kepulauan Riau

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
M. Tahmid, Achmad Fahrudin Dan Yusli Wardiatno
Keyword(s):  
Size Structure ◽  
Growth Parameters ◽  
Carapace Width ◽  
Data Retrieval ◽  
Mangrove Ecosystem ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Small Scale ◽  
Mud Crab ◽  
Mangrove Crab

ABSTRAKKepiting bakau (Scylla serrata) merupakan salah satu potensi komoditas perikanan skala kecil yang memiliki nilai ekonomi tinggi. Kelimpahan populasi dipengaruhi oleh upaya penangkapan dan kondisi ekosistem mangrove sebagai habitat utamanya. Produksi kepiting bakau di Teluk Bintan menurun dan penyebabnya belum diketahui dengan pasti. Oleh karena itu, perlu dilakukan kajian tentang biologi kepiting bakau di Teluk Bintan. Penelitian ini bertujuan untuk mengkaji status populasi kepiting bakau yang meliputi struktur ukuran, parameter pertumbuhan dan laju mortalitas dan eksploitasi. Pengambilan data kepiting bakau dilakukan dengan pendekatan yaitu fisher-based survey. Hasil penelitian menunjukkan ukuran kepiting bakau yang tertangkap mulai dari lebar karapas (CW) 64-172 mm, ukuran fase muda kepiting jantan yang tertangkap mencapai 46,62% dan betina mencapai 48,06%, keduanya hampir setengah dari tangkapan total, ini menunjukkan bahwa alat tangkap yang digunakan belum selektif. CW∞ jantan mencapai 176,93 mm lebih tinggi dari kepiting betina sebesar 169,58 mm, namun sebaliknya nilai koefesien K jantan (0,360) lebih kecil dari betina (0,390), sehingga pertumbuhan kepiting bakau betina lebih cepat dari jantan. Perkiraan angka kematian alami (M) jantan = 0,5566 dan kematian akibat penangkapan (F) jantan = 0,6434 sedangkan M betina = 0,59 dan F betina = 0,41. Laju eksploitasi (E) kepiting jantan mencapai 53,62%, ini dapat dikatakan telah terjadi lebih tangkap atau over eksploitasi. Kata kunci: Scylla serrata, parameter pertumbuhan, struktur ukuran, mangrove and Teluk Bintan ABSTRACTMud crab (Scylla serrata) is one of the potential of small-scale fishery commodities that have high economic value. The abundance of the population is affected by the fishing effort and conditions mangrove ecosystem as its main habitat. Mud crab production in the Gulf of Bintan declined and the cause is not known with certainty. Therefore, it is necessary to study on the biology of mud crab in the Gulf of Bintan. This study aims to assess the status of mangrove crab population that includes the size structure, parameters of growth and the rate of mortality and exploitation. Data retrieval is done with a mangrove crab fisher-based survey. The results showed that the size of mud crab caught from carapace width (CW) 64-172 mm, the size of the young phase male crabs caught females reached 46.62% and reached 48.06%, both are almost half of the total catch, it indicates that fishing gear used is not selective. CW∞ males reach 176.93 mm higher than the female crabs of 169.58 mm, but instead value koefesien K males (0.360) is smaller than females (0.390), so that the growth of female mud crabs faster than males. Estimated natural mortality rates (M) male = 0.5566 and deaths from arrest (F) male = 0.6434 while M females female F = 0.59 and = 0.41. The rate of exploitation (E) male crabs reached 53.62%, can be said to have occurred over fishing or over-exploitation. Keywords: Scylla serrata, growth parameters, structure size, mangrove and bay Bintan

scholarly journals A comparative approach to the Croatian and Montenegrin small-scale fisheries (SSF) in the coastal eastern Adriatic Sea

2017 ◽  
Vol 58 (3) ◽  
pp. 459-480 ◽  
Author(s):  
Sanja Matić-Skoko ◽  
Pero Tutman ◽  
Ana Pešić ◽  
Nika Stagličić ◽  
Olivera Marković ◽  
...  
Keyword(s):  
Fisheries Management ◽  
Adriatic Sea ◽  
Sustainable Use ◽  
Comparative Approach ◽  
Small Scale ◽  
Marine Resources ◽  
Small Scale Fisheries ◽  
Adriatic Coast ◽  
Basic Characteristics ◽  
Future Management

Small-scale fisheries (SSF) in Croatia and Montenegro have a long tradition, similar to those of SSFs in other parts of the coastal Mediterranean. In order to improve fisheries management and save the cultural heritage of fishing traditions on the eastern Adriatic coast, scientists and fisheries managers, from these two countries, made an effort, to gain a better understanding of fishing activities and targeted stocks. This is a complex research topic, due to the high and increasing fishing pressure on marine resources as well as the fact that fisheries management throughout the Mediterranean region remains conventional in its nature. Basic characteristics of SSFs in each country are presented. Specific conclusions related to improvement of coastal resources state in term of sustainable use are suggested together with proposal for additional conservation measures and actively involving fishermen in the management process. Finally, guidelines for future management in terms of monitoring and data collection framework (DCF) are proposed for both countries.

scholarly journals Estimating fishing effort in small-scale fisheries using GPS tracking data and random forests

2021 ◽  
Vol 123 ◽  
pp. 107321
Author(s):  
Faustinato Behivoke ◽  
Marie-Pierre Etienne ◽  
Jérôme Guitton ◽  
Roddy Michel Randriatsara ◽  
Eulalie Ranaivoson ◽  
...  
Keyword(s):  
Random Forests ◽  
Fishing Effort ◽  
Gps Tracking ◽  
Small Scale ◽  
Tracking Data ◽  
Small Scale Fisheries

scholarly journals Size matters: fishing less and yielding more in smaller-scale fisheries

2016 ◽  
Vol 73 (6) ◽  
pp. 1494-1502 ◽  
Author(s):  
Ludmila de Melo Alves Damasio ◽  
Priscila Fabiana Macedo Lopes ◽  
Maria Grazia Pennino ◽  
Adriana Rosa Carvalho ◽  
Ussif Rashid Sumaila
Keyword(s):  
Sustainable Use ◽  
Ecological Factors ◽  
Small Scale ◽  
Ecological Data ◽  
Factors Affecting ◽  
Small Scale Fisheries ◽  
Technological Efficiency ◽  
New Policies ◽  
Social And Environmental Impacts

Abstract Several factors influence catches and the sustainability of fisheries, and such factors might be different depending on the scale on which fisheries work. We investigated the existence of possible subdivisions within small-scale fisheries (SSF) themselves, regarding their economic performance and relative social and environmental impacts to understand which categories of these two types of fleets are best positioned to support sustainability. By doing so, we investigated if it is a good strategy for SSF to aim to grow towards larger scales. We obtained economic and ecological data from landing samplings and information on technological efficiency of this fleet, using a northeastern Brazilian state as a case study. We defined a cut-off point to separate the SSF into two categories of boats, according to their size and gear. We compared their cpue and the factors affecting it within each category; we also compared economic (number of boats, number of landings, jobs, gears, catch, travel time and total time of the fishery, revenues, costs, profits, revenue per unit of effort, and profit per unit of effort) and ecological factors (vulnerability of species caught) between the two categories. We found that small boats spent less time fishing and employed comparatively more people per landed value and catch. The cpue and profits of small boats were also higher. Both large and small boats exploit species with the same overall vulnerability. Therefore, being smaller, even within the SSF category, seems to be a more advantageous social and economic strategy for guaranteeing higher catches and more employment opportunities per catch. These findings need to be taken into account when defining new policies, such as the distribution of subsidies that support or not the sustainable use of fishery resources.

A Cloud Computing Architecture to Map Trawling Activities Using Positioning Data

2019 ◽  
Author(s):  
A. Galdelli ◽  
A. Mancini ◽  
A. N. Tassetti ◽  
C. Ferrà Vega ◽  
E. Armelloni ◽  
...  
Keyword(s):  
Integrated Management ◽  
Low Cost ◽  
Sustainable Use ◽  
Fishing Effort ◽  
Small Scale ◽  
Automatic Identification ◽  
Identification System ◽  
Small Vessels ◽  
Small Scale Fisheries ◽  
Major Development

Abstract Descriptive and spatially-explicit information on fisheries plays a key role for an efficient integrated management of the maritime activities and the sustainable use of marine resources. However, this information is today still hard to obtain and, consequently, is a major issue for implementing Marine Spatial Planning (MSP). Since 2002, the Automatic Identification System (AIS) has been undergoing a major development allowing now for a real time geo-tracking and identification of equipped vessels of more than 15m in length overall (LOA) and, if properly processed, for the production of adequate information for MSP. Such monitoring systems or other low-cost and low-burden solutions are still missing for small vessels (LOA < 12m), whose catches and fishing effort remain spatially unassessed and, hence, unregulated. In this context, we propose an architecture to process vessel tracking data, understand the behaviour of trawling fleets and map related fishing activities. It could be used to process not only AIS data but also positioning data from other low cost systems as IoT sensors that share their position over LoRa and 2G/3G/4G links. Analysis gives back important and verified data (overall accuracy of 92% for trawlers) and opens up development perspectives for monitoring small scale fisheries, helping hence to fill fishery data gaps and obtain a clearer picture of the fishing grounds as a whole.

Dynamics of transboundary governance and management of small scale fisheries on Lake Kariba: implications for sustainable use

2017 ◽  
Vol 74 (3) ◽  
pp. 458-470 ◽  
Author(s):  
K. Nyikahadzoi ◽  
W. Mhlanga ◽  
E. Madzudzo ◽  
I. Tendaupenyu ◽  
E. Silwimba
Keyword(s):  
Sustainable Use ◽  
Small Scale ◽  
Lake Kariba ◽  
Small Scale Fisheries

scholarly journals Spatial Dynamics Modeling of Small-Scale Fishing Fleets With a Random Walk Approach

2021 ◽  
Vol 8 ◽  
Author(s):  
Daniel R. Quijano Quiñones ◽  
Jorge A. López-Rocha ◽  
Isis Hernández-Herrera ◽  
Edgar Torres-Irineo
Keyword(s):  
Random Walk ◽  
Spatial Dynamics ◽  
Fishing Effort ◽  
Conclusive Evidence ◽  
Small Scale ◽  
Dynamics Modeling ◽  
Small Scale Fisheries ◽  
Movement Data ◽  
Fishing Fleets ◽  
Multiple Species

The understanding of fishing effort allocation has been recognized as a key feature within the spatial management planning of fisheries. In small-scale fisheries this assessment is challenging because of their multi-specific context. This has resulted in management regulations that do not fulfill their objectives. Therefore, the analysis of vessels movement is needed for the better assessment and management of small-scale fisheries. Thus, we used a Random Walk (RW) modeling approach to characterize the fishing trips of small-scale multi-gear vessels targeting multiple species. We analyzed activities of three different gears (hand net, handline, longline) and two fishing methods (diving, “gareteo”) recorded with a GPS from 156 fishing trips along three fishing seasons (2018–2020) by the small-scale fleet of Yucatan, Mexico. We fitted seven RW models for the movement data and compared their relative and absolute fit through a delta Akaike test and G-Tests respectively. A total of 143 trajectories showed conclusive evidence to establish a CCRW-type movement; the remaining 13 trajectories fit three models (CCRW, TRW and CRW). The Random Walk models were useful for modeling a multi-gear, small-scale fleet operating in southeast Mexico. According to our results, the Composite Correlated Model was the most suitable RW for this fleet. For future studies, we suggest increasing the number of fishing trips and conducting specific studies by gear and fishing method. Also, the application of relative and absolute fit tests to compare the performance of RW models is highly recommended.

Dysbaric osteonecrosis associated with decompression sickness in a fishing diver

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.

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

2020 ◽  
Vol 12 (5) ◽  
pp. 2026 ◽  
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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