Navegando por CNPq "CNPQ::CIENCIAS AGRARIAS::RECURSOS PESQUEIROS E ENGENHARIA DE PESCA::ENGENHARIA DE PESCA"

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Acesso aberto (Open Access)
Avaliação do efeito dos principais itens da dieta natural de Astronotus ocellatus (Cuvier, 1829) da Reserva Mamirauá (AM, Brasil) sobre a sua coloração reprodutiva em ambiente artificial
(Universidade Federal do Pará, 2007) CHAVES, Rui Alves; QUEIROZ, Helder Lima de; http://lattes.cnpq.br/3131281054700225
In order to test the influence of feeding items in the coloration of acara-açus the present study was carried through two stages. The first one aimed the identification of the main alimentary groups of Astronotus ocellatus diet through the analysis of the stomachal and intestine research. Secondly, it aimed to compare the effect caused by the different groups of diet, in an artificial environment, on the red coloration and the acquisition of corporal mass of the tested individuals. At the first stage the activities had been developed in the Reserve of Sustainable Development Mamirauá (RDSM) were 216 individuals. After the preservation of the digestive tracts these were analyzed qualitatively, under the microscope. The diet items found in the contents had been classified using broad categories such as: molluscs, crustaceans, insects, fish and vegetables, as well as unknown material. The length of the first sexual maturation was calculated. The variation of the water level in the RDSM during the period of the study was obtained from Mamirauá Institute. The in-dake index for each food item was calculated by the product of the frequency of relative occurrence and relative weight of each item and the total of products for all itens identified. The main itens identified were fish, insects and molluscs. Twenty individuals of Astronotus ocellatus had been captured in Marajó Island in febrary/2006, and placed in fifteen (15) glass tanks at the aquacultive station of Utinga (Belém, Pará). On the basis of the results from the first stage and on current literature, five diet treatments were designed for the experiment: T1 - Commercial formula (control); T2 - Fish; T3 - Molluscs, T4 - Insects; T5 - Crustaceans. The analysis of the Index of Intensity of Red Coloration was based on the comparison of the levels of intensity of proportionate color for specific software, and the Index of Increment of the Red Coloration of oceli and the diffuse lateral coloration were calculated. The diet treatment with molluscs resulted in the largest increment of the index of intensity of red coloration in oceli at the end of 20 days. The diet treatment with crustaceans resulted in the largest increment of index of intensity of the diffuse lateral red coloration at the end of 20 days. The animals submitted to almost all the treatments had presented an increase in body mass throughout 40 continous days of experiment, but those fed with molluscs presented a to greater acquisition of biomass.
Acesso aberto (Open Access)
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.