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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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Published online Apr This fact suggests the presence of the Rosa-Lee phenomenon Lee,apud Ricker, On the other hand, C-banding allowed the identification of a large biarmed pair with positive bands on almost the entire short arm and on hemjsorubim long arm. 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 platyrhynvhos Fig.

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The last procedure produced a life expectancy estimate longevity of Author information Article notes Copyright and License information Disclaimer. The genus Hemisorubim is a monospecific member of the Pimelodidae hemisorubij. The results suggest that fork length is a good predictor of age for individuals of this species.

Hemisorubbim platyrhynchos Valenciennes Journal du Conseil Siluriformesand catalogue of Siluriform primary types. A visual analysis of the box plot between the fin radius and ring number indicated that the larger spines contained more rings Fig.

Mitotic and Meiotic analysis. Analysis of the relative marginal increment by the Kruskal-Wallis test did not indicate the period of growth ring formation of H. The accumulated amount of fish landed from to was 50 metric tons.


Idade e crescimento do jurupoca Hemisorubim platyrhynchos no Pantanal. 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: Fisheries Management and Ecology Fraser-Lee’s equation, which was used to perform backcalculations, produced consistent results.

Porthole shovelnose catfish – Wikipedia

The sample used in this study included individuals with FL varying from 26 to 64 cm. Slow-growing individuals may reach this size only when they are older 3 or more rings.

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

Until now only one population of Hemisorubim platyrhynchos of the Plattyrhynchos River Brazil has been cytogenetically studied and has had its diploid number, AgNORs location and C-banding reported Martins-Santos et al. Brazilian Journal of Biology 64 4: The results indicated that the pectoral fin-spines of H.

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

However, the sharp decline in the MI value recorded during the receding period suggests that rings probably form during this period.

However, first-year growth is rapid. In the southern Pantanal, landing data, including professional and recreational fishing results forrecorded 7. Several hypotheses have been advanced to explain this phenomenon, the main ones being: Journal List Comp Cytogenet v.

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, Experimental Cell Research Details about data analyses can be found in Penha and Penha ppatyrhynchos al.


Many hard structures have been used to determine the age of pimelodidae. We are grateful to an anonymous reviewer for advice and comments on a draft. In some cases, rapid growth zones were more translucent. Whereas double marks usually appeared between the first and second rings, hemusorubim marks were common between the second and fifth rings. From Wikipedia, the free encyclopedia. The mean length reached in the cohort’s first year of life, shown in column FL 1 of Table 1 playrhynchos, decreased with the age of the cohort from which it was estimated, the only exception being the most recent cohort.

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

Karyotype of Hemisorubim platyrhynchos. The Alu I restriction enzyme shows olatyrhynchos that resemble C-banding, principally on the biarmed chromosome, producing a reverse pattern Fig. 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.

The relatively low amount of heterochromatin in chromosomes of Hemisorubim platyrhynchos andin other species of the Pimelodidae catfishes suggests that this may be a characteristic of this family. Integrated Taxonomic Information System.