DENSIDADES DE PIRARUCU (&lt;i&gt;Arapaima gigas&lt;/i&gt;, TELEOSTEI, OSTEOGLOSSIDAE) EM LAGOS DAS RESERVAS DE DESENVOLVIMENTO SUSTENTÁVEL MAMIRAUÁ E AMANÃ, AMAZONAS, BRASIL

Arantes, Caroline C.; Garcez, Danielle Sequeira; Castello, Leandro

doi:10.31420/uakari.v2i1.13

Cited by 22 publications

(28 citation statements)

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“…Previous detailed descriptions of the procedures used in censusing arapaima populations have shown that the count data for arapaima in Jarauá are relatively reliable (Castello 2004;Castello et al 2009Castello et al , 2011. Count data were collected by local fishers who had their counts validated by concurrent total seine catches or markrecapture estimates of abundance (Arantes et al 2006Castello 2004). Also, the Mamirauá Institute monitors the accuracy of the counts through the use of field observers and crosschecks of counts in certain lakes.…”

Section: Data Sources and Interpretationsmentioning

confidence: 99%

Modeling population dynamics and conservation of arapaima in the Amazon

Castello

Stewart

Arantes

2011

Rev Fish Biol Fisheries

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To promote understanding of fish population dynamics in tropical river-floodplains, we have synthesized existing information by developing a largely empirical population model for arapaima (Arapaima sp.). Arapaima are characterized by very large bodies, relatively late sexual maturity, small clutches, and large parental investment per offspring, and their populations are overexploited and even declining due to overfishing. We used unparalleled time series data on growth, reproduction, catch-atage, and size-class abundance estimates for a population that has increased several-fold and undergone drastic changes in fishing practices in the Amazon, Brazil. Model population numbers were close to observed numbers, with generally low mean absolute percentage errors for juveniles (16%), adults (30%), and catch (18%). In using the model to test ecological hypotheses and to investigate management strategies, we found the following: (1) Annual recruitment is directly and positively related to spawner abundance, and it appears to be density-compensatory following a Beverton-Holt relation (R 2 = 0.85).(2) Fishingselectivity of arapaima caused by use of harpoons and gillnets can lower yield potentials dramatically through removal of the faster-growing individuals of the population. That is in part because fewer individuals live long enough to reproduce and survivors take longer to reach reproductive age. (3) Arapaima populations can sustain annual catches of up to 25% of the number of adults in the population the previous year if minimum size (1.5 m) and closed season (December-May) limits are met. (4) When 25% of the number of adults in the population the previous year is harvested under a 1.6 m minimum size limit of catch, catches are slightly smaller but abundance of adults in the population is considerably greater than under a 1.5 m limit. These findings can be used in ongoing management initiatives, but caution is needed because of present biological and ecological uncertainty about these fishes.

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Section: Data Sources and Interpretationsmentioning

confidence: 99%

Modeling population dynamics and conservation of arapaima in the Amazon

Castello

Stewart

Arantes

2011

Rev Fish Biol Fisheries

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“…The várzeas floodplains of the Amazon River constitute the largest flooded forest system within the Amazon basin, covering a total area of approximately 200 million hectares [32]. The Mamirauá Reserve represents one of the largest portions of the várzea, with high densities of arapaimas, reaching in some lakes more than 1,000 adults per square kilometer [33], [8]. The conservation of these environments may be reinforcing this refuge effect, given that the Unini and Auati-Paraná Extractivist Reserves, Mamirauá and Amanã Sustainable Development Reserves, together with the Jaú National Park, form a contiguous protected area of almost six thousand hectares.…”

Section: Discussionmentioning

confidence: 99%

“…In recent years, measures have been taken to ensure the conservation of this resource, which include the managed fishery of stocks in sustainable use protected areas, such as the Mamirauá Sustainable Development Reserve (RDSM), Amazonas, Brazil [6], [7]. Participative management has been developed in this conservation unit since 1992, producing satisfactory results, which include an increase in arapaima’s density [8], while the number of fishermen has also increased, along with their gross income [7].…”

Section: Introductionmentioning

confidence: 99%

Dispersal Capacity and Genetic Structure of Arapaima gigas on Different Geographic Scales Using Microsatellite Markers

et al. 2013

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Despite the ecological and economic importance of the Arapaima gigas (Cuvier 1817), few data about its dispersal capacity are available. The present study was based on the analysis of microsatellite markers in order to estimate the dispersal capacity of the species on fine, meso, and large geographic scales. For this, 561 specimens obtained from stocks separated by distances of up to 25 km (fine scale), 100 km (meso scale), and 1300–2300 km (large scale) were analyzed. The fine scale analysis indicated a marked genetic similarity between lakes, with low genetic differentiation, and significant differences between only a few pairs of sites. Low to moderate genetic differentiation was observed between pairs of sites on a meso scale (100 km), which could be explained by the distances between sites. By contrast, major genetic differentiation was recorded in the large scale analysis, that is, between stocks separated by distances of over 1300 km, with the analysis indicating that differentiation was not related solely to distance. The genetic structuring analysis indicated the presence of two stocks, one represented by the arapaimas of the Mamirauá Reserve, and the other by those of Santarém and Tucuruí. The dispersal of arapaimas over short distances indicates a process of lateral migration within the várzea floodplains, which may be the principal factor determining the considerable homogeneity observed among the várzea lakes. The populations separated by distances of approximately 100 km were characterized by reduced genetic differentiation, which was associated with the geographic distances between sites. Populations separated by distances of over 1300 km were characterized by a high degree of genetic differentiation, which may be related primarily to historical bottlenecks in population size and the sedentary behavior of the species. Evidence was found of asymmetric gene flow, resulting in increasing genetic variability in the population of the Mamirauá Reserve.

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“…), curimatã, aruanã, tucunaré, pacu, bodó, pirapitinga (Piaractus brachypomus) tambaqui and pirarucu; with the exception of jaraqui all others are caught in lakes (Barthem 1999;Viana 2004) and would thus be subjected to more intense regional fishing pressure. Some studies show that the fishing-management measures (including the zoning systems of lakes) adopted in Mamirauá have been successful to enhance the populations of pirarucu (Arantes et al 2005) and tambaqui (Costa et al 1999), but possible management effects on the whole fish community are not yet well known. Some studies show that the fishing-management measures (including the zoning systems of lakes) adopted in Mamirauá have been successful to enhance the populations of pirarucu (Arantes et al 2005) and tambaqui (Costa et al 1999), but possible management effects on the whole fish community are not yet well known.…”

Section: Study Areamentioning

confidence: 99%

Effects of fisheries management on fish communities in the floodplain lakes of a Brazilian Amazonian Reserve

Silvano

Ramires

Zuanon

2009

Ecology of Freshwater Fish

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We compared fish abundance, diversity and species composition between lakes open (fished) and closed (no-take) to fishing activities in Mamirauá Sustainable Development Reserve in the Central Brazilian Amazon, in order to investigate potential influences of the common-based management. We sampled 1483 fishes from 70 species through gillnet fishing during the low-water season, in seven fished and seven no-take lakes. Contrary to expected, the mean values for abundance, size, diversity and species-richness of fish did not differ between fished and no-take lakes. There was no difference between fished and no-take lakes considering only the abundance of the 14 fish species more intensely targeted by fishermen. However, the abundance of an important commercial fish, the tambaqui (Colossoma macropomum) was higher in no-take lakes. Such data from a rapid assessment may be useful to monitor this and other fishery co-management schemes.

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DENSIDADES DE PIRARUCU (<i>Arapaima gigas</i>, TELEOSTEI, OSTEOGLOSSIDAE) EM LAGOS DAS RESERVAS DE DESENVOLVIMENTO SUSTENTÁVEL MAMIRAUÁ E AMANÃ, AMAZONAS, BRASIL

Cited by 22 publications

References 0 publications

Modeling population dynamics and conservation of arapaima in the Amazon

Modeling population dynamics and conservation of arapaima in the Amazon

Dispersal Capacity and Genetic Structure of Arapaima gigas on Different Geographic Scales Using Microsatellite Markers

Effects of fisheries management on fish communities in the floodplain lakes of a Brazilian Amazonian Reserve

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