Recibido en junio de 1997; aceptado en marzo de 1998 RESUMEN Se presenta el análisis del contenido estomacal de 500 dorados, Coryphaena hippurus, capturados por pesca deportiva entre la línea de costa y 25 millas afuera, frente a Cabo San Lucas, Baja California Sur, México. Se identificaron 51 organismos presa en el componente trófico del dorado, los cuales pertenecen a tres grandes grupos: peces, cefalópodos y crustáceos, representando en orden del índice de importancia relativa el 56.3%, 23.1% y 20.6%, respectivamente. De las 51 presas, 18 registraron el 97%. En particular, Dosidicus gigas, Pleuroncodes planipes, Balistes polylepis, Cypselurus callopterus y Auxis spp. aportaron el 70% del componente alimentario. Se describe al dorado como una especie altamente voraz, con un espectro trófico amplio y de hábitos alimentarios estrechamente ligados con el ambiente epipelágico. ABSTRACTThe analysis of the stomach contents of 500 dolphinfish Coryphaena hippurus is presented. The tish were caught from the shoreline to 25 miles off Cabo San Lucas, Baja California Sur, Mexico. Fifty-one prey were identifíed from the food items of the dolphinfish, which pertain to three categories: fishes, cephalopods and crustaceans and, according to the index of relative importance, represent 56.3%, 23.1% and 20.6%, respectively. Of the 5 1 prey, 18 represented 97%. Dosidicus 253
Background: Exercise and physical activity (PA) are essential components of the care of cystic fibrosis (CF) patients. Lower PA levels have been associated with worse pulmonary function, aerobic fitness, glycemic control, and bone mineral density. Most people with CF do not engage in the recommended amounts of PA. Objective: To determine the level of PA in children and adolescents with CF. Methods: A systematic review with meta-analysis was conducted without language restrictions in five databases. Were included studies that analyzed PA measured by objective and subjective instruments in children and adolescents with CF. Two independent reviewers analyzed the studies, extracted the data, and assessed the quality of evidence. The risk of bias of the included studies was assessed with the National Heart, Lung, and Blood Institute's risk-of-bias tool. Results: Of the 1535 reports returned by the initial search, 20 articles reporting on 785 patients were included in the data synthesis. The forest plot showed that the CF group had a similar moderate-to-vigorous PA (MVPA) (mean difference, −7.79; 95% CI, −15.65 to 0.08 min/d; P = .05) and sedentary time (mean difference, −50.81; 95% CI, −109.96 to 8.35 min/d; P = .09) to the control group. Conclusion: Children and adolescents with CF have a similar MVPA and sedentary time compared to controls. There are many options, subjective and objective, for assessing PA in this population. Optimal tool selection should guarantee more valid results.
The first check-list of fishes from Cerralvo Island, Baja California Sur, Mexico, is reported here. A total of 174 species, belonging to 132 genera and 70 families were registered. This list includes species collected and observed in the area between 1990 and 1993, as well as species previously reported in the literature between 1944 and 1993. Cerralvo Island has 77 species from the Panamic Province, 52 with a wide distribution in the eastern Pacific, 14 from the Mexican Province, 12 from the California Province, 5 species endemic of the Gulf of California and 14 species with Indo-Paciflc aftinity, including Gymnomuraena zebra, Heteropriacanthus cruentatus, Thalasoma grammaticum, Acanthurus triostegus, Scarus ghobban, Scarus rubroviolaceus, Zanclus cornutus, Arothron meleagris, Lutjanus viridis, Ostracion meleagris and Chaetodon falcifer.
Se obtuvo el desove de dos hembras silvestres de la cabrilla sardinera, Mycteroperca rosacea, mediante el uso de la hormona Gonadotropina Coriónica Humana (HCG) inoculada en dos dosis: la primera de 1000 UI/kg y la segunda de 500 UI/kg, separadas por 24 h. De las cuatro hembras tratadas, dos tuvieron una respuesta positiva al desove, liberando aproximadamente 40,000 huevos/pez, que fueron fecundados con el esperma de los machos que se encontraban maduros. La tasa de fecundación obtenida de las dos hembras fue de 10% y 0%. Se describe el desarrollo embrionario completo, así como las características morfológicas de los huevos y las larvas hasta la primera alimentación. Los huevos esféricos, transparentes y pelágicos, presentaron un diámetro de 872.8 ± 15.4 µm (rango de 850.4 a 912.5 µm) y una gota lipídica con un diámetro de 177.3 ± 7.0 µm.
Se presentan los resultados obtenidos del estudio de la composición, abundancia y riqueza específica de peces capturados durante 1987, en el área de bahía Concepción, B.C.S. Se analizaron 822 ejemplares correspondientes a 30 familias, 50 géneros y 59 especies, con un peso total de 440.62 kg. Se determinaron nueve especies dominantes que caracterizan a la comunidad: Nematistius pectoralis, Kiphosus elegans, Gerres cinereus, Scomberomorus concolor, Calamus brachysomus, Scomberomorus sierra, Haemulon steindachneri, Trachinotus rhodopus y Mugil cephalus. El área de estudio presenta heterogeneidad de ambientes, lo cual tiende a permitir una gran riqueza específica. Despues de una revisión exhaustiva de la bibliografía sobre el tema, se incluye una lista sistemática total, integrada por 212 especies, que provienen de la ictiofauna registrada por diferentes autores en el periodo de 1944 a 1992 y las capturadas en este trabajo.
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