Relative growth, morphological sexual maturity, and size of<i>Macrobrachium amazonicum</i>(Heller 1862) (Crustacea, Decapoda, Palaemonidae) in a population with an entirely freshwater life cycle

Pantaleão, João Alberto Farinelli; Hirose, Gustavo Luis; Costa, Rogério Caetano da

doi:10.1080/07924259.2011.587276

Cited by 54 publications

(78 citation statements)

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“…The predominance of females and the smaller size of males are strong indications that the mating system in this case is "pure search" (sensu Correa and Thiel, 2003). This reproductive pattern was also observed in populations of Macrobrachium amazonicum (Heller, 1862) that inhabit lentic environments (Pantaleão et al, 2012;Rocha et al, 2015).…”

Section: Discussionmentioning

confidence: 80%

Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil

Rocha

Barbosa

2017

Nauplius

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The freshwater prawn Macrobrachium jelskii (Miers, 1877) is widely distributed in South America's lentic and lotic habitats. We studied the population structure and reproductive biology of the species in the municipality of Cruz das Almas, state of Bahia, Brazil, to supply information on this ecologically and economically relevant species. Samples were collected monthly, from February 2013 to January 2014, at Laranjeiras pond. The sex ratio was biased towards females (1.4 females : 1 male). The mean carapace length of females and males was respectively 8.08 ± 1.37 mm and 6.61 ± 1.11 mm. Ovigerous females comprised 22.5% of all sampled females, and their reproductive activity, characterized as seasonal-continuous, was positively correlated with precipitation. The average size of females at the onset of functional maturity was estimated at 6.67 mm CL and the mean fecundity was 25.2 ± 8.9 eggs. Egg size, mass and volume increased significantly during embryonic development. Our data strongly indicate that the reproductive strategy that best fits the species is the "pure search" mating system.

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Section: Discussionmentioning

confidence: 80%

Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil

Rocha

Barbosa

2017

Nauplius

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“…There are records that populations that inhabit different geographical regions have biological variations (Maciel & Valenti, 2009;Pantaleão et al, 2011;Vergamini et al, 2011), such as reproductive adaptations, especially those that were observed in species belonging to the genus Macrobrachium that have adjusted to freshwater environments. These adjustments include females with lower fertility, production of larger eggs and with a greater amount of yolk, larger larvae with benthic habit and an abbreviated larval development in terms of duration and stages (2-3 stages), besides smaller adults (Rabalais & Gore, 1985;Anger, 2001;Bauer, 2011).…”

Section: __________________ Corresponding Editor: Enrique Duprémentioning

confidence: 99%

Reproductive biology of Macrobrachium amazonicum (Heller, 1862) (Decapoda: Palaemonidae) in a reservoir situated in Minas Gerais State, southeastern Brazil

Silva

Jacobucci

Mossolin

2017

lajar

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ABSTRACT. The palaemonid shrimp Macrobrachium amazonicum is widely distributed in coastal rivers, estuaries and inland waters of South America. Despite this, little is known regarding its biology in the natural environment. Furthermore, this species is economically important because it is the main freshwater shrimp commercially exploited by artisanal fisheries in northern and northeastern Brazil, besides showing great potential for aquaculture. Considering this, the present study aimed to analyze aspects of the reproductive biology of M. amazonicum. A total of 251 females were analyzed, 102 of these being ovigerous. The carapace length ranged from 6.03 to 10.06 mm (average ± standard deviation: 7.52 ± 0.84 mm). Reproduction was continuous with a gradual increase from April to June 2012. No significant relationship between frequency of ovigerous females and environmental variables was observed. The fecundity showed a positive linear relation with the carapace length and the number of eggs varied from 33 to 389 (average ± standard deviation: 203 ± 78.06 eggs/female). A dominance of eggs at an early stage was observed in most months. There was an increase in the size/volume of eggs from early to late embryonic stage. Ovigerous females produced eggs at the same development stage, with the same size and volume regardless of their body size. The results demonstrated higher similarity of this population to other continental M. amazonicum populations than from estuarine ones, showing the environment influence in the life-history of individuals.

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“…Based on this analysis, it was possible to determine whether the data for each relationship should be represented by a single straight line or should be represented by different linear equations for the groups (Pantaleão et al, 2011).…”

Section: Samplingmentioning

confidence: 99%

The relative growth and sexual maturity of the freshwater crab Dilocarcinus pagei (Brachyura, Trichodactylidae) in the northwestern region of the state of São Paulo

Herrera

Davanso

Costa

et al. 2013

Iheringia, Sér. Zool.

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ABSTRACT. The aim of the present study was to determine the size at sexual maturity in the freshwater crab Dilocarcinus pagei Stimpson, 1861, from a population located in Mendonça, state of São Paulo, Brazil. The crabs were sampled monthly (July 2005 to June 2007, at Barra Mansa reservoir. The specimens were captured manually or in sieves passed through the aquatic vegetation. The crabs were captured and separated by sex based on morphology of the pleon and on the number of pleopods. The following dimensions were measured: carapace width (CW); carapace length (CL); propodus length (PL); and abdomen width (AW). The morphological analysis of the gonads was used to identify and categorize individuals according to their stage of development. The morphological maturity was estimated based on the analysis of relative growth based on the allometric equation y = ax b . The gonadal maturity was based on the morphology of the gonads by the method CW 50 which indicates the size at which 50% of the individuals in the population showed gonads morphologically mature to reproduction. The biometric relationships that best demonstrated the different patterns of growth for the juvenile and adult stages were CW vs. PL for males and CW vs. AW for females (p<0.001). Based on these relationships, the estimated value to morphological sexual maturity was 21.5 mm (CW) in males and 19.7 mm (CW) in females. The determination of the size at sexual maturity and the adjustment of the data based on the logistic curve (CW 50 ) resulted in a size of 38.2 mm for males and 39.4 mm for females (CW). Based on the data obtained for sexual maturity for D. pagei, we can estimate a minimum size for capture of 40 mm (CW). This minimum size allows at least half of the population to reproduce and retains the juveniles and a portion of the adults in the population.KEYWORDS. Allometric growth, gonadal maturity, morphological maturity, reproduction. Os caranguejos foram separados por sexo, de acordo com a morfologia do abdome e pleópodos. As dimensões mensuradas foram: largura da carapaça (LC); comprimento da carapaça (CC); comprimento do própodo (CP) e largura do abdome (LA). Além disso, análise morfológica das gônadas foram realizadas e caracterizadas em relação ao estágio de desenvolvimento. A maturidade morfológica foi estimada com base no estudo do crescimento relativo, esta análise é baseada na equação alométrica y = ax b e a maturidade gonadal através da morfologia das gônadas, utilizando o método LC 50 indicando o tamanho em que 50% dos indivíduos encontram-se com gônadas desenvolvidas para a reprodução. As relações biométricas que melhor indicaram os diferentes padrões de crescimento das fases jovem e adulta foram LCxCP para os machos e LCxAB para fêmeas (p<0,001). Baseado nessas relações, o valor estimado para a maturidade sexual morfológica em machos foi de 21,5 mm (LC) e de 19,7 mm de (LC) para fêmeas. Na determinação da maturidade sexual gonadal, o ajuste da curva logística (LC 50 ) resultou em um tamanho de 38,2 mm para os machos e 39,4 mm para...

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Relative growth, morphological sexual maturity, and size ofMacrobrachium amazonicum(Heller 1862) (Crustacea, Decapoda, Palaemonidae) in a population with an entirely freshwater life cycle

Cited by 54 publications

References 28 publications

Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil

Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil

Reproductive biology of Macrobrachium amazonicum (Heller, 1862) (Decapoda: Palaemonidae) in a reservoir situated in Minas Gerais State, southeastern Brazil

The relative growth and sexual maturity of the freshwater crab Dilocarcinus pagei (Brachyura, Trichodactylidae) in the northwestern region of the state of São Paulo

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