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Beltran-Alvarez R.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce | Sanchez-Palacios J.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce | Valdez G.L.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce | Ortega-Salas A.A.,National Autonomous University of Mexico
Revista de Biologia Tropical | Year: 2010

Oreochromis aureus is an important fishing resource in this reservoir but little biological information is available for management purposes. To study its age and growth in the site, we obtained samples using gill nets of six mesh sizes, and collecting fish from commercial catches, on a bimonthly basis, from November 2006 to September 2007. Total length (Lt), total weight (Pt), sex and gonadosomatic maturity were analyzed. Age determination was done by readings of scale growth marks, and its validation was made by the marginal and gonadosomatic index. A total of 384 fish were collected. Length and weight varied from 125 to 345mm and from 40 to 671g, respectively. Growth in length and weight are described by the following von Bertalanffy equations: Lt=416 [1-e-0.3682 (t+0.4975)] and Pt=1323[1-e-0.3682(t+0.4975)]]3.0652. Two growth marks per year were registered, these were associated to metabolic and environmental factors like reproduction and temperature. Source


Beltran-Alvarez R.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce | Ramirez-Lozano J.P.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce | Sanchez-Palacios J.,Laboratorio Of Limnologia Y Pesquerias Of Agua Dulce
Hidrobiologica | Year: 2012

The Picachos reservoir was completed in 2009 impounding the Presidio river, in the southern part of the state of Sinaloa, Mexico, and is located at a height of 75 m above msnmm. He began filling in July of the same year. A limnological study performed with monthly visits to the reservoir between September 2009 and August 2010 showed that it behaves like a warm monomíctic lake, with complete mixing between December and February and thermal stratification during the rest of the year, and with an anoxic hipolimnion during thermal stratification. Source

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