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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This size difference was attributed to differences in the quantity and quality of food, due to the flood cycle. The bait used for this sample was crushed corn and viscera of fish, similar to that used by most sport fishermen. Palaemonidae from the Pantanal, Brazil, suggests initial speciation. These inland populations do not depend on brackish water to complete the larval phase, in contrast of what occurs in coastal populations Guest, Biodiversity and Conservation, vol.

According to these authors, differences macrobrafhium reproductive systems indicate that long vicariant separation has indeed allowed for diversification in different catchment areas, suggesting that M. In Brazil, studies with native freshwater prawn species were discontinued due to great importance of Macrobrachium rosenbergii.

IUCN Red List of Threatened Species

Ocurrence of male morphotypes of Macrobrachium amazonicum Caridea, Palaemonidae in a population with an entirely freshwater life cycle.

Aquaculture and Research, vol.

Juvenile prawns had a carapace length CL of 4. As for fecundity by weight classes, the lowest number of eggs observed was and the highest, 1, It was reported that freshwater individuals differ from estuarine individuals in a few essential reproductive characteristics.

Acta Limnologica Brasiliensia, vol. In contrast, Vergamini et al. Only males were used in the analysis. 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.


While shrimps from estuarine and Amazonian habitats have been studied in great detail, very little is known about hololimnetic inland populations.

Biology Ocurrence of male morphotypes of Macrobrachium amazonicum Caridea, Palaemonidae in a population with an entirely freshwater life cycle. They remain small, cryptic, and highly mobile Bauer, According to Odinetz-Collart and Odinetz-Collart and Moreiraprawns caught in flowing water of large rivers grew to larger sizes than did prawns collected in the lentic water of lakes and reservoirs that can reach sexual maturity at smaller sizes.

Morphotypes Variable N mean s. Our results supported the hypothesis that coastal and continental populations of M. A significant difference between slope parameters of linear regressions describing fecundity, either in terms of numbers of eggs laid or of larvae released, in relation to female fresh weight, indicates egg losses.

The collection site was located downstream of the reservoir of Ibitinga Hydroelectric Power Plant, in a lotic environment with a sandy bottom and marginal vegetation consisting of grasses Cynodondactylon L.

Macrobrachium amazonicum is the freshwater decapod of the greatest economic importance in the Eastern South American subcontinent Maciel and Valenti, Acta Biologica Venezuelica, vol. This population was compared with other continental populations, including a population from the dam itself, collected in a previous study.

Japanese Journal of Amazonicmu, vol. The presence of these morphotypes in a species suggests that they guard and defend females during mating interactions Thiel et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Thus, the passage from one morphotype to another in a natural environment could occur through a single molt. The mean angle and standard anazonicum were then calculated for each group. Additionally, here we compare the sizes and male morphotypes of M. Effect of density on population development in the Amazon River prawn Macrobrachium amazonicum. Morphotypes in male Amazon River Prawns, Macrobrachium amazonicum.


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

The relative growth was analyzed based on the change in growth patterns of certain body parts in relation to the independent variable CL. Nevertheless, these authors mentioned that GC2 morphotypes were not captured by them because of the trap used casting net.

Spine angle for the four groups. Services on Demand Journal. In this manner, further behavioral studies should be performed to understand the reproductive role of each morphotype, as suggested by Maciel and Valenti Maximum body size was larger in natural habitats compared to the pond culture, suggesting reduced growth or a shorter life span under artificial mass rearing conditions.

In total, shrimps were examined males; females, of these ovigerous. With respect to average fecundity F by length classes, the lowest and highest number of eggs observed was and 1, respectively.

Macrobrachium amazonicum

Significant differences were found among all morphotypes, but CC vs. In addition, the species has been used as bait in sport fishing and shows great potential for aquaculture Kutty, ; New,Moraes-Valenti and Valenti, Each male specimen was measured with respect macrobracgium seven body dimensions as follows: According to the allometric coefficients obtained in the morphometric analysis, morphotypes CC, GC1 and GC2 have very similar body size relationships between carapace and propodus Figure 3 and Table 3.

The prawns in this study were collected according to Brazilian laws concerning sampling of wild animals.

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