Dinâmica populacional da matrinxã Brycon amazonicus (Characidae) na Amazônia Central

Abstract

ABSTRACT. Population dynamics of matrinxã Brycon amazonicus (Characidae) in Central Amazon. The matrinxã, Brycon amazonicus (Spix & Agassiz, 1829) is one of the most important fishery resources of the Amazonas state. Its population dynamics in Central Amazon was analyzed based on total landing and biometry data registered in the main landing port of Manaus, between 1994 and 2002. Growth and mortality rates were estimated separately for the rivers Purus, Madeira and Solimões. Differences in size structure and growth curves suggest that different population units exist among these rivers, requiring individualized evaluation and fisheries management strategies. The analysis of the yield per recruit does not indicate overexploitation. However, the highest relative exploitation rate was observed in the Madeira river. The suggested management strategies are related to restrictions to the fishery in the main fishing grounds during the migratory dispersal period, instead of restrictions during reproductive periods.

Distribution of economically important fish larvae (Characiformes, Prochilodontidae) in the Central Amazonia, Brazil

“…Fish of the family Prochilodontidae, such as jaraquis (Semaprochilodus insignis Jardine & Schomburgk and Semaprochilodus taeniurus Val. ), and curimatás (Prochilodus nigricans Agassiz), belong to a group of neotropical Characiformes of high commercial importance and are intensively fished in the Amazonian region (Santos-Filho & Batista, 2009). These species show high interannual variation in the fish landing statistics and are highly important economically.…”

Ecosystem‐based management of Amazon fisheries and wetlands

“…Based on length and weight data in the central Amazon, curimatá ( Prochilodus nigricans , Prochilodontidae) is now heavily fished (Catarino, Campos, Souza, & Freitas, ). Matrinchã was not considered to be overfished in the central Amazon based on data collected between 1994 and 2002 (Santos‐Filho & Batista, ), although the present dominance of this species in the large Manaus market from aquaculture strongly suggests that overfishing has occurred in a manner similar to that observed for tambaqui. Possible growth overfishing of jaraqui ( Semaprochilodus insignis and Semaprochilodus taeniurus , Prochilodontidae) was recognized as early as the late 1980s (Batista & Isaac, ; Ribeiro & Petrere‐Jr, ) but subsequent seine mesh agreements led to recuperation of stocks.…”

<b>Jatuarana fishing dynamics <i>Brycon amazonicus</i> (Spix & Agassiz, 1829) of the upper and middle Madeira River Basin

“…The loss of size classes can trigger stock depletion and should be one alert for the manager. Despite of, for both areas, the catches were concentrated on the classes of adults fish (from 38 to 40 cm standard length -individuals able to reproduce, considering the minimum size at first maturity of 32 cm standard length; Filho & Batista, 2009). …”

“…Until now, all studies about this specie were carried out along of the Central Amazon which had reported on age and growth (Barthem & Fabré, 2004), stocks state (Ruffino, 2004) and/or population dynamics (Filho & Batista, 2009). No studies on this species have been carried out in the Madeira River basin, where there is an important resource fishery with an annual production that represented around 8% of the total (Doria et al, 2012).…”