Ciencias Agropecuarias

Permanent URI for this communityhttp://repositorio.uta.edu.ec/handle/123456789/870

Browse

Search Results

Now showing 1 - 2 of 2
  • Item
    Identificación de ectoparásitos en la tilapia roja (Oreochromis mossambicus) y negra (Oreochromis niloticus) en piscifactorías del Cantón Carlos Julio Arosemena Tola
    (2025-02) Herrera Zapata Damary Abigail; Guerrero López Jorge Ricardo
    The present study aimed to investigate the identification of ectoparasites in red tilapia (Oreochromis mossambicus) and black tilapia (Oreochromis niloticus) populations in the canton of Carlos Julio Arosemena Tola in Ecuador. For this purpose, an exhaustive investigation was carried out in 31 fish farms, focusing on 11 farms that reported having health problems. A total of 55 specimens were selected (37 O. niloticus and 18. mossambicus). To carry out the parasitological analysis, microscopic techniques of skin, fins, gills, nares and eyeballs were used in the field study to identify ectoparasites. In addition, factors influencing parasite prevalence were assessed, including fish stocking density and geographical distribution within the canton. Microscopic analysis revealed the presence of Cichlidogyrus sclerosus, a monogenic ectoparasite and mainly located in the first two gill arches in both O. mossambicus and O. niloticus populations. The prevalence of this parasite was higher in O. niloticus (48.64%) compared to O. mossambicus (27.77%). Similarly for the intensity variable, O. niloticus reflected a slightly higher intensity (8.5) than O. mossambicus (7.0). Finally, management strategies for sustainable tilapia farming practices are proposed to mitigate the impact of ectoparasites on fish health and productivity.
  • Item
    Comportamiento productivo en la engorda de tilapia gris alimentadas con dietas a base de Colacasia esculenta en el Puyo Ecuador
    (2016) Guerrero Moya, Grace Gabriela; Barros Rodríguez, Marcos Antonio
    In the province of Pastaza, Puyo, Km 6 Via August 10, 1440 the productive performance of tilapias fed with different proportions of potato leaf China in the growing stage was evaluated. Tilapia were distributed in 2 tanks divided into 24 compartments with 4 treatments and 6 replications, under a completely randomized design (DCA), the treatments were: T1 (commercial feed), T2 (20% HPC), T3 (30% HPC) and T4 (40% HPC). The parameters evaluated were: length and initial and final weight, weight gain / day (g), Daily Growth (mm / day), FCR, Profitability and cost / benefit ratio. The test duration was 60 days. In weight gain no significant differences (P = 0.0950) between treatments maintaining a range between 5.81 to 6.17 g / day gain. The daily growth of tilapia was observed that the greatest growth was in Q4 (0.20 mm / day) being different (P = 0.0084) at T1 (0.10 mm / day). The best feed conversion no significant differences (P = 0.1952) while maintaining a range of 2.41 to 2.54. With respect to profitability and cost / benefit ratio indicated that T4 was higher with 33,40% of profitability and benefit / cost ratio was 1.50. The results suggest that the use of leaf Papa China, which is an important industrial waste could have a potential use in food processing for Tilapia.