The Tranca Grande lagoon is one of the systems where the truchiculture is realized, a productive activity which supports the lake since 1995. It is located in the Paramo floor or Tropical Montano in the Department of Junin, Province of Jauja to 4320 m of altitude (11º43’57?S) and (75º13’18? W). The structure and composition of the superficial phytoplanktonic community was studied from monthly samples collected from January to December on 1996 in relation to 21 physical-chemical variables of water. The community showed 51 species belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, Chrysophyta and Pyrrophyta. The highest average values of density were from Gloeocystis gigas and Ulothrix sp. On the rainy months, the rain fall had a considerable influence on the dilution and sedimentation of the macronutrients responsible for the conductivity, alkalinity, hardness, cal...

The Tranca Grande lagoon is one of the systems where the truchiculture is realized, a productive activity which supports the lake since 1995. It is located in the Paramo floor or Tropical Montano in the Department of Junin, Province of Jauja to 4320 m of altitude (11º43’57?S) and (75º13’18? W). The structure and composition of the superficial phytoplanktonic community was studied from monthly samples collected from January to December on 1996 in relation to 21 physical-chemical variables of water. The community showed 51 species belonging to Bacillariophyta, Chlorophyta, Cyanophyta, Euglenophyta, Chrysophyta and Pyrrophyta. The highest average values of density were from Gloeocystis gigas and Ulothrix sp. On the rainy months, the rain fall had a considerable influence on the dilution and sedimentation of the macronutrients responsible for the conductivity, alkalinity, hardness, cal...

El presente trabajo evaluó el efecto de la inclusión dietaría de Chlorella peruviana sobre los parámetros de crecimiento y curvas de incremento de la relación longitud-peso de alevines de Colossoma macropomum. Se prepararon cuatro dietas con diferentes niveles de adición de C. peruviana (0%, 2.5%, 5% y 7.5%). Se emplearon un total de 180 alevines con longitud y peso inicial de 4,03 ± 0,62cm y 1,94 ± 0,65 gr respectivamente, fueron cultivados en doce acuarios de vidrio de 0.27 m3 de volumen a una capacidad de 15 peces por acuario y alimentados tres veces al día, durante 70 días, a una tasa de alimentación del 15% durante los primeros 50 días y de 3% en los últimos 20 días de estudio. La composición corporal de los peces fue determinado al inicio y al final del estudio. La calidad del agua fue monitoreada diariamente (oxígeno disuelto, temperatura y pH) y quincenalmente (ni...

Objetive: The study has as purpose the evaluation of incidences in mining activity in regional ecology and to propose an enviromental management strategy. Method: We have been visited the Las Bambas mine located in Apurimac as well as the surrouding communities such as Tambopata, Challhuahuacho, Progreso y Chuquibambilla, places that are located in the provinces of Cotabambas and Grau respectively. It has been interviewed the provincial majors of Cotabambas and Grau. Similarily, deeply interviews to the community people have been done . Through the visits it has been made observations related to the reality. Results: In the Apurimac region there are evidences of enviromental contamination and is foreseeable that the mining operations of the project Las Bambas will worsen the problem. As there is not a regional strategy of enviromental management it will cause a great risk to the existing...

Objetive: The study has as purpose the evaluation of incidences in mining activity in regional ecology and to propose an enviromental management strategy. Method: We have been visited the Las Bambas mine located in Apurimac as well as the surrouding communities such as Tambopata, Challhuahuacho, Progreso y Chuquibambilla, places that are located in the provinces of Cotabambas and Grau respectively. It has been interviewed the provincial majors of Cotabambas and Grau. Similarily, deeply interviews to the community people have been done . Through the visits it has been made observations related to the reality. Results: In the Apurimac region there are evidences of enviromental contamination and is foreseeable that the mining operations of the project Las Bambas will worsen the problem. As there is not a regional strategy of enviromental management it will cause a great risk to the existing...