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Navegando por Assunto "Recursos pesqueiros"

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    Alternativas de manejo pesqueiro no lago da usina hidrelética de Tucuruí/PA
    (Universidade Federal do Pará, 2019-04) ALMEIDA, Neila de Jesus Ribeiro
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    Caracterização socioeconômica da pesca artesanal na Resex Marinha de Araí-Peroba (PA)
    (Universidade Federal do Pará, 2024-08-30) CAVALCANTE, Alessandro dos Santos; JIMENEZ, Érica Kitazono Antunes; http://lattes.cnpq.br/8793273902733669; https://orcid.org/0000-0002-2985-4515; BARBOZA, Roberta Sá Leitão; http://lattes.cnpq.br/9331256487699477; https://orcid.org/0000-0003-2367-553X
    The research conducted in the Araí-Peroba Marine Extractive Reserve in Pará aimed to socioeconomically characterize fishing families, assess their financial resilience, and investigate perceptions of fishery management. Data was collected between March and July 2022 in 11 communities, totaling 293 interviews. Data collection was carried out through the Fish Forever Program, implemented by Rare Brazil, using an electronic form that covered topics such as demographics, livelihoods, fishing, resilience, and social capital. The results indicate that artisanal fishing is the primary source of income, accounting for 74.7% of the total family income, but 42.7% of respondents reported a significant decrease in catch over the past two years. The research revealed that the exclusive dependence on fishing exposes communities to socioeconomic risks, especially in the face of environmental and economic variations. The diversification of income sources is identified as an essential strategy to increase economic resilience. Additionally, the research highlighted the division of labor by gender, with men predominating in catching and women in fish processing. Valuing women's roles and promoting gender equality are fundamental to improving the living conditions of communities. The study also highlighted the importance of social capital, showing that mutual trust and cooperation are crucial for sustainable management practices. It is concluded that an integrated and multidimensional approach that values local knowledge, promotes financial inclusion, and strengthens social capital is essential for the sustainable management of fishery resources in the Araí-Peroba Marine Extractive Reserve.
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    Conflito e enfrentamento diante das mudanças ambientais decorrentes da construção de barragem: memória coletiva e pesca artesanal no Lago da UHE de Tucuruí/PA
    (Universidade Federal do Pará, 2016-04-26) SOUZA, Cleide Lima de; RAVENA CAÑETE, Voyner; http://lattes.cnpq.br/9961199993740323
    This study investigates the artificial lake of the Tucuruí/PA hydroelectric power plant. The main problem is the memory about access and use of fishing resources. Some of the research questions are: does knowledge about the ecosystem prior to the construction of the reservoir allow the confrontation of the local population, that is, the artisan fishermen in relation to the highly modified environment? To what extent knowledge about water resources are incorporated to new knowledge so that different strategies of access and use of fishing resources are created? Which socioenvironmental changes interfere in the collective memory? With these questions in mind, the study aims to identify and analyze collective memory taking into consideration the changes in the natural environment due to the strong impacts of the Tucuruí/PA hydroelectric power plant, in order to identify and analyze the dynamic between the old actors (native) and new (immigrants) and possible scenarios of conflict involving artisanal fishing. The methodology include the choice of 3 of the main fish landing ports (Santa Rosa, Polo Pesqueiro and Porto do Onze) and the use of quanti-qualitative techniques and the application of 80 questionnaires and 50 semi-structured interviews as well as the gathering of documental and bibliographic information prior to the creation of the lake. The theoretical reference refers to society and nature, collective memory and artisanal fishing. The results highlight the dimension of the socioenvironmental impact caused, marked in the collective memory that allows remembering the environment before the construction of the dam (Tocantins river), in the process of confronting the new environment (artificial lake) that allows artisanal fishing in another territory, now (re) constructed by people´s collective memory. The study concludes that the way of living of these fishermen in face of the changes, which involve the transformation of a river into a lake, represents a rupture in their knowledge and in their relation with nature. Collective memory represents an essential tool for continuity, although uncertain, as it links past and present in the reconstruction of a new fishing territory.
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    Diagnóstico da pesca no litoral paraense
    (Universidade Federal do Pará, 2004-02) SILVA, Bianca Bentes da; ISAAC, Victoria Judith; http://lattes.cnpq.br/3696530797888724
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    Dinâmica espaço-temporal da pesca industrial de camarão-rosa Farfantepenaeus subtilis na plataforma continental do Amazonas
    (Universidade Federal do Pará, 2011-05-18) MARTINS, Déborah Elena Galvão; SOUZA FILHO, Pedro Walfir Martins e; http://lattes.cnpq.br/3282736820907252; CAMARGO-ZORRO, Mauricio; http://lattes.cnpq.br/5423657235023988
    Knowledge of spatial distribution of fishing resources is essential to fisheries management. The southern brown shrimp Farfantepenaeus subtilis (Perez-Farfante, 1967) is an industrial fishing fleet target on the Amazon Continental Shelf. This study aimed to evaluate F. subtilis relative abundance spatial-temporal patterns from commercial fishery data, using Geographic Information System tools. Catch per unit effort (CPUE), used as index of relative abundance, was related to bathymetry, substrate characteristics, Amazon river flow and the oceanographic variables obtained by remote sensing: sea surface temperature and chlorophyll-a concentration. Analyzing substrate characteristics, the commercial shrimp trawls were concentrated at the mottled mud region, where the overlap of environmental factors was crucial for a higher incidence of F. subtilis. In this region, features such as substrate (mud), sedimentation rate (<1 cm.yr-1) and salinity (> 30) are the ideal habitat for F. subtilis. Higher CPUE values were associated with lower temperatures and higher values of chlorophyll-a concentration, which occur at the greatest flow of the Amazon river, during the first six months of the year. It was observed the occurrence of three periods with different levels of production along the year: from February to April, with higher CPUE of southern brown shrimp, from May to July, and August to September, with lower CPUE. The results showed that relative abundance of F. subtilis is not distributed uniformly in space nor in seasonal variation.
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    Gestão de recursos pesqueiros na RESEX Mãe Grande de Curuçá: comunidade de Arapiranga de Dentro
    (Universidade Federal do Pará, 2013-03-04) CRUZ, Mariana Neves; RAVENA CAÑETE, Voyner; http://lattes.cnpq.br/9961199993740323
    This issue is about the co- management of the fishery resources in Protected Areas, emphasizing the RESEX Mãe Grande de Curuçá. Through the case of the community of Arapiranga de Dentro, this study aims to analysis how the management of the fishery resources are affected by this kind of government strategy. This study was made by bibliographical survey about the themes: Territory, Artisanal Fishery and Common Uses Resources. The qualitative research was made by Field work, semi – structured questionnaires application. Two sketches and maps were build aims to show the fishery use area of the community of Arapiranga. This study intends to analyze not only the Legal aspect of the protected areas but also how the specific Legislation are absorbed and inserted by the using population and how the local practices of resources extraction are affected by this kind of intermediation relation of the territory – population – resource.
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    Grandes projetos e a relação com os recursos naturais na fronteira amazônica: os acordos de pesca como instrumentos moderadores de conflitos em Limoeiro do Ajuru
    (Instituto Histórico e Geográfico do Pará, 2021-06) RODRIGUES, Suzi Carolina Moraes; CARVALHO, André Cutrim; SILVA, Fernanda Kelly Valente da
    Since the 1960s, the Brazilian Amazon has suffered from several territorial transformations, an immediate result of the process of institutional integration and federalization by the military regime. The impacts caused by this development model, based on large enterprises, fell upon the social environment, directly affecting local populations and traditional peoples, as well as on the environment, by causing a series of irretrievable damage to the region's natural resources. The implementation and operation of these large projects on the frontier of the Brazilian Amazon, however, began to present a territorial dynamic marked by intense conflicts, particularly in the state of Pará. Fishing resources make up a considerable part of natural resources, which were considerably impaired by the large mining and hydroelectric projects, causing pollution of the water bodies, the silting of rivers and a decrease in fishing stocks, considered the main food-economic source of these traditional communities. It is in this perspective that the fisheries agreements emerged, acting as empowering instruments for the fishing communities and conflict moderators in the fishing territories. The fundamental objective of this article, therefore, is to understand how fisheries agreements may act in moderating conflicts over fishing resources, resulting from the implementation of large enterprises, seeking to assess the repercussions of this in the municipality of Limoeiro do Ajuru in the state of Pará. The main conclusion is that the fisheries agreements are capable of acting in the governance of the territory by strengthening a series of actions within the scope of sustainable management of fishing resources and local development in its social, economic and environmental aspects.
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    Manejo comunitário de lagos de várzea e o desenvolvimento sustentável da pesca na Amazônia
    (1998) MCGRATH, David Gibbs; CASTRO, Fábio de; CÂMARA, Evandro; FUTEMMA, Célia
    A várzea amazônica é uma das últimas regiões pesqueiras do mundo ainda pouco explorada (Fig. 1). Contudo, durante os últimos trinta anos a intensificação da pesca tem aumentado a pressão sobre os estoques pesqueiros da várzea (Furtado, 1990; Goulding, 1989; Smith, 1985; Junk, 1984b). Embora a pesca amazônica tenha sofrido grandes mudanças, o desenvolvimento da pesca na região está ainda na sua fase inicial (Bayley & Petrere, 1989). À medida que a pesca se desenvolve, duas estratégias de manejo estão surgindo, uma baseada no modelo convencional de manejo pesqueiro centralizado no Estado, e a outra, no manejo comunitário dos recursos pesqueiros da várzea (McGrath et al. 1993a). Nesse contexto, o desenvolvimento da pesca amazônica representa um problema e uma oportunidade. Peixes são recursos altamente produtivos e renováveis. Se os recursos pesqueiros são manejados de forma sustentável, integrando as populações locais que atualmente exploram os recursos, eles podem contribuir significativamente para o desenvolvimento da várzea. Se o recurso pesqueiro é explorado de forma não sustentável, e sem a participação das populações da várzea, a intensificação da pesca pode levar à degradação dos ecossistemas da várzea e à marginalização da população ribeirinha (McGoodwin 1990, Weber 1994). A proposta deste trabalho é avaliar esses dois modelos de manejo em termos de seus impactos sobre as populações, recursos pesqueiros e ecossistemas de várzea, e avaliar até que ponto o modelo de manejo comunitário poderia servir como base para uma estratégia regional de desenvolvimento dos recursos pesqueiros da várzea. Este trabalho é dividido em três partes. Na primeira, são apresentadas as características mais importantes dos dois modelos. Na segunda parte, é avaliado o potencial de cada modelo para o desenvolvimento da pesca amazônica. Na última seção, são discutidas as principais barreiras para a implementação do modelo de manejo comunitário.
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    Modo de vida e uso dos recursos pesqueiros na localidade do Beiradão, município de Limoeiro do Ajuru, Pará
    (Universidade Federal do Pará, 2020-12-11) SILVA JUNIOR, Davi Martins da; BARBOSA, Wagner Luiz Ramos; http://lattes.cnpq.br/1372405563294070; SILVA, Christian Nunes da; http://lattes.cnpq.br/4284396736118279
    In the general perception of a traditional community, the use of natural resources is understood as unlimited. However, there is a contradiction observed by the riverside residents, regarding the scarcity of their subsistence matter. To mitigate the shortage of this material, the sustainable use of natural resources would be an option to reduce the environmental impacts caused by the poor organization in obtaining these resources. Thus, this work aims to show how the development of fishing activity in the Beiradão Community, in Limoeiro do Ajuru (PA), has taken place, and how fishermen have been organizing themselves, given the scarcity of fishing resources in the region. To this end, bibliographic research was carried out, in addition to field research, in the Beiradão Community, in which structured and semi-structured interviews, observations with photographic records and the application of Social Cartography were used. From the analysis of the data, it was understood that artisanal fishing is the main livelihood of the Community in question, which will have to adapt life and work to the current reality, where the demand for fish directly affects the availability of this resource . However, fishermen demonstrated resistance and limitations, especially with regard to the adoption of Fisheries Agreements, which is made clear in the interviews and even in the literature on artisanal fishing in the region. Thus, it is concluded that fishing in the studied community is of great importance, as a source of income for local residents and as a means of supplying fish to regional municipal headquarters.
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    Pesca artesanal no Parque Nacional do Cabo Orange: contextos de conflito socioambiental e estratégias de manejo alternativo
    (Universidade Federal do Pará, 2014-08-26) RAVENA CAÑETE, Uriens Maximiliano; SANTOS, Sônia Maria Simões Barbosa Magalhães; http://lattes.cnpq.br/2136454393021407
    This work aims to understand and describe how artisanal fishermen, who traditionally exploit the areas surrounding and within a conservation unit, specifically Cabo Orange, National Park, located in the municipality of Oiapoque, coast of Amapá, have ordered politically and environmentally with respect to environmental conflict scenarios in coastal waters - in fishing grounds. Thus, the study uses a qualitative methodology and privileges those involved in the setting of the fishing town of Oiapoque, these are: fishermen of Pará, ICMBio and fishermen of Amapá. The search results show that most of the artisanal fishermen associated with the Fishermen Colony of Oiapoque are remnants of a fishing community that was located inside the Park, call Village Tapereba. The National Parks are a model of conservation unit integral to nature protection, not allowing a human presence or exploitation of its resources. Consequently, this population was expropriated and from the interviews it was possible to see how the artisanal fishermen of Oiapoque, along with the Fishermen Colony of Oiapoque, outlined and proposed a management and a compensatory measure for expropriation has occurred since the creation of that park.
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    Produtividade e rentabilidade da frota artesanal que captura serra, (Scomberomorus brasiliensis, Collette, Russo & Zavalla-Camin, 1978), na costa norte do Brasil
    (Universidade Federal do Pará, 2012-04-25) ESPÍRITO SANTO, Roberto Vilhena do; NAHUM, Victoria Judith Isaac; http://lattes.cnpq.br/3696530797888724
    The fisheries on the Brazil north coast, as well as the S. brasiliensis, has a great economic importance to the local fisheries communities. This resource have a seasonal production variation associated at the changes of the precipitation, with migrations to the northern hemisphere and to the Brazilian Northeast too. Your fishing is shared by many fleets of different Brazilian states and several countries, with no one management policies, for this stock. The Amapá state coast is comparatively more productive than that of Pará and Maranhão, but the fishing on the Pará coastline promotes a better economic return for small boats. Larger boats have a better economic income when their fishing are on the Amapá coast. Financing to a boat acquisition must be accompanied by a trained professional to guiding the fisherman, with a economic and technical information, to straight at a fishing activity with a better financial returns. The middleman, at this time, have a fundamental importance in the serra capture, capitalizing the fishing activity and are the major marketing agents of the production. A change in the economic profile of production and in the marketing chain is required, changing from a disorganized activity, artisanal and unprofitable to the fishermen, to a scale economy with less overhead and greater income. This only will happen with formation of associations and/or cooperatives. The professional training only will increase with the grow of the formal education level, because the education is a limiting factor for the technical learning of fishermen.
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    Os recursos pesqueiros marinhos e estuarinos do Maranhão: biologia, tecnologia, socioeconomia, estado da arte e manejo
    (Universidade Federal do Pará, 2008) ALMEIDA, Zafira da Silva de; NAHUM, Victoria Judith Isaac; http://lattes.cnpq.br/3696530797888724
    The state of Maranhão (Brazil) has considerable fishery potential. However, its fisheries have been excluded from governmental and scientific priorities. Considering the existing lack of knowledge, the aim of the present study was to carry out a survey on past and present available data regarding fisheries in Maranhão, addressing the state of the art; characterization of fishing vessels and gear; and analyzing yield, commercial value and socioeconomic status of the social actors involved. From this portrait, it was possible to delimit the existence of 21 units, heretofore denominated Fishery Production Systems, by means of a process of successive subdivisions of the fishery activity according to the following factors: fleet; practice or fishing gear; resources exploited; environment; residence, work relations and income of the fishermen; and degree of isolation of the fishing area. For such, questionnaires were administrated to different social actors and fieldwork was carried out. The systems were characterized according to economic, social, technological, ecological and management aspects, revealing a broad variety of practices and fleets that predominantly operate in coastal environments, with small vessels and simple gear, catching different target species, especially from the families Scianidae and Aridae. The socioeconomic status of the fishermen is of poverty and abandonment, with a low degree of social organization and low income level as well as precarious housing conditions, low levels of schooling and limited access to healthcare. The market and legislation have provided open access to resources and predatory practices, thereby compromising fishery resources, which are exploited without any concern for sustainability. This demonstrates the insufficiency of management actions. The Rapfish method was employed in an attempt to detect indicators for estimating the state of “health” of the systems, using a set of attributes grouped in five categories: ecology, economy, social aspects, technology and management. The results revealed the following as good indicators: social organization; number of fishermen exploiting the system; level of schooling; use of destructive gear; governmental and traditional management measures. Work relations and income were good criteria for differentiating three tendencies in the goals of the fisheries: subsistence, intermediate and semi-industrial. Some systems stood out a being less sustainable, such as the blue crab collecting, which has declined due to a lack of management, deficient social organization and the commercialization of ovate females; the lobster fishing, which use gear considered destructive. The system involving crabs other than the blue crab is characterized by the existence of traditional management measures and a better management of the resources on the part of government agencies. Thus, the present study allowed the use of a reference system for the analysis and monitoring of the sustainability of regional fisheries, using scientific and/or ethno-knowledge that led to the emergence of management proposals aimed at the fishery management, social organization and environmental education. A case study was also carried out on the production system using mid-sized vessels in the gillnet fishery targeting Cynoscion acoupa in order to give details on one of the production systems. This choice was based on the large catch volumes, large extension of the area of operations throughout the entire coast of the state of Maranhão and the large number of fishermen involved, representing a significant source of income for the state. The case study paid particular attention to the traditional knowledge of the population regarding the use and maintenance of the resource, complemented by studies on the fishery and reproductive biology of Cynoscion acoupa caught in the region of the São Marcos Bay and surrounding areas. Acoupa weakfish catches occurred throughout the year, with harvest at the beginning of the rainy season and a state production estimated at 10,600.00 kg/year. This system has undergone intensive, unorganized exploitation. It can be inferred from the biological characteristics of the species that the increasing fishery effort is not compatible with the capacity of environmental support or the needs of the fishermen. Regarding reproductive parameters, mean length at first sexual maturity (L50) for males was 39.9 cm and slightly higher for females (41.6 cm of total length). The sex proportion was 1:1.4, favoring males. This species completes its entire life cycle within the study area; reproduction occurs throughout the year, with two spawning peaks – one in November/December and another in March/May. It is believed that the information gathered can contribute toward the drafting of better sustainability proposals and actions regarding this fishery by combining ethnoknowledge and scientific knowledge on this system.
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    A relação trabalho e educação no contexto dos acordos de pesca em Cametá/PA: uma alternativa econômica ou uma prática de resistência?
    (Universidade Federal do Pará, 2013-06-28) BARRA, José Domingos Fernandes; SILVA, Gilmar Pereira da; http://lattes.cnpq.br/7624395840820523
    From the relationship between Labor Education established within a community of fishermen in the município of Cametá, are analyzed fisheries agreements, while strategic ways to manage fish stocks in rivers and gifts for daily routine these workers. Thus we seek the voice of these subjects (fishermen) to identify the problems, difficulties and gains on these agreements, but also how these documents are capable of inciting mechanisms of collective organization, through the co-management of fisheries resources among residents of communities where the research is performed. Initially seeking his own recognition, then recognition as category, while social class, subjects studied fishermen are in the process of setting up either in their struggle inserted individually or in social movements. We aim thus to grasp the importance of his work and how it is steeped in their knowledge and in their economic and/or organizational practices. Similarly, starting from conceptions to describe logical community that are around ways to access and perform maintenance and management of its spaces, which we want to understand the fundamentals that enable shared use of fishery resources.
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    Saberes da pesca em unidade de conservação: os pescadores da RDS Alcobaça no Lago da Usina Hidrelétrica de Tucuruí/PA
    (Universidade Federal do Pará, 2016-09-26) ALMEIDA, Neila de Jesus Ribeiro; RAVENA CAÑETE, Voyner; http://lattes.cnpq.br/9961199993740323
    This thesis deals the relationship between human beings and the environment Conservation Unit (CU). It uses, as an analytical tool, the approaches of traditional knowledge applied to the fishing population in the lake of the Tucuruí Hydroelectric Plant in the state of Pará. The work deals specifically with the fishermen everyday in the Alcobaça Sustainable Development Reserve who residing in the area after reservoir formation. The thesis analyzes how, on the fluctuation of reservoir waters originate in human action (open and close the gates of UHT), knowledge and practices of the RDS Alcobaça fishermen define, redefine and redesign in the process of access and use of fisheries resources . Search also understand and describe the various forms of interactions of the fishing population with the environment. The research methodology made use of a qualitative approach based on direct observation procedures and survey from semi-structured informal interviews. The paper concludes that fishermen can adapt the artificial environment from the redefinition of their traditional knowledge built and forged in natural environments and that even in the face of strong changes created in the Lake environment and the pressures of management of UC, the population of Alcobaça reservation can readjust their knowledge to develop their skills in fishing.
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    Temporal patterns in the occurrence of selected tropical fishes in mangrove creeks: implications for the fisheries management in north Brazil
    (2009-06) GIARRIZZO, Tommaso; KRUMME, Uwe
    To examine the temporal patterns in the occurrence of a tropical ichthyofauna, fisheries-independent samples were collected between September 2003 and July 2004 from intertidal mangrove creeks in the Curuçá estuary, Pará, north Brazil. Juveniles occurred year-round with the most intense occurrence during the wet/dry transition season (Anchovia clupeoides, Cetengraulis edentulus, Rhinosardinia amazonica, Mugil sp.). The occurrence of Colomesus psittacus and Anchoa hepsetus was continuous. Sciades herzbergii displayed two peaks (wet and dry season) while Cathorops sp. peaked only in the wet season. The continuous presence of juveniles in the tropical mangroves suggested that the fisheries management should be based on large no-take areas rather than closed seasons.
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    Território e territorialidade de pescadores nas localidades Céu e Cajuúna Soure-PA
    (Universidade Federal do Pará, 2009-04-20) GUEDES, Eneias Barbosa; PIMENTEL, Márcia; http://lattes.cnpq.br/3994635795557609; PALHETA, João Márcio; http://lattes.cnpq.br/5356047514671129
    The study presents the discussion on the issue of fishing in areas of Céu and Cajuúna in the city of Soure. These areas are located in micro-region of the Ararí mesoregion of Marajó- Pará. The fishery is developed in the rural context of the Amazonian territorial scope. Fishing is the result of the interaction of components: Seasonality environmental, natural resources and fishing capacity of the region. It is worth highlighting the territorial dimension of fishing for fishermen to understand their concepts of territorys and territorialitys. The fishermen of the areas of Cajuúna and Céu have the centrality of their living space and reproduction in fishing activity, and the rural villages of fishermen are expressions of the power of local collectivities. In this work, is questioned how the Geographical Science understand the ownership, domain, and use of space by fishermen. For this, we tried to understand, through research, the actions of different social actors involved in the problems addressed. At this point, we tried to understand the meaning of the territoriality of local fishermen, their relationship with nature, and their work organization in order to obtain a better visibility of the territories of fishermen. These territories are defined and appropriated to the aquatic environment and its configuration is inaccurate. "Possession" of these territories is vast and very fluid, due to seasonal dynamic of water and fish. For fishermen, fishing is more than one activity, because it involves a complexity of relationships and phenomena, between man and nature, which has influence on the forms of social organizations of these groups. The techniques of production of the fishermen are part of their cultural complex of ownership and appropriation of nature. These techniques define elements of life in the processes of territorialization and construction of the identity of the fisherman.
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    Variação diária e caracterização morfológica das larvas de peixes do complexo estuarino do Rio Amazonas - PA
    (Universidade Federal do Pará, 2009) ZACARDI, Diego Maia; NAKAYAMA, Luiza; http://lattes.cnpq.br/3771896759209007
    The great importance of fishery resource for Amazonia, together with the necessity of more detailed basic information on identification of fish larvae (captured in their natural environment) justify the development of this study, which has the aim of expanding the knowledge about ichthyoplankton, relating it to diel variation tendency and tides from the estuarine complex of Amazonas river, PA. The material was collected during diurnal and nocturnal periods, in the second semester of 2007, by the PIATAM mar II project, under the subarea 1 (estuary of Paracauari river) and subarea 2 (Guajara Bay) in the tide sizigia and quadrature, in horizontal trawls the water column surface cylindrical-conical plankton 300μm mesh. The samples were maintained in recipients containing 4% formalin. Hydrologic factors were obtained in situ by the Chemical Oceanography Group of the Museum of Paraense Emilio Goeld, and were sorted and identified through on morphological, morphometric and meristic characteristics based on the development regressive sequence technique and specialized bibliography. The main structures and characteristics of the initial phases of fishes were described and illustrated, facilitating future studies focusing ichthyoplankton of the region. Superficial temperature of the water, hydrogenionic potential and dissolved oxygen did not show significant differences in the areas studied. The values of salinity did not show significant differences in relation to seasons of sampling and tides, registering only horizontal variation with the gradual increase in direction of the mouth river with high (12) and minimum (0) values to subareas 1 and 2, respectively. The highest densities of eggs were registered in subarea 1 in comparison with subarea 2. Moreover, highest densities of eggs were observed during diurnal period (163, 29 eggs/100m³), while in subarea 2 they were observed during nocturnal period (19,70 eggs/100m³). Larvae were distributed in 22 taxa representing 13 families and 21 species. The predominant taxa were: P. flavipinnis (46,29%), R. amazonica (19,75%), Engraulidae (10,70%), P. squamosissimus (7,55%), A. lineatus (5,19%), O. saurus (3,30%) and Gobiosoma sp. (2,15%), with a relative high participation of Clupeiformes (76,75%). When considering the development stage, it was observed a higher abundance of pre-flexion larvae in both subareas, while the stages yolk-sac and pos-flexion were less observed. Nocturnal period showed the highest density of larvae and number of taxa, evidencing a possible nictemeral migration of the plankton. Only M. furnieri showed significantly higher abundances in diurnal samples. The great majority of taxa did not present significant differences between diurnal and nocturnal samples. Hence, the density of larvae and number of taxa differ between diurnal and nocturnal periods and between tides. As a consequence, the morphologic characteristic described in this study allow an adequate identification of larvae, amplifying the biologic knowledge of the estuarine species from Para coast, considering that this information is still scarce and there is a necessity of intensification in this kind of research. Moreover, the comprehension of the ecology of the organisms, especially the ones which have life cycles associated to estuaries and the variations in the transport of larvae between diurnal and nocturnal periods, as well as between tides. These are fundamental topics to improve the management and conservation of these renewable resources.
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