Hemisorubim platyrhynchos: A More Manageable Shovelnose Catfish. Author: Seth Gibson. GIBS Photographer: Aaron Norman. Monster cats can reach several . Braz J Biol. Nov;64(4) Epub Mar 2. Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal. Hemisorubim platyrhynchos is a medium- to large-sized pimelodid catfish distributed along several river basins of the Neotropical Region.

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Hemisorubim Bleeker Open in a separate window. Views Read Edit View history. Integrated Taxonomic Information System.

Analyses of the relation between the number of rings, fin-spine size, and FL showed that the spine rings were indicators of the fish’s growth. Thus, only data from the readings of these fin-spines were considered reliable and used in th subsequent analyses. The analysis of growth data along the edge of the spines marginal increment – MI by a statistical test did not determine ring-formation periodicity.

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Journal of the Limnological Society of South Africa8: Details about data analyses can be found in Penha and Penha et al. This pattern differs from the one normally found for Pimelodidae inhabiting river-floodplain systems. Breeding and sexing information platyrhynhcos not been reported.

The b value, estimated at 3. The mean length hemisorubom in the cohort’s first year of life, shown in column FL 1 of Table 1decreased with the age of the cohort from which it was estimated, the only exception being the most recent cohort.

Because the confidence intervals overlapped, they were considered statistically the same. Geneticand Molecular Research 4 4: Support Center Support Center.


Platystoma platyrhynchos Valenciennes, This increased the reliability of the readings taken from fin-spine rings. Until now only one population of Hemisorubim platyrhynchos of the Parana River Brazil has been cytogenetically studied and has had its diploid number, AgNORs location and C-banding reported Martins-Santos et al.

However, even in such cases the growth rings were clearly visible. Brazilian Journal of Genetics 11 4: Karyotype of Hemisorubim platyrhynchos. Individual life span was estimated at Journal List Comp Cytogenet v. This chromosome pair could be considered a species-specific cytogenetic marker, hemisoeubim it has not been reported in other Pimelodidae Fig. C-banding revealed a small amount of heterochromatin in chromosomes, including the NORs, and one biarmed pair that showed conspicuous positive bands on both arms.

Although few studies compare the age determined hemisorublm various structures of the same sample, preliminary data indicate that age underestimations tend to result when based on pectoral fin-spines in comparison with those based on dorsal spines Layher, and vertebrae Clay, This article has been cited by other articles in PMC.

The Alu I restriction enzyme shows bands that resemble C-banding, principally on the biarmed chromosome, producing a reverse pattern Fig. This had been expected since, from the sixth growth mark on, identifying the edge rings tends to become increasingly difficult Casselman, The mean age t mean was 2.

In other projects Wikimedia Commons. Most studies undertaken so far have founded evidence of ring formation during the dry season Fenerich et al. Journal du Conseil We are grateful to an anonymous reviewer for advice and comments on a draft.

All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. We report here on platyrgynchos age and growth of H.


Analyses of the residual variances and coefficients of determination indicated that the relationship between the Rz and FL of the spines could be described consistently by several models r 2 of models: Services on Demand Journal. The results indicated hemisoruubim the pectoral fin-spines of H.

During the period of legally prohibited fishing between November and February44 additional specimens were collected for research purposes.

The mean size FL mean of the sampled individuals was hemisrubim Universidad Nacional del Nordeste. This fact was also evidenced when using other banding techniques, such as RE Alu Iand indicates that this pair constitutes a species-specific cytogenetic marker.

Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal.

Age and growth of hemisorbuim porthole shovelnose catfish Hemisorubim platyrhynchos in the Pantanal. Even so, indirect evidence suggests that the pectoral fin-spines of H.

The chromosomes were classified according to their arm ratios as metacentrics msubmetacentrics smsubtelocentrics stand acrocentrics a Levan et al.

The sample used in this study included individuals with FL varying from 26 to 64 cm. The AgNORs were located in the terminal position on the short arm of a subtelocentric st pair Figs 2a, b.

Os exemplares provieram da pesca platyrhyncbos e experimental com linha e anzol.