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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IUCN Red List of Threatened Species
The linear regression analysis for this relationship demonstrated a lower allometric coefficient b for the juveniles when compared to the four subsequent castes Figure 3. According to Ramos et al. A covariance analysis ANCOVA was done to test the linear and angular coefficients among the juveniles and the sequential morphotypes found.
This analysis showed whether the data for each morphological group were better adjusted to a single straight line or if the morphotypes should be represented by different linear equations.
Individual fecundity was determined from the total egg counting, using a stereoscopic microscope.
Juvenile prawns had a carapace length CL of 4. Each male specimen was measured with respect to seven body dimensions as follows: Distinct morphotypes described for this species Moraes-Riodades and Valenti, have been recorded only for coastal populations from culture ponds Papa et al. The DNA barcoding and the caveats with respect to its application to some species of Palaemonidae Crustacea, Decapoda.
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. Palaemonidae from the Pantanal, Brazil, suggests initial speciation.
WoRMS – World Register of Marine Species – Macrobrachium amazonicum (Heller, )
CL, with an estimated size at onset of morphological sexual maturity of 8. In this context, further studies should be conducted to better understand how the environmental factors influence the complete male population structure development of M. Macrobrachium amazonicum is the freshwater decapod of the greatest economic importance in the Eastern South American subcontinent Maciel and Valenti, Significant differences were found among all morphotypes, but CC vs.
March 19, ; Accepted: In this work, the maximum number of larvae observed per hatching for females kept in laboratory was 2, From these results we can deduced that fecundity and fertility of M. Contributions to Zoology, vol. In the analysis of average fertility N per length classes, the lowest and highest number of larvae observed was and 1, respectively.
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. Effect of density on population development in the Amazon River prawn Macrobrachium amazonicum. Freshwater prawns of the genus Macrobrachium Bate, Crustacea: Therefore, our hypothesis is that the high degree of plasticity in morphological characters among populations throughout the geographical distribution of M.
This raises doubts whether allopatric, ecologically diverse populations belong to the same species. This study recorded for the first time, the occurrence of all four male morphotypes of M.
Discussion Morphologic and morphometric analysis confirmed the division of male Macrobrachium amazonicum into distinct macrobracchium. According to these authors, differences in reproductive systems indicate that long vicariant separation has indeed allowed for diversification in different catchment areas, suggesting that M.
June 5, ; Revised: Carapace length ranged from 4. In general chelipeds were greenish and terminal segments carpus, propodus and dactyl more intensely moss green coloured. It was reported that freshwater individuals differ from estuarine individuals in a few essential reproductive characteristics.
The trap was placed near the macrophytes at depths of meters and remained at each site for 30 minutes. Prawns of the CC morphotype had a CL of Nevertheless, these authors mentioned amzaonicum GC2 morphotypes were not captured by them because of the trap used casting net. The authors are indebted to Mr. Morphotypic differentiation of male Malaysian giantprawns, Macrobrachium rosenbergii.
Odinetz-Collartstudying populations of Amazobicum. GC1 and GC1 vs. Population structure of pond-raised Macrobrachium amazonicum with different stocking and harvesting strategies. The palaemonid shrimp Macrobrachium amazonicum shows an unusually large geographic range ca.
As for fecundity by weight classes, the lowest number of eggs observed was and the highest, 1, Research and Management, vol. GC1 animals presented a CL ranging from The results of the K-means classification were refined by applying a discriminant analysis. Different biological characteristics were found between the populations studied.
Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae).
All measurements were based in the method of Kuris et al. Right cheliped length RCL ranged from 9. This may be due in part to a 2.