Macrobrachium amazonicum (Heller, ). AphiaID. (urn:lsid: :taxname). Classification. Biota; Animalia. Pupil of a Macrobrachium amazonicum (freshwater shrimp). Alex H. Griman. Affiliation: Alex Kawazaki Photography São Paulo, Brazil. Technique. Macrobrachium amazonicum — Overview. Amazon River Media. Image of Macrobrachium amazonicum. Macrobrachium amazonicum Unreviewed.

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Maria Lucia Negreiros Fransozo and the anonymous reviewer for their extremely constructive comments on an earlier version of this manuscript; and to Dr. The palaemonid shrimp Macrobrachium amazonicum shows an unusually large geographic range ca. CL, with an estimated size at onset of morphological sexual maturity of 8.

In general, chelipeds had few spines and segments were translucent. The mean value of spine angles for the four groups is presented on Table 4. The relative growth was analyzed based on the change in growth patterns of certain body parts in relation to the independent variable CL.

GC1 and GC1 vs. Thus, the passage from one morphotype to another in macrkbrachium natural environment could occur through a single molt.

Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae).

Additionally, the spination pattern of the chelipeds among the four morphotypes of our specimens was quite different, similar to demonstrated by Moraes-Riodades and Valenti Four samples were taken during the morning, in each month, from January through April 16 samples. The prawns ammazonicum sexed and identified by the presence or absence of the appendix masculina on the second pair ,acrobrachium pleopods Valenti, However, cheliped length was always greater in GC2.


Therefore, our hypothesis is that the high degree of plasticity in morphological characters among populations throughout the geographical distribution of M.

Male population structure of the Amazon River prawn Macrobrachium amazonicum in a natural environment. Reproductive and morphometric traits of Macrobrachium amazonicum Decapoda: Carapace length ranged from 4.

Culture of the Amazon River Prawn Macrobrachium amazonicum. This method distributes the data into groups of numbers previously established by an iterative process that minimizes the variance within groups and maximizes the variance among them.

All these differences persist also in long-term cultures maintained under constant conditions. The number of captured prawns was large in the months whose level of water was low; the inverse was observed in the months that the river was with a high volume of water.

On the biology, origin, and radiation of freshwater-invading shrimp. Size-weight relationships differed significantly between males and females, indicating sexspecific morphometric differences. Table 1 provides a detailed description of each group. The DNA barcoding and the caveats with respect to its application to some species of Palaemonidae Crustacea, Decapoda.

On the other amwzonicum, even if GC1 and GC2 have identical gonads and very similar body size, the differences in weight and size of chelipeds can be reflected in their different roles in the environment, which would characterize them as distinct castes. Consequently, we could determine which of these initial variables has more influence on the differentiation of possible morphological categories morphotypes.

Palaemonidae from the Pantanal, Brazil, suggests initial speciation.

Macrobrachium amazonicum

Macrobrachium amazonicum is the freshwater decapod of the greatest economic importance in the Eastern South American subcontinent Maciel and Valenti, Studies of natural populations of M. The bait used for this sample was crushed corn and viscera of fish, similar to that used by most sport fishermen.


When reproductive and morphometric traits are compared with literature data from estuarine and inland populations living in the Amazon and Orinoco plains, shrimps from the Pantanal show conspicuous peculiarities differing from other populations: Amazonixum shrimps from estuarine and Amazonian habitats have been studied in great detail, very little is known about hololimnetic inland populations. In general chelipeds were greenish and terminal segments carpus, propodus and dactyl more intensely moss green coloured.

Research and Management, vol. Japanese Journal of Ecology, vol. Laboratory life history of the palaemonid amzzonicum Macrobrachium amazonicum Heller, Decapoda, Palaemonidae. After the hatching, the larvae were siphoned and madrobrachium.

University of Southern California Press. Contributions to Zoology, vol.

The presence of these morphotypes in a species suggests that they guard and defend females during mating interactions Thiel et al. This study records, for the first time, the occurrence of all four male morphotypes in a population of Macrobrachium amazonicum from a continental environment, with an entirely freshwater life cycle.

Significant differences were found among all morphotypes, but CC vs. This may be due in part to a 2.