scholarly journals Juveniles and undersized fish in small-scale fisheries: gillnets are not less implied than trawling

2021 ◽  
Vol 35 (2) ◽  
Author(s):  
Paulo De Tarso da Cunha Chaves
Keyword(s):  
Fish Species ◽  
Small Scale ◽  
Commercial Fishing ◽  
Southern Brazil ◽  
Size Selectivity ◽  
Study Region ◽  
Small Scale Fisheries ◽  
Fish Catch ◽  
Fishing Resources ◽  
Lower Size

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.

scholarly journals PeskAAS: A near-real-time, open-source monitoring and analytics system for small-scale fisheries

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0234760
Author(s):  
Alexander Tilley ◽  
Joctan Dos Reis Lopes ◽  
Shaun P. Wilkinson
Keyword(s):  
Open Source ◽  
Source Monitoring ◽  
R Package ◽  
Small Island ◽  
Small Scale ◽  
Small Scale Fisheries ◽  
Fish Catch ◽  
Catch Rates ◽  
Context Specific ◽  
Species Specific

Small-scale fisheries are responsible for landing half of the world’s fish catch, yet there are very sparse data on these fishing activities and associated fisheries production in time and space. Fisheries-dependent data underpin scientific guidance of management and conservation of fisheries systems, but it is inherently difficult to generate robust and comprehensive data for small-scale fisheries, particularly given their dispersed and diverse nature. In tackling this challenge, we use open source software components including the Shiny R package to build PeskAAS; an adaptable and scalable digital application that enables the collation, classification, analysis and visualisation of small-scale fisheries catch and effort data. We piloted and refined this system in Timor-Leste; a small island developing nation. The features that make PeskAAS fit for purpose are that it is: (i) fully open-source and free to use (ii) component-based, flexible and able to integrate vessel tracking data with catch records; (iii) able to perform spatial and temporal filtering of fishing productivity by fishing method and habitat; (iv) integrated with species-specific length-weight parameters from FishBase; (v) controlled through a click-button dashboard, that was co-designed with fisheries scientists and government managers, that enables easy to read data summaries and interpretation of context-specific fisheries data. With limited training and code adaptation, the PeskAAS workflow has been used as a framework on which to build and adapt systematic, standardised data collection for small-scale fisheries in other contexts. Automated analytics of these data can provide fishers, managers and researchers with insights into a fisher’s experience of fishing efforts, fisheries status, catch rates, economic efficiency and geographic preferences and limits that can potentially guide management and livelihood investments.

Length–weight relationships of 12 marine fish species from the Pacific coast of Guatemala associated with small‐scale fisheries

2020 ◽  
Vol 36 (6) ◽  
pp. 863-865
Author(s):  
Juan Carlos Hernández‐Padilla ◽  
Norberto Capetillo‐Piñar ◽  
Fernando Aranceta‐Garza ◽  
Josué Alonso Yee‐Duarte ◽  
Nurenskaya Vélez‐Arellano ◽  
...  
Keyword(s):  
Marine Fish ◽  
Fish Species ◽  
Pacific Coast ◽  
Small Scale ◽  
Marine Fish Species ◽  
Small Scale Fisheries ◽  
The Pacific

Mapping Concepts with Fisherfolk

2010 ◽  
pp. 301-315
Author(s):  
Denis Hellebrandt
Keyword(s):  
Collaborative Learning ◽  
Complex Systems ◽  
Concept Mapping ◽  
Small Scale ◽  
Southern Brazil ◽  
Research Projects ◽  
Small Scale Fisheries ◽  
Conceptual Background ◽  
Accessible Format

This chapter aims to show how concept mapping is a technique which is capable of representing complex systems in an accessible format and offers excellent opportunities for collaboration and meaningful learning. Effective communication is at the foundation of collaborative learning and concept mapping is expressly used in this research to facilitate the dialogue between participants and researcher. The chapter starts out by situating the reader by way of a conceptual background about complex systems, followed by the basis for the application of concept mapping in this project and the specific research context - a case study of small-scale fisheries in southern Brazil. Then, an account of the use of concept mapping during the fieldwork is given, with an assessment of the technique. The chapter ends with a reflection on the experience gained so far and comments on the application of collaborative learning in similar research projects.

scholarly journals Occurrence of larvae of trypanorhynch cestodes in snappers (Lutjanidae) from northeast Brazil

2018 ◽  
Author(s):  
André Mota Alves ◽  
Geza Thais Rangel e Souza ◽  
Ricardo Massato Takemoto ◽  
Luiz Eduardo Roland Tavares ◽  
Cláudia Moura de Melo ◽  
...  
Keyword(s):  
Fish Species ◽  
Food Product ◽  
Small Scale ◽  
Zoonotic Potential ◽  
Northeast Brazil ◽  
Small Scale Fisheries ◽  
Body Of Knowledge ◽  
New Findings ◽  
Heavy Loads ◽  
Northeast Coast

Abstract Three species of snappers from artisanal, small-scale fisheries were examined for the presence of parasites. A total of 139 lutjanid fish were collected: 69 specimens of Lutjanus analis, 47 specimens of Lutjanus vivanus, and 23 specimens of Lutjanus synagris. Encysted plerocercoid of trypanorhynch cestodes found at necropsy in the viscera of snappers were sampled for parasitological analysis. These plerocercoid larvae belong to the genera Floriceps, Pseudogrillotia , and Oncomegas. Although these parasites do not have any zoonotic potential, fish with heavy loads of plerocercoids are rejected during inspection as they compromise meat hygiene. Our findings suggest that light larval cestode infections in lutjanids would not lead to consumer rejection of the food product. The occurrence of Floriceps sp. in L. analis and in L. synagris, of Pseudogrillotia sp. in L. vivanus and in L. synagris , and of Oncomegas sp. in L. synagris are new findings in these fish species. These parasites are new to these fish species and have not been reported in snappers from the northeast coast of Brazil. The results contribute to the existing body of knowledge about the parasitic fauna of fish and its distribution along the coastline of Brazil.

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

2006 ◽  
Vol 79 (1-2) ◽  
pp. 183-201 ◽  
Author(s):  
Karim Erzini ◽  
Jorge M.S. Gonçalves ◽  
Luís Bentes ◽  
Dimitrios K. Moutopoulos ◽  
Jose A. Hernando Casal ◽  
...  
Keyword(s):  
Small Scale ◽  
Size Selectivity ◽  
Small Scale Fisheries

scholarly journals FISHING ACTIVITIES AND FISHERMEN INCOME IN RANAU LAKE, SOUTH SUMATRA

2015 ◽  
Vol 21 (1) ◽  
pp. 19
Author(s):  
Dina Muthmainah ◽  
Subagdja Subagdja ◽  
Makri Makri ◽  
Dwi Atminarso ◽  
Safran Makmur
Keyword(s):  
Field Survey ◽  
Small Scale ◽  
Fishing Activity ◽  
Fish Yield ◽  
Field Surveys ◽  
Small Scale Fisheries ◽  
Fish Resources ◽  
Fish Catch ◽  
Catch Composition ◽  
Economical Parameter

Fish resources contribute to the socio-economic development for people who live surrounding the waters. The fishermen of Ranau Lake, South Ogan Komering Ulu Regency, South Sumatra Province and West Lampung Regency, Lampung Province are the prime stakeholder and direct interest in fish resources, because they depend on it for their livelihoods or they are directly involved in its exploitation in some ways. However, to well manage these resources, it needs data and information about fish utilization and fishing activity. The objectives of this work are to assess fishing activities such as the fishing craft and gears, catch composition, fish yield, catch per unit of effort (CPUE) and to estimate the fihermen income with economical parameter such as cost and price. Field surveys were conducted from February to November 2014. Fishing activities data were collected from field survey and interview. The results showed that fish resources utilization in Ranau Lake was categorized as traditional and small scale fisheries using different selective fishing gears such gillnet, harpoon, net trap and basket trap with the fish catch in average of 696.66 g/day; 205.03 g/day; 1.584.06 g/day and 123.67 g/day, respectively. Fisherman income (IDR 2,163,300) means the fishermen in Ranau Lake reach standard Indonesian welfare.

scholarly journals THE PROVISION ON SEAGRASS ECOSYSTEM SERVICES TO SMALL-SCALE FISHERIES ACTIVITY IN EASTERN COASTAL OF BINTAN ISLAND, RIAU ISLANDS

2018 ◽  
Vol 2 (1) ◽  
pp. 29-40
Author(s):  
M. Nur Arkham
Keyword(s):  
Ecosystem Services ◽  
Fish Species ◽  
Stable Condition ◽  
Small Scale ◽  
Fish Community Structure ◽  
Small Scale Fisheries ◽  
Seagrass Ecosystem ◽  
Catchment Areas ◽  
Study Sites ◽  
Index Value

The seagrass ecosystem has the same role as other ecosystem in improving coastal community fishery business. The purpose of this study is to assess the provision of seagrass ecosystem services to small fishing activities in the study sites. The research was conducted in Malang Village Meeting and Berakit from September to November 2014. Spatial distribution of fish species resources and small fishing catchment areas at study sites were located near the coast in each study village. The activity of catching small fishermen by utilizing the existence of seagrass ecosystem is reflected from the resources of fish species that are obtained and marketed to meet their needs. Fish community structure associated with seagrass from small fisherman catch in Malang Village Meeting based on index value of diversity (H ') and uniformity (E) of 2.58 and 0.93 higher than that of Desa Berakit that is 1.77 and 0.65. This value indicates that the keaganagaman in Malang Village is Medium and the community is in stable condition. While in the village of Berakit shows low diversity and community in unstable conditions. While the value of dominance index (C) of each village is low with the value of each village of 0.09 and 0.31. Keywords: seagrass ecosystem services, small-scale fisheries, and Eastern Coastal of Bintan

scholarly journals Fish catch composition of selected small scale fishing gears used in the Bonny River, Rivers State, Nigeria

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Olaniyi Alaba Olopade ◽  
Nkuene Gbenekanu Sinclair ◽  
Henry Dienye
Keyword(s):  
Fish Species ◽  
Small Scale ◽  
Wet Season ◽  
Gill Net ◽  
Long Line ◽  
Significant Difference ◽  
Fishing Gears ◽  
Fish Catch ◽  
Catch Composition ◽  
Rivers State

Fish catch composition of some selected small scale fishing gears (gill net, cast net, beach seine and long line) were investigated in Bonny River, Rivers State, Nigeria from August 2014 to January 2015. A total number of 25 fish species from 18 families were recorded during the study. The Mugilidae with only one species constituted the dominant family while Cichlidae, Lutjanidae, Clupeidae, had three species and Scianidae had two species of fish caught and the remaining families had one species each. Mugil cephalus constituted 28.48% of the total catches followed by C. nigrodigitatus (22.48%). In the dry season M. cephalus forms the major component landings (32.65%), followed by C. nigrodigitatus (26.53%) and S. galilaeus (12.24%) while in the wet season M. cephalus (31.06%), C. nigrodigitatus (18.63%) and T. zillii (11.80%) were the dominant fish species. Cast net was the most efficient fishing gear while gill net was the least efficient. The comparison analysis between the wet and dry seasons using t-test showed no significant difference between dry and wet seasons (t = 0.092, P > 0.05).

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