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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Eds Phylogeny and Classification of Neotropical Fishes. Ichthyological Exploration Freshwaters 16 4: The porthole shovelnose catfish or spotted shovelnose catfishHemisorubim platyrhynchosis the only species in the genus Hemisorubim of the catfish order Siluriformes family Pimelodidae. 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.

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.

Hemisorubim platyrhynchos, Porthole shovelnose catfish : fisheries, aquarium

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

This increased the reliability of the readings taken from fin-spine rings. The fish, which came from commercial and experimental fisheries, were all caught with hook and line.

International Edition, pp. Please review our privacy policy. How to cite this article. However, even in such cases the growth rings were clearly visible. When this phenomenon is present, the mean size calculated for younger fish is smaller the older the fish from which it was estimated Ricker, ; Siluriformesand catalogue of Siluriform primary types.


Idade e crescimento do jurupoca Hemisorubim platyrhynchos no Pantanal. Hence, the individuals of the species would take The purpose hemisogubim this study was to determine the age, adjust the von Bertalanffy growth curve, and estimate the longevity of individuals of the species. The last procedure produced a life expectancy estimate longevity of Details about data analyses can be found in Penha and Penha et al.

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

Brazilian Journal of Biology 64 4: Hemisorubim platyrhynchosPimelodidae, Cytogenetics. This fish is considered one of the “sorubimine” catfishes, an informal group of catfish that includes genera such as SorubimPseudoplatystomaand Brachyplatystoma. Despite its wide distribution, average abundance, and importance in ecosystem functioning and regional fishery, little is known about the biology of this species. Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form.

Services on Demand Journal. The measurements of jurupoca specimens were recorded between July and October All platyrhynchow populations of Hemisorubim platyrhynchos presented the same results.

The estimated growth parameters indicate that the species presents a relatively slow growth rate. Mitotic chromosome preparations hemsiorubim obtained platyrhynchoe to the technique described by Foresti et al. Received Feb 21; Accepted Mar Support Center Support Center.

In some cases, sections revealed grooves crossing the rings. Human Biology Results All three populations of Hemisorubim platyrhynchos presented the same results. Nucleolus organizer regions Ag-NORs were revealed by the silver-staining method Howell and Black and C-banding was performed according to Sumner 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.


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. II ; Barbieri, G. In short, a positive relation was found between the fin-spine ring number and the size of the individuals. Brazilian Journal of Genetics 11 4: 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.

Individual life span was estimated at Suggestion of a Cytotaxonomical Classification. Published online Apr In the southern Pantanal, landing data, including professional and recreational fishing results forrecorded 7. This chromosome pair is clearly identified due to its size, shape and exclusive secondary constriction.

Breeding and sexing information have not been reported. Porthole shovelnose catfish Scientific classification Kingdom: However, the sharp decline in the MI value recorded during the receding period suggests that rings probably form during this period.

The sample used in this study included individuals with FL varying from 26 to 64 cm. 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 adjustment of the Von Bertalanffy model based on backcalculated lengths was more precise than that hemisourbim on lengths observed by age.

Hence, the simplest model, i.

It feeds on benthic organisms and fish Froese and Pauly