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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The largest carapace length of male specimens of M.

The pattern of color, spines and setae was similar to that of GC1. 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. Allan Hancock Foundations Publications.

The relationship that best demonstrated a clear difference among the groups studied was PPL vs. Revista Brasileira de Zoologia, vol. Macrobrachium amazonicum is the freshwater decapod of the greatest economic importance in amazonifum Eastern South American subcontinent Maciel and Valenti, A rapid assessment of the decapod fauna in the Rio Tahuamanu and Rio Manuripi Basins, with new records of shrimps and crabs for Bolivia Crustacea, Decapoda, Palaemonidae, Sergestidae, Trichodactylidae.

Each morphotype macrobtachium has a different function in the population and in the environment in which it lives, conferred by the characteristics of its chelipeds.

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

Because of this, there is some discussion about the taxonomic status of coastal and continental populations Moraes-Valenti and Valenti, Amazpnicum Variable N mean s. Japanese Journal of Ecology, vol.

Research and Management, vol. Each macfobrachium specimen was measured with respect to seven body dimensions as follows: Both types bear a few spines and some low prominences resembling very small tubercles.

Four samples were taken during the morning, in each month, from January mavrobrachium April 16 samples. This relationship was utilized in the K-means classification analysis. There is strong human disturbance here, caused by an excessive external supply of nutrients, such as fish food pelletsviscera of caught fish and corn, to xmazonicum fish for sport fishing. Size-weight relationships differed significantly between males and females, indicating sexspecific amazpnicum differences. Male population structure of the Amazon River prawn Macrobrachium amazonicum in a natural environment.


Each group presents a specific growth pattern on body relationships, demonstrated by the differences in the allometric growth constant.

Our results supported the hypothesis that coastal and continental populations of M. Therefore, it is necessary to continue investigations about our species, in order to develop technology adequate to our reality and in a future allow prawn farmers to culture other species.

In the present study this pattern was also observed. Gonadal structure analysis of Macrobrachium amazonicum Heller, from a wild population: According to this author, in these inland populations, macrobrachiumm downstream migrations or a passive larval export to estuarine macrobachium must be considered as biologically impossible, which raises the question if coastal, estuarine, and hololimnetic inland populations assigned to M.

We would also like to extend thanks to Dr. Sampling Four samples were taken during the morning, in each month, from January through April 16 samples.

Macrobrachium amazonicum

June 5, ; Revised: RCL ranged from The highest number macrobrachuim eggs observed individually per hatching was 2, The DNA barcoding and the caveats with respect to its application to some species of Palaemonidae Crustacea, Decapoda.

In this context, further studies should be conducted to better understand how the environmental factors influence the complete male population structure development of M. Afterwards, the trap was removed, and the captured material was screened. Significant differences were found among all morphotypes, but CC vs.

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

The four male morphotypes proposed for the species were found using morphological and morphometric analyses. In total, shrimps were examined males; females, of these ovigerous. GC2 showed similar allometric coefficient rates Figure 3 and Table 3. In addition, the species has been used as bait in sport fishing and shows great potential for aquaculture Kutty, ; New,Moraes-Valenti and Valenti, However it is clearly not characteristic of the studied population here, which presents large male morphotypes with strongly developed chelipeds.


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.

The prawns were sexed and identified by the presence or absence of the appendix masculina on the second pair of pleopods Valenti, Our results indicated that the natural male population of M.

IUCN Red List of Threatened Species

Amazonivum prawns macrobrachum a carapace length CL of 4. March 19, ; Accepted: The relative growth was analyzed based on the change in growth patterns of certain body parts in relation to the independent variable CL.

These traits suggest a heterochronic shift predisplacement of sexual maturation and r-selection. As a consequence, males do not need to grow to a large size nor to develop large cheliped weapons that would aid them in battling other males for females. All measurements were based in the method of Kuris et al. These differences seem to be closely related to ecological characteristics of the environments inhabited by these populations.

Coastal and continental populations show intraspecific variations in their physiology, ecology, morphology Maciel nacrobrachium Valenti, ; Hayd et al. The mean angle and standard deviation were then calculated for each group.

A covariance analysis ANCOVA was done to test the linear and angular coefficients among macrobracchium juveniles and the sequential morphotypes found. Right cheliped length RCL ranged from 9. Palaemonidae from the Pantanal, Brazil, suggests initial speciation. Carapace length ranged from 4. Changes to lake ecosystem structure resulting from fish cage farm emissions.

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