DSpace Coleção: Mestrado

Desvendando o comércio de peixes no nordeste paraense.

Tue, 15 Jul 2025 00:00:00 GMT

Título: Desvendando o comércio de peixes no nordeste paraense. Autor(es): FARIAS, Tiago Sousa de Abstract: The Brazilian Amazon Coast (LAB) has a high biodiversity of aquatic organisms, especially fish. Local fishing activity has an impact on aquatic resources, whether they are targeted by fishing methods (accompanying fauna), and is a global threat to species, especially those threatened with extinction, such as sharks and rays. Even though fish are a nutritionally, economically, and culturally important resource for the Brazilian Amazon, there is a recurring lack of data on the catch and composition of the species sold. Especially in cases where a) more than one species is sold under a single popular name; b) the fish species have high morphological similarity; c) the fish have low commercial value; and d) the fish are sold uncharacterized (without heads, fins, etc.) in the markets, which creates difficulties in identifying and measuring them. The research problem lies in the lack of data on the dynamics of fish marketing in the fish markets of Bragança, Capanema, Castanhal, Salinópolis, and São João de Pirabas. Due to the recurring lack of data on these bycatches, a scientometric survey carried out on the Scopus, Scielo, Web of Science and Google Scholar databases on the shark and ray bycatch fauna resulted in 28 scientific articles published in 21 joumals. We list 28 species of sharks and 14 species of rays cited as being caught in these articles. Of the 40 fish retailers interviewed, the majority were aged between 51 and 60 (32.5%) and between 31 and 40 (22.5%). It can be seen that the fish retail outlets are supplied by middlemen or directly by fishermen firom various fishing locations. For both the dry and rainy seasons, 17 fish were cited as the most frequent. Among the 32 most frequent fish throughout the year, "Gó" (22.4%) and "Bandeirado" (9.2%) were the most frequent. The presence of 43 species of commercialized bony fish was recorded, of which only three species were identified to genus levei due to their high morphological similarity. On the other hand, cartilaginous fish were identified at a specific levei in only two species due to the way they are sold, such as carcasses or types of cut, which makes it difficult to diagnose the species. We also identified two cases of homonymy, one of synonymy, and 12 totally local commercial names. We noticed a predominance of coastal fish sold in coastal towns (71%) and non-coastal towns (66.6%), but an increase in freshwater fish in non-coastal towns due to their case of logistics.

Avaliação das águas superficiais da bacia hidrográfica do baixo tocantis, Pará, Brasil: Um panorama no espaço e no tempo

Fri, 22 May 2026 00:00:00 GMT

Título: Avaliação das águas superficiais da bacia hidrográfica do baixo tocantis, Pará, Brasil: Um panorama no espaço e no tempo Autor(es): MELO http://lattes.cnpq.br/3542869559542094, Adriana da cruz; banca 1 ALVES JÚNIOR http://lattes.cnpq.br/2566643607928091, Flavio de Almeida; banca 2 LIMA http://lattes.cnpq.br/8021186707342335, Mauricio Willians de https://orcid.org/0000-0001-9092-8731; banca 3 CHAGAS http://lattes.cnpq.br/9393899936340805, Rafael Anaisce das https://orcid.org/0000-0002-1555-6154 Abstract: Preserving water quality is essential for human survival and environmental conservation. Despite Brazil possessing the largest amount of freshwater in the world, it faces a water crisis throughout its territory due to problems such as lack of sanitation, pollution from agriculture, and lack of water reuse. The Tocantins-Araguaia River basin, the second largest in the country, encompasses a vast area with 430 municipalities distributed across the states of Pará, Maranhão, Tocantins, Goiás, and Mato Grosso. This study focuses on the Lower Tocantins region in northeastern Pará, where abiotic and biotic water parameters will be evaluated to understand the environmental dynamics. Factors such as land use, anthropogenic actions, and periods of intense rainfall influence water quality, increasing turbidity and nutrient levels, such as nitrogen and phosphorus, which can lead to eutrophication. CONAMA Resolution 357/2005 is a fundamental instrument for monitoring water quality standards in Brazil, contributing to the sustainable use of this vital resource. This study aimed to evaluate environmental parameters, calculate the Trophic State Index (TSI), and analyze the influence of seasonality, focusing on eleven points distributed across seven municipalities in Pará state, in order to support the planning of water preservation actions in the region. The results show the influence of seasonality on water quality, with higher values of electrical conductivity in the less rainy period (79 μS cm⁻¹) compared to the rainy period (65 μS cm⁻¹), indicating a higher concentration of dissolved ions. Chlorophyll a was also higher in the less rainy period (12.2 μg L⁻¹) compared to the rainy period (9.8 μg L⁻¹), suggesting a greater supply of nutrients. Turbidity was higher during the less rainy period (97 NTU), while dissolved oxygen remained close to 6.4 mg L⁻¹ in both periods. The Trophic State Index ranged from 51.32 to 52.11, indicating a mesotrophic condition and the influence of seasonality on the limnological dynamics of the region.

Decifrando os desembarques de grandes bagres migradores: Como as características operacionais e sazonais moldam a pesca no estuário Amazônico?

Thu, 01 Jan 2026 00:00:00 GMT

Título: Decifrando os desembarques de grandes bagres migradores: Como as características operacionais e sazonais moldam a pesca no estuário Amazônico? Autor(es): COSTA, Izabelle Tavares da Abstract: Fishery resources play an important role in the global economy. In the Amazon, fishing is a traditional and economically significant activity that provides both income and food security. Amazonian fish production is dominated by large migratory catfish species, such as piramutaba, dourada, and filhote, which depend on extensive migrations to complete their life cycle. Analyzing fishery activity data is an indirect approach to assessing fish populations. This study aimed to investigate the operational, spatial, and temporal characteristics that influence the occurrence and intensity of catches of B. rousseauxii, B. vaillantii, and B. filamentosum at the mouth of the Amazon River. Using advanced statistical tools, we evaluated the relationship between the CPUE of B. rousseauxii, B. vaillantii, and B. filamentosum as a function of seasonality and fishery operational characteristics, such as fishing area and vessel fishing power in the Amazon estuary. To account for zero-inflated data, a Hurdle model was applied, allowing a two-part structure: a binary component indicating the absence of CPUE and a continuous component modeling positive CPUE values. The CPUE of dourada is influenced by vessel classification and by the interaction between area and period. The CPUE of piramutaba varies with fishing area and period, and the effect of the period changes depending on the area. The CPUE of filhote varies with vessel type, area, and period, and the effect of the period also changes according to the area. These findings underscore the need for management strategies that incorporate the seasonality and spatial heterogeneity of fishing in the Amazon estuary.

Produção de plântulas de ipê-rosa (Handroanthus heptaphyllus (Vell.) Mattos) em sistema de aquaponia com tambaqui (Colossoma macropomum, Cuvier, 1818.

Thu, 12 Feb 2026 00:00:00 GMT

Título: Produção de plântulas de ipê-rosa (Handroanthus heptaphyllus (Vell.) Mattos) em sistema de aquaponia com tambaqui (Colossoma macropomum, Cuvier, 1818. Autor(es): LOPES, Priscila Caroline Alves Abstract: Integrated production systems, like aquaponics systems, combine agricultural and aquaculture activities to promote sustainable practices. The present study assessed the growth of pink trumpet tree ((Handroanthus heptaphyllus (Vell.) Mattos) seedlings in aquaponic systems with various planting trays and cell models, alongside, tambaqui (Colossoma macropomum, Cuvier, 1818) cultivation. Five aquaponic systems were set up with different treatments for pink trumpet tree growth, using tubes tray, hydroponic cups, commercial seedling bags, polystyrene seedbeds, and açai seed substrate in the hydroponic beds. Additionally, a control treatment with conventional seedling bags was included outside the aquaponic system. The experiment lasted for 33 days. Water quality variables, fish growth performance, and pink trumpet tree growth were evaluated at the end of the experimental period. There were significant differences (p < 0.05) in water quality among the treatments. Dissolved oxygen levels were significantly lower (p < 0.05) in the açai seed substrate treatment (7.36 ± 0.06 mg L–1) compared to the seedbed (7.62 ± 0.02 mg L–1), hydroponic cup (7.65 ± 0.03 mg L–1), and seedling bags (7.57 ± 0.03 mg L–1) treatments, but similar to the seedling tubes treatment (7.49 ± 0.04 mg L–1). The different planting bed models did not significantly (p > 0.05) impact tambaqui growth performance in pink trumpet tree. The polystyrene seedbed treatment showed a significant increase (p < 0.05) in total length, aerial part length, and root length of the pink trumpet tree compared to other treatments. Total fresh mass was significantly higher (p < 0.05) in the polystyrene seedbed treatment compared to other treatments. Leaf area significantly increased (p < 0.05) in the polystyrene seedbed treatment. Dickson indices were significantly higher (p < 0.05) in the cup tray treatment compared to other treatments. The aquaponic system with tambaqui was effective in producing pink trumpet tree seedlings.