Hidrological and population studies on Artemia franciscana in Yavaros, Sonora , México
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Ortega Salas, Adolfo Armando
Martínez G., A.
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Universidad de Costa Rica
Abstract
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El clima en el área de Yavaros es adecuado para la evaporación de agua marina. Es desértico y la estación más seca es la primavera. El ámbito anual de la temperatura es de 15-30°C, la precipitación es de 300-400 mm y la evaporación es de 1,500-2,000 mm. Cada año de junio a enero las salinas de Yavaros forman un habitat natural de reproducción de Artemia.Se muestreó durante el día en septiembre, enero y abril, resultando los siguientes ámbitos: oxígeno disuelto de 0. 1 a 4.0 mL/L, temperatura de 22 a 42°C, salinidad de 66 a 355o/oo, fitoplancton de 15x103 to 56x106 c/L, zooplancton de 10° a 6.8x103 organismos/50 L. Dunaliella, Nitzchia y Oscillatoria fueron las más abundantes en el fitoplancton. Artemia apareció en las 15 salinas, en la mayoría de ellas en septiembre y abril, y podría cultivarse comercialmente. Los copépodos fueron abundantes en algunas muestras.
The climate in the Yavaros area is very suitable for the evaporation of sea water. It is desertic and the driest season is the spring. The annual ranges are: air temperature 15-30°C, rainfall 300-400 mm and evaporation 1,500-2,000 mm.Each year, from June to January, the Yavaros salinas form a natural breeding habitat for Artemia.Daytime samples taken in September, January and April showed the following ranges: dissolved oxygen 0.1 to 4.0 mL/L, temperature 22 to 42°C, salinity 66 to 355o/oo , phyjtoplankton 15 x 103 to 56 x 106 c/L and zooplankton 10 . ' . to 6.8 X 103 organisms/50L L . Dunaliella, Nitzchia and Oscilatoria were the most abundant in the phytoplankto. Artemia occurred in all of the 15 salinas in January and in most of them in September and April. Copepods were common in some samples.The commercial harvesting of Artemia cysts in the Yavaros salinas is suggested.
The climate in the Yavaros area is very suitable for the evaporation of sea water. It is desertic and the driest season is the spring. The annual ranges are: air temperature 15-30°C, rainfall 300-400 mm and evaporation 1,500-2,000 mm.Each year, from June to January, the Yavaros salinas form a natural breeding habitat for Artemia.Daytime samples taken in September, January and April showed the following ranges: dissolved oxygen 0.1 to 4.0 mL/L, temperature 22 to 42°C, salinity 66 to 355o/oo , phyjtoplankton 15 x 103 to 56 x 106 c/L and zooplankton 10 . ' . to 6.8 X 103 organisms/50L L . Dunaliella, Nitzchia and Oscilatoria were the most abundant in the phytoplankto. Artemia occurred in all of the 15 salinas in January and in most of them in September and April. Copepods were common in some samples.The commercial harvesting of Artemia cysts in the Yavaros salinas is suggested.