http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/4381 Sat, 27 Sep 2025 09:35:46 GMT 2025-09-27T09:35:46Z http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9574 Título: Bioeconomia pesqueira em Pernambuco: análise econômica da produção e comercialização de pescado Autor: FRANÇA, Vinícius Fellype Cavalcanti de Primeiro orientador: ANDRADE, Humber Agrelli de Abstract: Fisheries and aquaculture have an essential role in the economics of several traditional communities from inland to the coastal zones. These activities have been highlighted in literature as relevant for addressing global problems associated with hunger and malnutrition, whether by generating income or by offering quality protein at affordable prices to low-income households. However, even though fishing and aquaculture play important socioeconomic roles for tropical, studies evaluating the economic dynamics of these sectors are scarce, and in the Brazilian case, generally limited to South and Southeast regions of the country. Given this, in the present work generalized linear models were analyzed to evaluate the economic aspects related to aquaculture and the fish market in the state of Pernambuco, with results divided into two works. In one of them, a census data survey was carried out with the aquaculture producers from Feira Nova municipality (Pernambuco’s Agreste), with the collection of information about management characteristics, aspects of the properties, cultures, and economic variables, used to calculate indices of farm’s profitability. Generalized linear models were then adjusted to understand the relationship between the variables and the calculated profitability indices. Subsequently, the Pernambuco Supply and Logistics Center (CEASA-PE) database was used to analyze the volatility of sardine prices sold in the state and evaluate the forecasting performance of two machine learning algorithms in the analysis of trade and commercialization of seafood items. In the first article, variables related to management and economy presented higher explanatory power for the profitability indices of aquaculture production in Feira Nova. However, there were important differences in how the variables are related to economic indices in shrimp and tilapia farming, evidencing the potential applicability of genearalized linear models in this analytical context. In the second article, the volatility of sardine prices varied throughout the period evaluated, showing peaks during the period of the new coronavirus (COVID-19) pandemic. Both evaluated machine learning algorithms demonstrated reduced error measurements, highlighting the applicability of these tools to forecast seafood prices, but the long short-term memory (LSTM) neural network performed better than Fbprophet. The results presented expand knowledge about the aquaculture economy and the price dynamics of Pernambuco’s fish market. Instituição: Universidade Federal Rural de Pernambuco Tipo do documento: Dissertação Tue, 06 Feb 2024 00:00:00 GMT http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9574 2024-02-06T00:00:00Z http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9573 Título: Efeito da frequência do ajuste do equilíbrio iônico no desempenho zootécnico do Litopenaeus vannamei (Boone, 1931) em sistema simbiótico em águas oligohalinas Autor: OLIVEIRA, Valdemir Queiroz de Primeiro orientador: OLIVERA GÁLVEZ, Alfredo Abstract: The cultivation of the marine shrimp Litopenaeus vannamei in low salinity water is an increasingly developing practice. This practice is possible due to the adjustments made to the main ions necessary for the animal's development. Studies report that these ions are used by shrimp to carry out metabolic reactions, as well as in the biofloc system, they stimulate the stabilization of the system and the formation of microbial flakes. However, the frequency that these ions must be replaced in the system is not known. Therefore, the present study aimed to evaluate the effect of different frequencies of ionic adjustment in the cultivation of marine shrimp in low salinity, as well as to verify the effect of this correction on the composition mineral of the biofloc and body composition of marine shrimp L. vannamei. An experimental cultivation was carried out over 40 days, the larvae were stored after larvae at a density of 2000cam.m-³, in 5 treatments: SW (sea water- salinity 31), SWD (diluted sea water - salinity 2.3), 1IA (salinity 2.3 - adjustment only on the 1st day) - 2IA (salinity 2.3 - adjustment on the 1st and 20th day) and 3IA - (salinity 2.3 - adjustment on the 1st, 10th and 20th day). The water quality variables remained within the recommended levels for the cultivation of L. vannamei in a biofloc system. The zootechnical performance parameters between the low salinity treatments did not differ significantly when compared to each other, however the results were superior to those found for the high salinity treatment. When evaluating the concentration of minerals in the biofloc and biomass of shrimp, it was observed that the frequency of the ionic adjustment did not significantly influence these parameters either, differing only when compared to the composition of elements in seawater. At the end of culture, the animals were subjected to an ammonia stress test for 96h, however, all treatments obtained 100% survival after the test period. Thus, based on the results obtained, the use of seawater diluted to salinity 2.3 without performing ionic adjustments throughout the cultivation of L. vannamei in the nursery phase does not represent losses to zootechnical indices, and it is possible to obtain the same production rate and cost reduction related to fertilizers used to carry out ionic corrections. Instituição: Universidade Federal Rural de Pernambuco Tipo do documento: Dissertação Wed, 08 Dec 2021 00:00:00 GMT http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9573 2021-12-08T00:00:00Z http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9572 Título: Variabilidade das espécies-alvo e adensamentos do espadarte (Xiphias gladius) capturados pela frota brasileira de espinhel pelágico no Atlântico tropical e subtropical oeste Autor: RODRIGUES, Silvaneide Luzinete Primeiro orientador: ANDRADE, Humber Agrelli de Abstract: Tuna and like are among the most important in the marine environment from an economic and social point of view. On the other hand, many of these species are already being exploited to their maximum sustainable limit or are overexploited, with the aggravation of relatively high market demand. There is a clear need for ongoing inventory assessments and effective management to maintain or recover overexploited stocks. Among the main challenges for the sustainable management of marine resources is the achievement of relative abundance indexes that reflect the real state of the stock biomass. In view of this context, the present study initially analyzed the history of catching commercial pelagic longline fishing in Brazil from 1978 to 2018, focusing on the identification of fishing targets. Subsequently, the spatial distribution patterns of swordfish (Xiphias gladius) from the South Atlantic were investigated for the construction of abundance indicators. For this purpose, the available data on catch, effort and geographic location of the fishing bids, analyzed in the National Tuna and Related Data Bank (Banco Nacional de Dados de Atuns e Afins-BNDA), were analyzed. Then, a statistic was calculated with ratios between catches of the different species, which was used as an indicator of the direction of the fleet. The spatial densification structure was evaluated based on spatial autocorrelation calculations. The results of the initial analysis revealed a mosaic of flags, target species, technologies and fishing strategies, which can be grouped into three distinct moments. In the first (1978-1986) there is a predominance of leased vessels in the east, and the targeting for swordfish is accentuated. The second phase (1987-2001) was marked by an increase in the targeting for yellowfin tuna, mainly white. Finally, in the third phase (2002-2018), several vessels were leased, and there was an increase in the targeting for swordfish and blue sharks. In addition, the swordfish capture data from the Brazilian fleet showed a moderate degree of spatial dependence. In some cases the dependence is manifested in moves made with a distance of more than 1000 km between them. The size and distribution of densities have varied greatly over the years. Thus, the knowledge of these variations in the calculations of estimates of relative abundance indexes is essential to avoid misinterpretations when assessing the stock and, consequently, in fisheries management. Instituição: Universidade Federal Rural de Pernambuco Tipo do documento: Dissertação Fri, 14 Feb 2020 00:00:00 GMT http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9572 2020-02-14T00:00:00Z http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9571 Título: Avaliação do uso de Crassostrea sp. como bioindicador do vírus da mionecrose infecciosa em estuários de fazendas de engorda de Litopenaeus vannamei em Pernambuco Autor: SILVA, Scarlatt Paloma Alves da Primeiro orientador: SILVA, Suzianny Maria Bezerra Cabral da Abstract: Infectious Myonecrosis is a disease caused by the Infectious Myonecrosis Virus (IMNV), and its main characteristic is skeletal muscle necrosis and cumulative mortality of 70% throughout the Litopenaeus vannamei cycle. Thus, aiming at preventing outbreaks and detecting subclinical infections of IMNV for L. vannamei, an action that can be adopted is the development of a monitoring plan for the virus in the environment, through the use of sentinel organisms. However, to date, there are no protocols that apply these organisms, such as bivalves, to monitor IMNV. For this reason, the objective of this work is to evaluate the use of wild oysters (Crassostrea sp.) as sentinels/bioindicators for the detection of IMNV in areas close to L. vannamei producing units located in the estuaries of the Botafogo and Passos rivers, both located in Pernambuco. The collections of the specimens were carried out during the summer and winter, in the North and South coasts of the state. Each coast had 3 collection points, and each point had a total of 25 animals sampled, thus totaling 75 animals per coast and 150 per season of the year. These animals were evaluated for the presence of IMNV through real-time PCR and histopathological analysis. For statistical analysis, the nonparametric Mann-Whitney U and Kruskal-Wallis tests were used, followed by Dunn's post-hoc test. There were no statistical differences in the percentage of Crassostrea sp. infected by IMNV by collection site and season of the year, with positive detection of animals on both coasts and stations analyzed. As for viral load, the mean values determined on the north coast did not differ statistically in the summer, with the highest mean viral load (1.47x104 viral copies of IMNV/μl of total RNA) at point A, for the winter. On the south coast, for the summer, the lowest mean value of viral load was found at point C, with 5.22x103 viral copies of IMNV/μl of total RNA. On the other hand, during winter, no differences in viral loads were detected. No histopathological lesions were found to suggest infection of oysters by IMNV. It is concluded that the oysters Crassostrea sp. wild species, can be efficiently used as a bioindicator of IMNV for monitoring this pathogen in estuaries of L. vannamei shrimp production units, without the need to collect shrimp on farms, being, therefore, candidate organisms for the development and implementation of programs of sanitary surveillance of aquatic animals. Instituição: Universidade Federal Rural de Pernambuco Tipo do documento: Dissertação Fri, 25 Feb 2022 00:00:00 GMT http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/9571 2022-02-25T00:00:00Z