Boletin Del Instituto De Investigaciones Bibliograficas
ABSTRAer: Haematocrit values, haemoglobin concentration, erythrocyte counts, leucocyte counts, me... more ABSTRAer: Haematocrit values, haemoglobin concentration, erythrocyte counts, leucocyte counts, me an corpuscular volume, mean corpuscular haemoglobin, mean corpuscular haemoglobin concentratlon and plasma protein concentration of 40 specimens of Orthopristis rubu (17 males and 23 females) we re investigated. There were no significant differences in any blood parameter between males and fema les. The variations in haematological parameters in reJation to the size and weight of the fLSh were also examined, and severaJ significant correlation!! were established. Variation!! correlatcd with maturity of gonads were apparent RESUMEN: Se investigaron valores de hematocrito, concentración de hemoglobina. conteos de eritroci tos, y leucocitos, volumen corpuscular medio, hemoglobina corpuscular media. concentración corpuscu lar media de hemoglobina y concentración de proteína plasmática de 40 especbnenes de Ortltopristis ruber (17 machos y 23 hembras). Jl;v se detectaron diferencias sign...
Page 1. KARYOTYPES OF VENEZUELAN TOODFISH 1 INTRODUCTION The family Batrachoididae comprises thre... more Page 1. KARYOTYPES OF VENEZUELAN TOODFISH 1 INTRODUCTION The family Batrachoididae comprises three sub-families and about 55 species (Nelson, 1984). Six species of batrachoid fishes in four different genera ...
RESUMEN Se evaluó el efecto de la masa corporal sobre el consumo de oxígeno del híbrido de tilapi... more RESUMEN Se evaluó el efecto de la masa corporal sobre el consumo de oxígeno del híbrido de tilapia roja, Oreochromis sp., en agua de mar a 38 ups (29,3ºC). Los peces, con peso entre 0,97 y 8,14 g, fueron machos por reversión hormonal. La aclimatación al agua de mar se realizó aumentando la salinidad a razón de 5 ups/día. Las respirometrías se realizaron individualmente en cámaras de 4 L con un flujo de 20 ± 2 mL/min. El nivel de oxígeno se determinó cada hora y durante 3 h, luego de una hora de aclimatación a las condiciones experimentales. Siguiendo el protocolo de transferencia descrito se obtuvo un 100% de sobrevivencia. La tasa metabólica (media ± D.E., n = 40) fue de 0,724 ± 0,053 mL O 2 durante la primera hora; 0,942 ± 0,066 mL O 2 durante la segunda y 1,116 ± 0,076 mL O 2 durante la tercera. Hubo diferencias muy significativas (p<0,01) del consumo de oxígeno entre horas, observándose una tendencia a la estabilización. Se obtuvo una relación directa entre la tasa metabólica...
This paper describes the karyotype analysis of Haemulon aurolineatum, Haemulon bonariensis and Ha... more This paper describes the karyotype analysis of Haemulon aurolineatum, Haemulon bonariensis and Haemulon plumierii, by Giemsa staining, C-banding, Ag-staining and fluorescent in situ hybridization (FISH), to locate the 18S and 5S rRNA genes. Diploid modal count in the three species was 2n = 48 acrocentric elements. Except for pair 24, which exhibited an unmistakable secondary constriction in all three species, it was not possible to classify them as homologous to each other because differences in chromosome size were too slight between adjacent pairs within a size-graded series. Ag-NOR clusters were located in pair 24 in the three species with signal located on the secondary constriction of these chromosomes. C-banding demonstrated that the three species share the same distribution pattern of the constitutive heterochromatin with centromeric heterochromatic blocks in the 23 chromosome pairs and a pericentromeric block in pair 24 which is coincident with the NORs. FISH experiments showed that 18S rDNA sequences were located coincident with the Ag-NOR site in the three species; however, differences in both the number and chromosome distribution of 5S-rDNA cluster were detected among them. Our data suggest that chromosome evolution of Haemulon has been preserved from major changes in the karyotypic macrostructure, whereas microstructural changes have occurred.
The original description of Mugil gaimardianus has created various taxonomic problems in the past... more The original description of Mugil gaimardianus has created various taxonomic problems in the past since the description is ambiguous and the type specimen is apparently lost. The name M. gaimardianus could not be reliably applied to any known species and was suppressed by the International Commission on Zoological Nomenclature (ICZN) (Bulletin of Zoological Nomenclature, 51: 286–287, 1994). Nevertheless, karyological evidence has shown that there is a species of mullet in Venezuelan coastal waters that does not conform to the description of any other mullet from the Western Central Atlantic and has the feature of a red eye that was often used by earlier authors to define nominal M. gaimardianus. The purpose of this study was to make a morphological description of these unusual specimens, provide a morphological diagnosis from other species of Mugil present in the Caribbean and Western Central Atlantic and establish a valid name for the species.
Boletin Del Instituto De Investigaciones Bibliograficas
ABSTRAer: Haematocrit values, haemoglobin concentration, erythrocyte counts, leucocyte counts, me... more ABSTRAer: Haematocrit values, haemoglobin concentration, erythrocyte counts, leucocyte counts, me an corpuscular volume, mean corpuscular haemoglobin, mean corpuscular haemoglobin concentratlon and plasma protein concentration of 40 specimens of Orthopristis rubu (17 males and 23 females) we re investigated. There were no significant differences in any blood parameter between males and fema les. The variations in haematological parameters in reJation to the size and weight of the fLSh were also examined, and severaJ significant correlation!! were established. Variation!! correlatcd with maturity of gonads were apparent RESUMEN: Se investigaron valores de hematocrito, concentración de hemoglobina. conteos de eritroci tos, y leucocitos, volumen corpuscular medio, hemoglobina corpuscular media. concentración corpuscu lar media de hemoglobina y concentración de proteína plasmática de 40 especbnenes de Ortltopristis ruber (17 machos y 23 hembras). Jl;v se detectaron diferencias sign...
Page 1. KARYOTYPES OF VENEZUELAN TOODFISH 1 INTRODUCTION The family Batrachoididae comprises thre... more Page 1. KARYOTYPES OF VENEZUELAN TOODFISH 1 INTRODUCTION The family Batrachoididae comprises three sub-families and about 55 species (Nelson, 1984). Six species of batrachoid fishes in four different genera ...
RESUMEN Se evaluó el efecto de la masa corporal sobre el consumo de oxígeno del híbrido de tilapi... more RESUMEN Se evaluó el efecto de la masa corporal sobre el consumo de oxígeno del híbrido de tilapia roja, Oreochromis sp., en agua de mar a 38 ups (29,3ºC). Los peces, con peso entre 0,97 y 8,14 g, fueron machos por reversión hormonal. La aclimatación al agua de mar se realizó aumentando la salinidad a razón de 5 ups/día. Las respirometrías se realizaron individualmente en cámaras de 4 L con un flujo de 20 ± 2 mL/min. El nivel de oxígeno se determinó cada hora y durante 3 h, luego de una hora de aclimatación a las condiciones experimentales. Siguiendo el protocolo de transferencia descrito se obtuvo un 100% de sobrevivencia. La tasa metabólica (media ± D.E., n = 40) fue de 0,724 ± 0,053 mL O 2 durante la primera hora; 0,942 ± 0,066 mL O 2 durante la segunda y 1,116 ± 0,076 mL O 2 durante la tercera. Hubo diferencias muy significativas (p<0,01) del consumo de oxígeno entre horas, observándose una tendencia a la estabilización. Se obtuvo una relación directa entre la tasa metabólica...
This paper describes the karyotype analysis of Haemulon aurolineatum, Haemulon bonariensis and Ha... more This paper describes the karyotype analysis of Haemulon aurolineatum, Haemulon bonariensis and Haemulon plumierii, by Giemsa staining, C-banding, Ag-staining and fluorescent in situ hybridization (FISH), to locate the 18S and 5S rRNA genes. Diploid modal count in the three species was 2n = 48 acrocentric elements. Except for pair 24, which exhibited an unmistakable secondary constriction in all three species, it was not possible to classify them as homologous to each other because differences in chromosome size were too slight between adjacent pairs within a size-graded series. Ag-NOR clusters were located in pair 24 in the three species with signal located on the secondary constriction of these chromosomes. C-banding demonstrated that the three species share the same distribution pattern of the constitutive heterochromatin with centromeric heterochromatic blocks in the 23 chromosome pairs and a pericentromeric block in pair 24 which is coincident with the NORs. FISH experiments showed that 18S rDNA sequences were located coincident with the Ag-NOR site in the three species; however, differences in both the number and chromosome distribution of 5S-rDNA cluster were detected among them. Our data suggest that chromosome evolution of Haemulon has been preserved from major changes in the karyotypic macrostructure, whereas microstructural changes have occurred.
The original description of Mugil gaimardianus has created various taxonomic problems in the past... more The original description of Mugil gaimardianus has created various taxonomic problems in the past since the description is ambiguous and the type specimen is apparently lost. The name M. gaimardianus could not be reliably applied to any known species and was suppressed by the International Commission on Zoological Nomenclature (ICZN) (Bulletin of Zoological Nomenclature, 51: 286–287, 1994). Nevertheless, karyological evidence has shown that there is a species of mullet in Venezuelan coastal waters that does not conform to the description of any other mullet from the Western Central Atlantic and has the feature of a red eye that was often used by earlier authors to define nominal M. gaimardianus. The purpose of this study was to make a morphological description of these unusual specimens, provide a morphological diagnosis from other species of Mugil present in the Caribbean and Western Central Atlantic and establish a valid name for the species.
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Papers by Juan I Gaviria