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Browsing Capítulos de libros by Author "Castañeda Álvarez, Germán David"
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Item Efecto de la densidad de siembra sobre la larvicultura de guabina (rhamdia sebae c.f.) en sistema de recirculación.(Corporación Universitaria Lasallista, 2011-06-01) David Ruales, Carlos Arturo; Castañeda Álvarez, Germán David; Cruz Segura, Claudia Isabel; Lenis Sucerquia, Gustavo Adolfo; Castro Rojas, Juan David; Álvarez Vanegas, Miguel Augusto; Lidueña Arrieta, Neithan; Martínez Morales, Ever SegundoAbstract: Introduction. Larviculture phase is the most important stage in a fry production system. Most of native fish species have altricial larvae, which are known for their low development, and which require optimal conditions. Recirculation systems are a technological tool that is environmentally friendly and allows productivity and profitability increases in larviculture. Objective. To evaluate three containment densities and their effects on Rhamdia sebae larvae´s growth and survival in a re- circulation system. Materials and methods. “Guabina” (Rhamdia sebae) larvae with a posthatching period of 36 hours were used. They were seeded in three densities, 25, 50 and 75 larvae L-1 (T1, T2 y T3 respectively) in triplicate, in 80 litters containers, in a recirculation system. In the different treatments, the animals were fed for the first time and during a 17 days period with Artemia salina nauplii and concentrated food with a 35 % of brute protein. Results. At the end of the experiment, the results indicated significant differences (p<0.05) between the treatments concerning the weight gain and the survival. The best performance was that of T1 (21.72 ± 5.57 mg and 73.08 ± 14.51%, respectively), also including, for this treatment, the best specific growth rate (6,32%), followed by T2 (13 ± 5,14 mg and 44.33 ± 12.04%) and T3 (8.12 ± 3.38 mg and 38.92 ± 11.84%). Conclusion. The best seeding density in this kind of system was 25 L-1 larvae.Item Larvicultura de peces comerciales en sistemas de recirculación(Corporación Universitaria Lasallista, 2011-06-03) David Ruales, Carlos Arturo; Castañeda Álvarez, Germán DavidAbstract: Success in fish farming, and in general for aquaculture production, depends essentially on the farmer’s comprehension of the production systems used and the development stages of each species. It can be said that the larviculture stage is the most important one in a fry production system and, evidently, every advance that can be made in order to understand it is developed simultaneously with technologies that become more and more sophisticated, and must be well understood before starting the farming activities. The evolutionof productive systems in aquaculture tends to make production more intensive and be, at the same time, environmentally friendly. Recirculation systems in aquaculture provide a constant culture medium that can be monitored, with few variations. The systems are established to control the different parameters of water quality, such as temperature, oxygen, nitrogen and pathogens. They contribute to a more intensive, reliable, clean and more profitable production. This revision aims to look at the most important characteristics that affect larviculture in fish and to see how recirculation systems offer an excellent alternative in fry production.