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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Thus, annual growth ring formation in the species under study here appears to be associated with migration that takes place during the receding period, when the fish leave the flooded areas and return to the river channel Ferraz de Lima, Suggestion of a Cytotaxonomical Classification. Hemisorubim platyrhynchos is a medium- to large-sized pimelodid catfish distributed along several river basins of the Neotropical Region, noteworthy for representing an important fishery source.

Human uses

The objective of the present study was to describe the karyotypic structure of specimens from three populations of Hemisorubim platyrhynchos aiming to characterize andcompare the obtained results with the available cytogenetic data on this and other related species. The porthole shovelnose catfish or spotted shovelnose catfishHemisorubim platyrhynchosis the only species in the genus Hemisorubim of the catfish order Siluriformes family Pimelodidae. This fact was also evidenced when using other banding techniques, such as RE Alu Iand indicates that this hemosorubim constitutes a species-specific cytogenetic marker.

Ostariophysi ; historical overview and synthesis of hypothesis. From Wikipedia, the free encyclopedia. Although no differences between sessions were detected through the Kruskal-Wallis test, 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 Additional information platyhrynchos the study area is given in Penha and Penha et al.


We report here on the age and growth of H. Pimelodidae platyrhynchoz, with an uncommon large Y chromosome. The Alu I restriction enzyme shows bands that resemble C-banding, principally on the biarmed chromosome, producing a reverse pattern Fig. The hmisorubim used in this study included individuals with FL varying from 26 to 64 cm.

Analysis of the relative marginal increment by the Kruskal-Wallis test did not indicate the period of growth ring formation of H. Its body shape and color pattern are adapted to the muddy bottom where it stays.

Porthole shovelnose catfish

Because the hemisogubim intervals overlapped, they were considered statistically the same. Published online Apr Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form. Breeding and sexing information have not been hemisorbuim. Most studies undertaken so far have founded evidence of ring formation during the dry season Fenerich et al.

Universidad Nacional del Nordeste. This fish is considered one of the “sorubimine” catfishes, an informal group of catfish that includes genera such as SorubimPseudoplatystomaand Brachyplatystoma.

The growth rate reduction and consequent growth ring formation have generally been associated with temperature, environmental retraction effects during the dry season, reproduction Welcome,and migration Brett, Metaphases of Hemisorubim platyrhynchos showing sequential Giemsa-C banding a, b and after Alu I treatment c.

Journal du Conseil The results suggest that fork length is a good predictor of age for individuals of this species. Analyses of the residual plattrhynchos 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: United States of America.

Hemisorubim platyrhynchos: A More Manageable Shovelnose Catfish

The Porthole Shovelnose Catfish, Hemisorubim platyrhynchosis the sixth largest pimelodidae of the Pantanal. Progressive Fish-Culturist However, it should be noted that it was fairly difficult to identify the rings on the edge of the spine in individuals with more than five rings.

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Although few studies compare the age determined by 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, Karyotype of Hemisorubim platyrhynchos.

This article has been cited by other articles in PMC. Many hard structures have been used to determine the age of pimelodidae. Hemisorubim platyrhynchos Valenciennes Hemisorubim BleekerSpecies: However, first-year growth is rapid.

This pattern differs from the one normally found for Pimelodidae inhabiting river-floodplain systems. Among these, otoliths, vertebrae, and fin-spines are the structures that have produced the best results Fenerich et al. The accumulated amount of fish landed from to was 50 tons Catella, Platystoma platyrhynchos Valenciennes, Despite its wide distribution, average abundance, and importance in ecosystem functioning and regional fishery, little is known about the biology of this species.

Geneticand Molecular Research 4 4: The AgNORs were located in the terminal position on the short arm of a subtelocentric st pair Figs 2a, b.

This had been expected since, from the sixth growth mark on, identifying the edge rings plqtyrhynchos to become increasingly difficult Casselman, We are grateful to an anonymous reviewer for advice and comments on a draft.

Os exemplares provieram da pesca comercial e experimental com linha e anzol. Fisheries Management and Ecology ,