Characterization of queen conch (Aliger gigas) artisanal fishing prior to and after the five-year ban at Chinchorro Bank Biosphere Reserve, Mexico

2021 ◽  
pp. 102074
Author(s):  
Miguel Mateo Sabido-Itzá ◽  
Carmen Amelia Villegas-Sánchez ◽  
Martha Beatriz Hernández-Millán ◽  
Alejandro Medina-Quej ◽  
María del Carmen García-Rivas ◽  
...  
2017 ◽  
Vol 49 (2) ◽  
pp. 92
Author(s):  
Glória Cristina Cornélio Do Nascimento ◽  
Eduardo Beltrão de Lucena Córdula ◽  
Reinaldo Farias Paiva De Lucena ◽  
Ricardo De Souza Rosa ◽  
José Da Silva Mourão

Estratégias tradicionais de pesca são utilizadas por comunidades de pescadores em todo o mundo, dentre elas os “currais”, que são armadilhas fixas construídas na zona costeira. O objetivo do presente estudo foi caracterizar e descrever as formas de manejo destes “currais” pelos pescadores do litoral da Paraíba. Foram utilizadas entrevistas livres, “rapport”,“Snow ball” e formulário semiestruturado nas visitas mensais aos cinco “currais” entre os meses de novembro 2012 até março de 2013. Foi quantificada a produção dos currais e identificada as espécies mais capturadas. Os dados mostraram que estas armadilhas são constituídas por compartimentos e passam por fases em terra e mar até serem totalmente ativadas. O total da produção de peixes foi de 303 kg. As espécies predominantes foram: Mugil curema and Mugil liza, Trichiurus lepturus, Caranx hippos, Selene vomer, Selene setapinnis, Diapterus auratus e Diapterus rhombeus. Conclui-se que este tipo de pesca é utilizado há décadas no litoral da Paraíba, demonstrando existir manejo e técnicas próprias com relações de trabalhos inerentes a este tipo de armadilha.


Hydrobiologia ◽  
2020 ◽  
Vol 847 (19) ◽  
pp. 4141-4142
Author(s):  
Graciela García ◽  
Verónica Gutiérrez ◽  
Néstor Ríos ◽  
Nicolás Papa ◽  
Sebastián Serra ◽  
...  

2016 ◽  
Author(s):  
Nathan K Truelove ◽  
Loong Fai Ho ◽  
Richard F Preziosi ◽  
Stephen J. Box

We report the development and characterization of 13 novel microsatellite loci for the Caribbean queen conch, Lobatus gigas, an ecologically and commercially important marine gastropod. Paired-end sequencing was carried out on genomic DNA from a single queen conch using half a flow cell lane of an Illumina MiSeq. A total of 48 potentially amplifiable loci containing microsatellites were tested on 45 individuals from the Florida Keys and Bahamas. In total, 13 consistently amplifying and polymorphic microsatellite loci were identified. The number of alleles ranged from 4 to 26 and observed heterozygosities ranged from 0.340 to 1.00. There was no evidence of scoring error, large allele dropout, or evidence of linkage disequilibrium at any locus. Four loci deviated from Hardy-Weinberg equilibrium due to moderate levels of null alleles (null allele frequencies ranged from 0.081 to 0.230). Although null alleles were detected at four microsatellite loci, the high levels of polymorphism and moderate null allele frequencies suggest that these 13 novel microsatellite markers will be useful for researchers carrying out conservation genetic studies of L. gigas.


2020 ◽  
Vol 7 ◽  
Author(s):  
Néstor E. Ardila ◽  
Hernando Hernández ◽  
Astrid Muñoz-Ortiz ◽  
Óscar J. Ramos ◽  
Erick Castro ◽  
...  

2020 ◽  
Vol 14 (2) ◽  
pp. 333-352
Author(s):  
Byll O. Kperou Gado ◽  
Ismaïla Toko Imorou ◽  
Ousséni Arouna ◽  
Madjidou Oumorou

La caractérisation des parcours naturels est un enjeu majeur pour protéger ces derniers et maintenir la productivité des systèmes d’élevage  pastoraux. Cette recherche a été réalisée à la périphérie de la réserve de biosphère transfrontalière du W du Bénin. Le but est de mieux connaître  les écosystèmes pâturés autour de la réserve et d’analyser la perception des éleveurs transhumants sur ces pâturages. Les approches phytosociologique et socio-économique ont été utilisées. Au total 225 personnes ont été interrogées. Les résultats ont révélé 132 espèces végétales réparties en 93 genres et 41 familles sur des pâturages à Spermacoce radiata et Anogeissus leiocarpa, Kyllinga squamulata et Diospyros  mespiliformis, Alysicarpus glumaceus et Detarium microcarpum, Paspalum scrobiculatum et Prosopis africana. Le choix de cette zone par les transhumants nationaux et sahéliens est lié à la bonne valeur pastorale (52,79% dans les pâturages à Paspalum crobiculatum et Prosopis africana), la richesse en essences fourragères riches en énergie (Poaceae) et en protéines (Leguminosae et Rubiaceae). La zone est soumise à de fortes pressions anthropiques qui engendrent des difficultés d’alimentation du bétail. Les éleveurs utilisent ainsi leurs savoirs sur les ressources  fourragères pour s’adapter. Ils connaissent bien celles qui sont les plus appétées par les animaux et celles devenues rares ou en voie de disparition. Mots clés : Phytosociologie, perception, valeur pastorale, embroussaillement.   English Title:Characterization of the transhumance route at the periphery of the transboundary biosphere reserve in W Benin The characterization of natural rangelands is a major challenge to protect them and maintain the productivity of pastoral livestock systems. This research was carried out on the outskirts of the W B. transboundary biosphere reserve in Benin. The aim was to have a better understanding of the  grazed ecosystems around the reserve and to analyze the perception of transhumant pastoralists on these pastures. Phytosociological and socio-economic approaches were used. A total of 225 people were interviewed. The results revealed 132 plants species divided into 93 genera and 41  families on pastures with Spermacoce radiata and Anogeissus leiocarpa, Kyllinga squamulata and Diospyros mespiliformis, Alysicarpus glumaceus and Detarium microcarpum, Paspalum scrobiculatum and Prosopis africana. The choice of this area by national and Sahelian transhumants is linked to the good pastoral value (52.79% in pastures with Paspalum scrobiculatum and Prosopis africana), the richness in fodder species rich in energy (Poaceae) and proteins (Leguminosae and Rubiaceae). The area is subject to strong anthropogenic pressures which cause difficulties in feeding livestock. Breeders use their knowledge of fodder resources to adapt. They are familiar with those that are the most palatable by animals and those that have become rare or endangered. Keywords: Phytosociology, perception, pastoral value, encroachment.


2021 ◽  
Vol 31 (2) ◽  
Author(s):  
Rogério Barroso Souza ◽  
Jonatas da Silva Castro ◽  
Rayssa de Lima Cardoso ◽  
Thiago Campos de Santana ◽  
Erivânia Gomes Teixeira

No litoral ocidental maranhense a pesca apresenta grande relevância social e econômica. Neste artigo objetivou-se caracterizar a pesca artesanal do município de Carutapera (Maranhão, Brasil), realizando aplicações de 50 questionários, voltados ao entendimento sobre o perfil socioeconômico dos pescadores e pescadoras, das estruturas de pesca e da comercialização do pescado. Os resultados revelaram que 70% eram do gênero masculino com média de idade de 43 anos. No que concerne ao nível de escolaridade dos pescadores e pescadoras entrevistados, 36% relataram ter ensino fundamental completo, dos quais 28% iniciaram o ensino médio e não terminaram; e 36% possuíam apenas o ensino fundamental incompleto. O índice de analfabetos foi de apenas 2%. A pesca era praticada com exclusividade por 52% deles, enquanto outros exerciam atividades como: construção civil (27%), conserto de redes de pesca (13%), agricultura (6%) e carpintaria (2%). Em relação à naturalidade, 60% eram naturais do estado do Maranhão e 40% do estado do Pará. O apetrecho de pesca mais utilizado nas capturas foi a rede de emalhar (24%) e os menos utilizados a zangaria (2%) e a faca (2%), esse último usado principalmente para a remoção de ostras. Quanto ao tipo de embarcação, a maioria dos pescadores e pescadoras artesanais faziam uso de canoas motorizadas e barcos de pequeno porte a motor, com comprimento variando de 8 metros a 11 metros. Entre as espécies mais capturadas está a pescada amarela (Cynoscion acoupa), espécie que tem um alto valor comercial, porém outras como a cururuca (Micropogonias furnieri) e peixe-pedra (Genyatremus luteus) são espécies capturadas durante todo o ano com boa produção. Um dos grandes problemas relatados é a falta de estrutura organizacional, evidenciando o descaso que se encontra a pesca artesanal no município.AbstractIn western coast of Maranhão, fishing has great social and economic relevance. In this article, aimed to characterize the artisanal fishing in the municipality of Carutapera (Maranhão, Brazil), using 50 questionnaires to understand the socioeconomic profile of fishermen and fisherwomen, fishing structures and fish trade. The results showed that 70% where male with an average age of 43 years. Regarding education level, 36% reported having completed elementary school, of which 28% started high school but did not complete it; and 36% had only incomplete primary education. The illiteracy rate was 2%. Fishing was practiced exclusively by 52% of them, while others had activities such as: civil construction (27%), repairing fishing nets (13%), agriculture (6%) and carpentry (2%). Regarding naturalness, 60% were from Maranhão state and 40% were from Pará state. The most used fishing tackle in the catches was the gill net (24%) and the least used were the zangraria (2%) and the knife (2%), the latter mainly used for the removal of oysters. Regarding type of vessel, most fishermen and fisherwomen used motorized canoes and small motor boats, with a length ranging from 8 meters to 11 meters. Among the most caught species is acoupa weakfish (Cynoscion acoupa), a species that has a high commercial value, but others such as whitemouth croaker (Micropogonias furnieri) and torroto grunt (Genyatremus luteus) are species captured throughout the year with suitable production. One of the major problems reported is the lack of organizational structure, showing the neglect of artisanal fishing in the municipality. 


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