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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 platyrhynchos: A More Manageable Shovelnose Catfish

The Platyryynchos variation explained Brazilian Journal of Genetics 4: In other projects Wikimedia Commons. Growth curve parameters were used to estimate longevity of the individuals in stock by the Taylor method Taylor, The Von Bertalanffy model was adjusted both to lengths observed by age and to the backcalculated one.

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. Fisheries Management and Ecology The m, sm, st were considered as biarmed chromosomes and acrocentrics were considered as uniarmed chromosomes. In some cases, sections revealed grooves crossing the rings.

Hemisorubim platyrhynchos, Porthole shovelnose catfish : fisheries, aquarium

Fifteen specimens of Hemisorubim platyrhynchos consisting of 8 males m and 5 females fcaught in the Parana River Corrientes State, Argentina and 2 specimens of undetermined sex from the Miranda River Mato Grosso do Sul State, Brazil were cytogenetically analyzed. I was used a concentration of 0.

However, even in such cases the growth rings were clearly visible. This chromosome pair could be considered a species-specific cytogenetic marker, as it has not been reported in other Pimelodidae Fig. Linear models satisfactorily described the relation between these variables Fig. The family Pimelodidae represents one of the most specious catfish groups, however relationships among species of this group still remain as unanswered questions; however, it seems self-evident that they share certain characteristics NelsonFerraris The mean length reached 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.


In this work, Hemisorubim platyrhynchos from three isolated populations were cytogenetically analyzed. The AgNORs were located in the terminal position on the short arm of a subtelocentric st pair Figs 2a, b. The genus Hemisorubim is a monospecific member of the Pimelodidae family. Geneticand Molecular Research 4 4: This species is rather rare, confined to the deeper and slow-moving parts of large rivers together with some Loricaria and Potamotrygon.

Services on Demand Journal. The fin-spine sections revealed up to 7 rings, representing 7 age groups, with the age class with 3 rings predominating Fig.

However, it should be noted jemisorubim it was fairly difficult to identify the rings on the edge of the spine in individuals with more than five rings.

From Wikipedia, the free encyclopedia. Most studies undertaken so far have founded evidence of ring formation during the dry season Fenerich et al.

Cytogenetic and Cell Genetic Additional details about fin-spine preparation, measurements, ring-reading conditions, and criteria used to identify double and false marks can be found in Penha and Penha et al. Metaphases of Hemisorubim platyrhynchos showing sequential Giemsa-C banding a, b and after Alu I treatment c.

Evidences obtained from conventional Giemsa staining, C- and G- banding. Of these genera, Hemisorubim is most closely related to Pseudoplatystoma. Hemisorubim BleekerSpecies: Ostariophysi ; historical overview and synthesis of hypothesis.


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Although few studies compare the age determined plathrhynchos 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 plafyrhynchos spines Layher, and vertebrae Clay, 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: The chromosomes were classified according to their arm ratios as metacentrics msubmetacentrics smsubtelocentrics stand acrocentrics a Levan et al.

Ichthyological Exploration Freshwaters 16 4: Universidad Nacional del Nordeste. Arrows indicate the NOR- bearing chromosomes. This article has been cited by other articles in PMC. Whereas double marks usually appeared between the first and second rings, false marks were common between the second and fifth rings.

The Alu I restriction enzyme shows bands that resemble C-banding, principally on the biarmed chromosome, producing a reverse pattern Fig.

Porthole shovelnose catfish

These authors detected the formation of two annual growth rings: Hemisorubim platyrhynchosPimelodidae, Cytogenetics. Open in a separate window. Progressive Fish-Culturist The Alu I restriction enzyme onfish chromosomes produces a C-banding-like pattern Maistro et al.

This strategy is common to several Pimelodidae species of South American river-floodplain systems and may be one of the causes of the great abundance of these fish in rivers of the continent.