Dissertações em Ecologia Aquática e Pesca (Mestrado) - PPGEAP/NEAP

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3479

O Mestrado Acadêmico iniciou em 2007 e pertence ao Programa de Pós-Graduação em Ecologia Aquática e Pesca (PPGEAP) do Núcleo de Ecologia Aquática e Pesca da Amazônia (NEAP) da Universidade Federal do Pará (UFPA).

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Acesso aberto (Open Access)
Biodiversidade e variação espaço-temporal da abundância das populações de camarões e estrutura populacional de Farfantepenaeus subtilis (Pérez-Farfante, 1967) (Penaeidae) em um estuário do litoral amazônico brasileiro
(Universidade Federal do Pará, 2013-04-22) FERREIRA, Valdimere; MARTINELLI-LEMOS, Jussara Moretto; http://lattes.cnpq.br/5264841936875017
This study investigated the biodiversity and spatial-temporal distribution of abundance of populations of shrimp and described the population structure of the Farfantepenaeus subtilis in an Amazonian Estuary. The shrimps were collected monthly from August 2006 to July 2007 in the rainy (January to June) and dry (July to December) season with bottom trawling and beach seine in the Middle-Upper (MU), Medium (M) and Low (L) sectors. In each sector two sites were sampled, of which two bottom trawling five minutes each and three beach seine of 150 m2 each were performed. The variables: temperature, pH and salinity of water and grain size and organic matter of the sediment were analyzed. For each shrimp were recorded the length Total - CT and cephalothorax - CC, total weight, sex and stage of gonadal maturation. The salinity differ between sectors I and MS (p <0.05) and M showed low organic matter content. The salinity differ significantly among sectors I and MS (p <0.05) and M showed low organic matter content. In all sectors the sand grains were prevalent on substrate, especially the fine sand in sector M. A total of 11,939 shrimps were collected, divided into twelve species and six families. Palaemonidae and Penaeidae had higher richness with five and three species, respectively. Penaeidae, Sergestidae and Palaemonidae had higher abundance, with Xiphopenaeus kroyeri, F. subtilis, Acetes marinus and Nematopalaemon schmitti, contributing 43, 31, 21 and 1.3% of the total catch, respectively. The species F. subtilis, X. kroyeri and Litopenaeus schmitti contributed 97% of the total biomass. The density and biomass from F. subtilis differ between the rainy and dry seasons (p <0.05) being higher in rainy season. In the rainy season, the density of X. kroyeri was higher in sectors M and I and dry season in sectors MS and M with higher biomass in sector I in both seasons. The density and biomass A. marinus was high in sector I (p <0.05). The salinity, sand, silt and clay significantly influenced the spatial and temporal distribution of abundance of shrimps (p <0.05). The CC of female F. subtilis was higher than males with 13.7 mm and 12.8 mm, respectively and differed in March (p <0.05). Females were more abundant and sex ratio was 0.8:1 especially in January, February, May and the total analysis (p <0.05). Developed shrimps occurred in rainy and abundance of juveniles was higher from January to June when it occurs the most intense peak spawning in the open sea.
Acesso aberto (Open Access)
Composição, abundância e pesca da ictiofauna como indicadores do estado de conservação de dois lagos de várzea no baixo Rio Amazonas (Brasil)
(Universidade Federal do Pará, 2010) ALMEIDA, Morgana Carvalho de; ISAAC, Victoria Judith; http://lattes.cnpq.br/3696530797888724
The Amazon floodplain has a rich biodiversity and its characteristics influence the economically and ecologically important natural aquatic resources for the people. On the basis of these information, the objective of this research was to characterize the composition and abundance of ichthyofauna in two floodplain lakes in the Santarem region, and to understand the use I buy fishers in the Piracãoera and Campos fishing communities, in the Urucurituba region, and Barreira and Correio communities in the Tapará region. Samples were taken in the Aramanaí and Curiquara lakes considering the four hydrological periods (rising, flood, low, dry) for the period between July of 2006 and April of 2007. For the fish sampling were used set gillnets batteries. To collect data on catches of fishermen, forms were used that contained information about the characteristics of the fisheries. We caught 10,146 fish, which were distributed in 156 species, 27 families and 8 orders. The most abundant families in number of individuals were Sciaenidae and Loricariidae. In Aramanaí Lake, the Loricaria sp, was the species with the highest CPUAn with 0.02 individuals per m². hour. In terms of CPUAp featured species Potamotrygon motoro, with 0.13 g.m ². hour and Pterygoplichthys pardalis with 0.11 g. m². hour. In Curiquara Lake, the main catch in number of individuals was represented by the Pachypops fourcroi with 0,001 individuals per m² of gillnet. Curiquara and Aramanaí lakes 9 trophic guilds were identified and for both lakes fish piscivores and detritivores showed the largest catch by weight. The average length of individuals caught in the lakes was 20.27 ± 7.53 cm. The highest mean length of individuals was in the flood and lower in the low period. When fishing is practiced by fishermen used a variety of fishing gear devices highlighting the gill netting. The use of gear depends on the environment exploited, target species, and in addition to the season, and there may be combinations of more than one gear during the catch. The average yield of the fisheries in the two regions was 10 kg.fishermen.dia-1. In Urucurituba region the CPUE average was 16kg.fishermen.dia-1, in Tapará was 4.5 kg.fishermen.dia-1. The Urucurituba’s fishermen showed the higher catch volume and fish marketing. These communities are partially fulfilling the rules of the fisheries agreements.

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