Victoria Isaac results 36
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Hydroelectric dams are common in Amazonian tributaries under federal environmental licensing that requires long‐term fisheries monitoring. This study evaluated three fishing systems targeting “pacu” species (Serrasalmidae) in the Xingu River before, during, and after construction of the Belo Monte dam (2012–2023) across four river sectors: Upstream, Reservoir, Reduced Flow Sector, and Downstream. We aimed to quantify spatial a...
The southern brown shrimp (Penaeus subtilis) is the primary crustacean species commercially exploited by the industrial trawl shrimp fleet operating over the Amazon continental shelf. However, there is no information on the economic viability of this activity. Economic studies on fisheries can provide guidance in the design and implementation of management measures. This study estimated the cost and profitability of industrial...
Plastic tree shelters are widely used in agriculture and forestry to protect young plants from predators and generate a favorable microclimate, thus increasing survival and growth rates. Considering that several thousand tons of plastic tree shelters (mostly polypropylene, PP) are used each year in Europe and that discarded aged shelters can release microplastics, residues of additives, and even pesticides, the destination of...
Ecological risk assessment (ERA) has been widely used to assess species’ vulnerability to the impacts of fishing and then to prioritize any additional management actions to reduce impacts. The Ecological Risk Assessment for the Effects of the Fishing framework is based on a hierarchy of qualitative and semi-quantitative tools that work well in data-deficient situations. This study first used the Scale Intensity and Consequence...
How does climate change affect small scale fisheries? A case study of the Lower Amazon in BrazilNARA Subscribed
Effects of global climate change on inland artisanal fisheries have received little attention from scientists. We investigated fisheries of the Lower Amazon in Brazil using a wavelet analysis of a 13‐year data series of fishery catches, environmental variables, and climatic indices, to determine how these variables affected catches of different species. The catch per unit of effort (CPUE) of gillnet and line fisheries increase...
Fishery catches on the Lower Amazon River were analyzed in relation to the hydrological cycle, temporal shifts in fishing effort, and the use of nets or lines in lakes and rivers. The study was based on a temporal series of catch data collected between January 1993 and June 2011. The variables analyzed were the total catch, use of gillnets or lines, the environment targeted (lakes or rivers), and fishing effort. Temporal trend...
NEOTROPICAL FRESHWATER FISHES : A dataset of occurrence and abundance of freshwater fishes in the NeotropicsNARA Subscribed
The Neotropical region hosts 4225 freshwater fish species, ranking first among the world's most diverse regions for freshwater fishes. Our NEOTROPICAL FRESHWATER FISHES data set is the first to produce a large‐scale Neotropical freshwater fish inventory, covering the entire Neotropical region from Mexico and the Caribbean in the north to the southern limits in Argentina, Paraguay, Chile, and Uruguay. We compiled 185,787 distri...
The Southern red snapper, Lutjanus purpureus , is a valuable economic resource, especially in international market. However, no recent data are available on the reproductive biology of this species in Brazilian waters, in particular, the stock found on the Amazon reef. The present study evaluated the population structure and reproductive biology of L. purpureus , and the volume of the catch of juveniles taken by the local comm...
The purpose of this study was to better understand the life cycle of brown shrimp along the Amazon Continental Shelf by using spatial and temporal trawl fleet activities. A total of 208,121 specimens and 1281 trawls were studied throughout the course of 13 years of shrimp size composition. To investigate differences in length composition between fishing grounds, months, and depth, a PERMANOVA analysis was employed. A geographi...
Multidimensional Evaluation of Brown Shrimp Trawling Fisheries on the Amazon Continental ShelfOA Marine
Brown shrimp ( Penaeus subtilis ) trawling in the northern coastal waters of Brazil is an industrial fishing activity with a share in the international market and an important resource in the fishery market. Due to the scarcity of updated information on this practice and owing to its complexity, it is difficult to have a measurement of all dimensions of the development of this fishery, whether they are ecological, economic, or...