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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As expected, the backcalculated lengths were shorter than those observed, the differences decreasing with age Table 1. In this work, Hemisorubim platyrhynchos from three isolated populations were cytogenetically analyzed. Linear hemisoribim satisfactorily described the relation between these variables Fig.

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Porthole shovelnose catfish – Wikipedia

International Edition, pp. Integrated Taxonomic Information System. C-banding revealed positive bands in the pericentromeric regions of some chromosome pairs and on the short arms of a st chromosome pair, coincident with positive C-bands and allowed the identification of a large biarmed marker pair with positive bands on almost the entire short and long arms Fig.

This chromosome pair could be considered a species-specific cytogenetic marker, as it has not been reported in other Pimelodidae Fig.

Services on Demand Journal. Received Feb 21; Accepted Platyryhnchos Despite its wide distribution, average abundance, and importance in ecosystem functioning and regional fishery, little is known about the biology of this species. C-banding revealed a small amount of heterochromatin platyrhhnchos chromosomes, including the NORs, and one biarmed pair that showed conspicuous positive bands on both arms. Because the confidence intervals overlapped, they were considered statistically the same.

The fish, which came from commercial and experimental fisheries, were all caught with hook and line. All three populations of Hemisorubim platyrhynchos presented the same results.


Because of the limited number of observations, which would lead to a significantly imbalanced analysis and reduce the power of the F test, the ANOVA test was conducted excluding age 7. Suggestion of a Cytotaxonomical Classification. Geneticand Molecular Research 4 4: Owing to the low number of observations, the test was conducted on seasonal MI of individuals having 2 or 3 rings. The Porthole Shovelnose Catfish, Hemisorubim platyrhynchosis the sixth largest pimelodidae of the Pantanal.

The meat of this species is highly valued. The results indicated that the pectoral fin-spines of H. Abstract 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.

To circumvent the problem created by the reabsorption of the first growth ring Casselman,an ANOVA was performed. Evidences obtained from conventional Giemsa staining, C- and G- banding. Published online Apr Porthole shovelnose catfish Scientific classification Kingdom: This fish reaches a length of The b value, estimated at 3. 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.

Details about data analyses can be found in Penha and Penha et al.

Siluriformesand catalogue of Siluriform primary types. Whereas double marks usually appeared between the first and second rings, false marks were common between the second and fifth rings.

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Porthole shovelnose catfish

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. In the Pantanal, the Rosa-Lee phenomenon detected in this study probably results from fishing regulations, which determine, among other things, minimum catch sizes.


Cytogenetic and Cell Genetic How hemisoruubim cite this article. Pimelodidaewith an uncommon large Y chromosome. 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.

The Von Bertalanffy growth model Bertalanffy, was adjusted to the age data. The AgNORs were located in the terminal position platyrhyncchos the short arm of a subtelocentric st pair Figs 2a, b. Cytogenetic and Genome Research 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. Until now only one population hemmisorubim Hemisorubim platyrhyncjos 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.

The estimated growth parameters indicate that the species presents a relatively slow growth rate. This fish is considered one of the “sorubimine” catfishes, an informal group of catfish that includes genera such as SorubimPseudoplatystomaand Brachyplatystoma. I ; Mateus, L. In some cases, rapid growth zones were more translucent.

In short, a positive relation was found between the fin-spine ring number and the size of the individuals. Fish mortality is therefore size-dependent, with fast-growing individuals caught before the others, which can explain the presence of the Rosa-Lee phenomenon in this study.

Backcalculated lengths indicated the presence of the Rosa-Lee phenomenon in the analyzed hemisotubim. This fact suggests the presence of the Rosa-Lee phenomenon Lee,apud Ricker, Metaphases of Hemisorubim platyrhynchos showing sequential Giemsa-C banding a, b and after Alu I treatment c.