Campoverde Tandazo, Bryan Alexander; Añazco Bravo, Bryan Steeven(Machala : Universidad Técnica de Machala, 2025)
This study evaluated the effect of hydrogen peroxide (H₂O₂) and sodium percarbonate (SPC) as amendments to mitigate dissolved oxygen depletion in white shrimp (Litopenaeus vannamei) farming, determining their effectiveness ...
Elizalde Elizalde, Carlos Daniel; Jaramillo Rios, Jostyn Jahir(Machala : Universidad Técnica de Machala, 2025)
This study evaluated the effect of Bacillus spp., Lemna minor, and Pistia stratiotes on the reduction of nitrogen (ammonium, nitrite, nitrate) and phosphorus (phosphate) compounds in aquaculture effluents. The study was ...
Mosquera Diaz, Ariana Milena(Machala : Universidad Técnica de Machala, 2025)
The present study evaluated the efficacy of a commercial bacteriophage in reducing the bacterial load of Vibrio spp. in white shrimp (Litopenaeus vannamei) postlarvae cultured under two salinity conditions: 20 and 30 ups. ...
Machuca Quezada, Karelys Paola; Diaz Jimbo, Oscar Alexander(Machala : Universidad Técnica de Machala, 2025)
This study aimed to evaluate the effect of humic acids (HA) and fulvic acids (FA) applied to the culture water on the pigmentation of white shrimp (Litopenaeus vannamei), a key trait for its commercial value. The experiment ...
Molina Bravo, Jandry Joseph; Rambay Peña, Paul Alejandro(Machala : Universidad Técnica de Machala, 2025)
This study evaluated the effect of partial inclusion of Tenebrio molitor meal in isoproteic diets on the growth performance and feed conversion efficiency of Oreochromis mossambicus over a seven-week experimental period. ...
Montesdeoca Aguilar, Peter Alexander(Machala : Universidad Técnica de Machala, 2025)
This study aimed to evaluate the attractability of three commercial shrimp feeds (labeled A, B, and C) available in southern Ecuador, specifically formulated for Litopenaeus vannamei, under controlled laboratory conditions. ...
Elizalde Guerrero, Darling Ibeth; Sanchez Barrera, Jennifer Nicole(Machala : Universidad Técnica de Machala, 2025)
This study evaluated the effect of the fruit fly (Drosophila melanogaster) on the growth and survival of Nile tilapia (Oreochromis niloticus) fry, compared to a commercial balanced feed and a mixed diet. The research was ...
Tenorio Mera, Carolina Isabel; Sanmartin Armijos, Roberto Carlos(Machala : Universidad Técnica de Machala, 2025)
This study evaluated the effect of partial solar blanket (SB) coverage on water temperature in aquaculture ponds, as well as its influence on key water quality parameters such as dissolved oxygen (DO), pH, and primary ...
Zambrano Leon, Nelson Javier; Gallo Mendieta, Geovanny Steeven(Machala : Universidad Técnica de Machala, 2025)
This study aimed to evaluate the effect of including domestic cricket meal (Acheta domesticus) as a partial replacement for fishmeal in the diet of Pacific white shrimp (Litopenaeus vannamei), focusing specifically on its ...
Aponte Socola, Edwin Fernando(Machala : Universidad Técnica de Machala, 2025)
In fish farming, normal growth behavior depends on factors such as pH and dissolved oxygen in the water, however the homogenization of fish size and the correct dosage of exogenous feed is a critical factor for an efficient ...
Castro Zerda, Jhans Willan; Chamba Cumbicos, Kelvin Emmanuel(Machala : Universidad Técnica de Machala, 2024)
The accumulation of organic matter in shrimp farm sediments can negatively impact water quality and Litopenaeus vannamei production. This study evaluated the ability of Saccharomyces boulardii and Bacillus spp. to degrade ...
Matamoros Romero, Geraldine Gissele; Romero Maldonado, Ana Belen(Machala : Universidad Técnica de Machala, 2024)
The main objective of this research paper is to evaluate the effectiveness of seven Bacillus spp. strains in the ammonia (NH₃) levels reduction in shrimp pool water and its impact on water quality. It focuses on analyzing ...
Calozuma Vicente, Byron Andres; Garcia Castillo, Hans Luis(Machala : Universidad Técnica de Machala, 2024)
The research analyzed the incidence of initial weight and seeding density on the growth and survival of Litopenaeus vannamei, with the objective of optimizing production in aquaculture systems. It was carried out in the ...
Tello Espinoza, Darwin Alexander(Machala : Universidad Técnica de Machala, 2024)
Aquaculture, especially the production of Pacific white shrimp (Litopenaeus vannamei) in Ecuador, is of great economic and social importance. In shrimp farming systems, ponds are essential for the growth and development ...
Romero Requelme, Ariana Jareth; Gualan Salinas, Johanna Margarita(Machala : Universidad Técnica de Machala, 2024)
The intensification of aquaculture production generates sediments accumulation, that represent a serious problem for this sector. For this reason, the objective of this experimental work was to evaluate the effect of a ...
Noblecilla Coello, Eduardo David; Portilla Leiva, Maria Paula(Machala : Universidad Técnica de Machala, 2024)
The production of Litopenaeus vannamei continues to be problematic in its feeding phase, with its high input costs, mainly due to the dependence on fishmeal in traditional diets. The current proposal to address this problem ...
Encalada Montalvan, Evelyn Stefany; Silva Ramon, Bryan Joel(Machala : Universidad Técnica de Machala, 2024)
The use of nutritional additives in the culture of aquatic organisms is essential to help in the growth and health of the animals. The objective of the present study was to evaluate a balanced diet with the addition of ...
Cueva Chalan, Angie Yulieth; Ibañez Moreno, Kleimer Steeven(Machala : Universidad Técnica de Machala, 2024)
The objective of this research is to determine the effect of bacteriophages on the bacterial loads of Vibrios spp. in white shrimp through their application in the balanced feed. Different treatments were established with ...
Roman Mora, Roberto Eduardo; Jaramillo Herrera, Brython Josue(Machala : Universidad Técnica de Machala, 2024)
This study evaluated the genotoxicity of contaminated water from the Siete River using the micronucleus test in juvenile Oreochromis niloticus. The effects of different dilutions of contaminated water (0%, 10%, 25%, 50%, ...