Jaime Fernando González

• M.V., M.Sc., Ph.D.
• Professor (Full) at National University of Colombia

Mesenchymal neoplasms are relatively uncommon in fish as compared to epithelial tumors. A specimen of goldfish (Carassius auratus) (51.7 g weight and 18 cm total length) was submitted by her owner for clinical evaluation to the laboratory of Aquatic Toxicology and Fish Medicine, School of Veterinary Medicine and Animal Science, Universidad Nacional...

Glyphosate is widely used in Colombia to control illegal crops such as poppy and coca plants as well as weeds of edible crops. Acute (96-h), glyphosate exposures (as Roundup ®) in different finfish species of importance in Colombia determined from mild to severe central nervous system (CNS) effects and changes in plasma and brain cholinesterases (A...

Background: routine practices such as biometrics, transportation and medical procedures are a source of stress to fish. The use of anesthetics is recommended to reduce undesirable effects of stress, such as decreased feed intake and even mortality -in critical cases. Objective: the aim of this study was to determine the anesthetic efficacy of euge...

Biomarkers of exposure to contaminants in three catfishes of Colombia Catfishes are one of the most abundant fish groups in Colombia accounting for 36% of them. However, 44% of the vulnerable and threatened fish species of the country belongs to the order Siluriformes. To evaluate biomarkers of exposure to contaminants, a total of 112 specimens of...

Colombia´s government is fostering the mining industry as a cornerstone for economic growth. Sodium cyanide (NaCN) is used in the gold extraction process, which brings up concerns due to likely water pollution and toxic effects on fish. Six experiments were performed with juveniles (n=6-8 fish/treatment) of red tilapia (Oreochromis sp.), Nile tilap...

Anesthetics are needed for fish handling, shipping and surgical procedures. Eugenol (2-methoxy-4-(2-propenyl) phenol) is a phenylpropanoid obtained from clove oil and benzocaine is an ethyl ester derived from PABA. Thirty juveniles of red tilapia (56.3 g body weight, 14.3 cm total length) were randomly assigned to 3 treatments: eugenol 50 ppm, euge...

Ejemplares adultos de capitán de la sabana (Eremophilus mutisii), bagre rayado (Pseudoplatistoma orinocoense) y capaz (Pimelodus grosskopfii) (n=8-25/especie) fueron muestreados en zonas aledañas a Suesca (Cundinamarca), Puerto López (Meta) y represa de Betania (Huila), respectivamente; para investigar niveles de plomo en sangre, actividad colinest...

Los plaguicidas representan uno de los mayores riesgos de contaminación para las aguas en Colombia. Históricamente, nuestro país ha utilizado una gran variedad de productos para controlar insectos, malezas y otras plagas que afectan a humanos, animales y vegetales. Por ello, Colombia es en Latinoamérica uno de los mayores consumidores de estos comp...

El propósito fundamental de este texto de PRINCIPIOS DE TOXICOLOGÍA VETERINARIA es facilitar y complementar el aprendizaje y repaso de esta área del conocimiento por parte del estudiante y el profesional de la Medicina Veterinaria. Adicionalmente, el texto busca llegar a profesionales de áreas afines que tengan interés particular en las temáticas t...

The determination of cholinesterase (ChE) activity in domestic animals is of great importance for diagnosis and research purposes. The present work was aimed to determine the baseline plasma ChE activities (acetylcholinesterase, AChE and butyrylcholinestarase, BChE) of Argentine saddle horses sampled from equine farms of Bogota (Colombia) and its s...

Objective: Considering the high use of pesticides in Colombia and the harmful effects resulting from exposure to these substances on human health and the environment, a study for the determination of biomarkers of exposure and effect of pesticides in population of the banks of the Río Bogotá in Suesca, the levels of pesticides in river water sample...

Fenthion is an organophosphate insecticide used worldwide that may pollute waters after its application causing potential problems in public health and poisoning in domestic and wildlife animals. Objective: to evaluate toxic effects, butyrylcholinesterase activity (BChE) and use in environmental monitoring, 34 juveniles of white cachama (Piaractus...

El éxito de una terapia farmacológica aplicada en peces depende de varios factores. Dentro de éstos se incluyen el diagnóstico preciso del agente causal y de la enfermedad derivada de su acción, las propiedades del fármaco utilizado, las condiciones ambientales en las cuales se lleva a cabo el tratamiento (entre éstas el tipo de sistema en el cual...

Liver microsomes from market-size (n = 6) rainbow trout, channel catfish and tilapia were used to investigate in vitro biotransformation kinetics of albendazole (ABZ). ABZ was transformed to a single metabolite, ABZ sulfoxide (ABZ-SO). Catfish displayed the highest maximal velocity (V(max) = 264.0 +/- 58.6 pmols ABZ-SO/min/mg protein) followed by t...

Heavy metal accumulation of lead (Pb), chromium (Cr), and cadmium (Cd) in the muscle of the catfish Eremophilus mutisii was studied in 47 specimens, captured by anglers in the Bogotá River at two sampling sites (Chocontá and Suesca) during May-October 2005. Water samples were processed for physicochemical and metal analyses. Metal accumulation in m...

Hepatic microsomes and cytosols of channel catfish (Ictalurus punctatus), rainbow trout (Oncorhynchus mykiss), Atlantic salmon (Salmo salar), red tilapia (Oreochromis sp.), largemouth bass (Micropterussalmoides), striped bass (Morone saxatilis), hybrid striped bass (M. saxatilis x M. crysops), and bluegill (Lepomis macrochuris) (n=8) were used to s...

el estrés oxidativo inducido por diversas clases de contaminantes como mecanismo de toxicidad ha sido un foco de interés en el campo de la toxicología acuática y ambiental durante la última década. numerosas evidencias indican que muchos de estos agentes con-taminantes al llegar a cuerpos de agua pueden desencadenar el proceso de estrés oxidativo e...

Resumen Se evaluó a través de métodos analíticos alternos y mediciones de varios observadores la confiabilidad en la cuantificación de pH, nitrito (NO 2), amoniaco (NH 3) y oxígeno disuelto (O 2) en aguas utilizando el kit Fish Farming FF1A ® (Hach). El análisis de NH 3 tuvo el mayor coeficiente de variación (CV = 15,2) cuando diferentes observador...

The effects of waterborne nitrite (3 mg/l NO2) on channel catfish were studied to evaluate changes in hematological parameters and phase I-II biotransformation in liver slices. Nitrite-exposed fish had significantly higher methemoglobin, blood and liver nitrite, and significantly lower pO2 than control fish. Total phase I-mediated metabolism of 7-e...