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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Four samples of 30 minutes were taken monthly, using a trap, from January to April In general, chelipeds had few spines and segments were translucent. Patterns of larval growth and chemical composition in the Amazon River prawn, Macrobrachium amazonicum.

CL, with an estimated size at onset of morphological sexual maturity of 8. When reproductive and morphometric macrobrachiuj 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: There is strong human disturbance here, caused by an excessive external supply of nutrients, such as fish food pelletsviscera of caught fish amqzonicum corn, to attract fish for sport fishing.

Jacrobrachium on Demand Journal. Four groups of males, differing in color,spination pattern and body relationships, were identified. Palaemonidae from the Pantanal, Brazil, suggests initial speciation. In TC prawns, the chelipeds are translucent, whereas in CC they are generally cinnamon-colored.

Size-weight relationships differed significantly between males and females, indicating macrorbachium morphometric differences. Our results supported the hypothesis that coastal and continental populations of M. Spine angle for the four groups. The data referring to total length and weight of all the females, storage date, coloration and number of eggs, macrobgachium and coloration of gonad and number of hatched amazknicum were noted.

From lecithotrophy to planktotrophy: Different biological characteristics were found between the populations studied. A covariance analysis ANCOVA was done to test the linear and angular coefficients among the juveniles and the sequential morphotypes found. A possible explanation for the differences noted is the fact that M. Thus, the passage from one morphotype to another in a natural environment could occur through a single molt.


Changes to lake ecosystem structure resulting from fish cage farm emissions.

Macrobrachium amazonicum is the freshwater decapod of the greatest economic importance in the Eastern South American subcontinent Maciel and Valenti, The following dimensions were measured with a digital caliper 0. Males appear to have a more slender body shape than females, reaching thus lower weight at equal TL.

WoRMS – World Register of Marine Species – Macrobrachium amazonicum (Heller, )

On the biology, origin, and radiation of freshwater-invading shrimp. Significant differences were found among all morphotypes, but CC vs. However, when we compare our results with those obtained by Santos et al.

Biodiversity and Conservation, vol. Research and Management, vol.

Macrobrachium amazonicum – Wikispecies

Morphotypes Variable N mean s. According to this author, in these inland populations, female downstream migrations or a passive larval export to estuarine waters must be considered as biologically impossible, which raises the question if coastal, estuarine, and hololimnetic inland populations assigned to M.

Afterwards, the trap was removed, and the captured material was screened. In this manner, further behavioral studies should be performed to understand the reproductive role of each morphotype, as suggested by Maciel and Valenti The results of the K-means classification were refined by applying a discriminant analysis. Similarly, these two morphotypes presented similar body sizes in the present study, what was also demonstrated by Moraes-Riodades and Valenti All joints presented more setae and spines than TC and CC, while fingers were distinctly velvety pubescent.

In Brazil, the species is intensively amzzonicum by artisanal fisheries; it is also consumed macrobrwchium human food, most commonly in Northeastern Brazil and in the Amazon region, by all social classes Moraes-Valenti and Valenti, ; Marques and Moraes-Valenti, With respect to fertility per weight classes, the lowest number of larvae was and the highest, 1, After identification of the presence of morphotypes, chelipeds of ten animals per group were photographed with a Nikon D digital camera macrobrachlum In this species, sexually mature males can have different morphotypes, which have different sizes, morphology, physiology and behavior.


This raises doubts whether allopatric, ecologically diverse populations belong to the same species. GC2 showed similar allometric coefficient rates Figure 3 and Table 3.

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

With respect to average fecundity F by length classes, the lowest and highest number of eggs observed was and 1, respectively. The DNA barcoding and the caveats with respect to its application to some species of Palaemonidae Crustacea, Decapoda. 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.

How to cite this article. Juvenile prawns had a carapace length CL of 4.

Macrobrachium amazonicum

The prawns were sexed and identified by the presence or absence of the appendix masculina on the second pair of pleopods Valenti, Aquaculture and Research, vol. Laboratory life history of the palaemonid shrimp Macrobrachium amazonicum Heller, Decapoda, Palaemonidae.

The largest carapace length of male specimens of M. Morphologic and morphometric analysis confirmed maazonicum division of male Macrobrachium amazonicum into distinct groups. Freshwater prawns of the genus Macrobrachium Bate, Crustacea: Consequently, we could determine amazonium of these initial variables has more influence on the differentiation of possible morphological categories morphotypes.

Therefore, our hypothesis is that the high degree of plasticity in morphological characters among populations throughout the geographical distribution of M. Our results amazonifum that the natural male population of M. The mean angle and standard deviation were then calculated for each group. 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.

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