Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal
The Porthole Shovelnose Catfish, Hemisorubim platyrhynchos, is the sixth largest pimelodidae of the Pantanal. Its age and growth were studied using pectoral fin-spines from fish collected in the Cuiabá river basin, Pantanal. The fish, which came from commercial and experimental fisheries, were all c...
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doaj-157d482065654763beba715d6a33538b2020-11-25T00:35:57ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-437564483384010.1590/S1519-69842004000500013S1519-69842004000500013Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the PantanalJ. M. F. Penha0L. A. F. Mateus1G. Barbieri2Universidade Federal de Mato GrossoUniversidade Federal de Mato GrossoCentro para Estudos de Bacias HidrográficasThe Porthole Shovelnose Catfish, Hemisorubim platyrhynchos, is the sixth largest pimelodidae of the Pantanal. Its age and growth were studied using pectoral fin-spines from fish collected in the Cuiabá river basin, Pantanal. The fish, which came from commercial and experimental fisheries, were all caught with hook and line. Growth-ring formation time could not be defined through the Kruskal-Wallis test on marginal increment (H = 4.142; p = 0.247). Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form. Estimation of the parameters of von Bertalanffy growth curve, adjusted through nonlinear regression to observed fork lengths, with L<FONT FACE=Symbol>¥</FONT> fixed at 64 cm, were: k = 0.222 year-1; t o = -2.149 years. Individual life span was estimated at 11.4 years. The results suggest that fork length is a good predictor of age for individuals of this species.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842004000500013&lng=en&tlng=enporthole shovelnose catfishagegrowthfin-spineHemisorubim platyrhynchosPantanal |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. M. F. Penha L. A. F. Mateus G. Barbieri |
spellingShingle |
J. M. F. Penha L. A. F. Mateus G. Barbieri Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal Brazilian Journal of Biology porthole shovelnose catfish age growth fin-spine Hemisorubim platyrhynchos Pantanal |
author_facet |
J. M. F. Penha L. A. F. Mateus G. Barbieri |
author_sort |
J. M. F. Penha |
title |
Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal |
title_short |
Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal |
title_full |
Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal |
title_fullStr |
Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal |
title_full_unstemmed |
Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal |
title_sort |
age and growth of the porthole shovelnose catfish (hemisorubim platyrhynchos) in the pantanal |
publisher |
Instituto Internacional de Ecologia |
series |
Brazilian Journal of Biology |
issn |
1678-4375 |
description |
The Porthole Shovelnose Catfish, Hemisorubim platyrhynchos, is the sixth largest pimelodidae of the Pantanal. Its age and growth were studied using pectoral fin-spines from fish collected in the Cuiabá river basin, Pantanal. The fish, which came from commercial and experimental fisheries, were all caught with hook and line. Growth-ring formation time could not be defined through the Kruskal-Wallis test on marginal increment (H = 4.142; p = 0.247). Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form. Estimation of the parameters of von Bertalanffy growth curve, adjusted through nonlinear regression to observed fork lengths, with L<FONT FACE=Symbol>¥</FONT> fixed at 64 cm, were: k = 0.222 year-1; t o = -2.149 years. Individual life span was estimated at 11.4 years. The results suggest that fork length is a good predictor of age for individuals of this species. |
topic |
porthole shovelnose catfish age growth fin-spine Hemisorubim platyrhynchos Pantanal |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842004000500013&lng=en&tlng=en |
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