Graphical AbstractAbstract.The research was carried outs in the province of Pastaza in the Ecuadorian Amazon with the objective of determining external and internal quality at different days of storage in Creole eggs sent to local markets. 840 Creole eggs were evaluated, which were measured depending on the days of storage, and 120 eggs were sampled MOL2NET, 2019, 5, doi:10.3390/mol2net-05-xxxx 2 for each day of storage. The treatments to be applied were seven storage times 0, 5, 10, 15, 20, 25 and 30 days. The variables that were measured for external quality were egg weight, shape index and shell index. For internal quality was evaluated: yolk index and haugh Units. A Fully Randomized Design (DCA) was used. The external quality of the egg is affected only by the weight, which decreases after 10 days of storage in local markets, while the shape index and the shell index did not show any alteration. Regarding internal quality, the indicators of the yolk index and Haugh Units began to decrease their quality as the days of storage increased, affecting the commercialization process. It is considered that for the commercialization and packaging the Creole egg can be used until day 5 taking into account the yolk index, whereas with respect to Haugh Units until day 25 of storage in local markets for the conditions of the Ecuadorian AmazonInsert abstract text here

Graphical AbstractTropical fish hatching coupling (TFHC) Abstract.This research has focused on the generation of an economic, efficient and safe technology that allows adequate control of water consumption and uses recirculation to control factors associated with water quality. Aquaculture companies interested in providing a recirculating aquaculture system (RAS) for tropical fish farming can replicate this prototype to be successful in all areas of production. The design was based on the use of locally available components, equipment and recycled containers for mechanical and biological filters. Two recirculation systems were implemented: i) maintenance of aquatic organisms (MAO); ii) tropical fish hatching coupling (TFHC). In both cases, operating tests were performed with electric and solar heaters. The requirements for oxygenation, evacuation, separation of biosolids, biofiltration, CO2 degassing, fish metabolites, pathogens control, temperature maintenance and variables measurement were all adapted and solved. Results show that the RAS provides controlled conditions for temperature, dissolved oxygen and pH stability. Nitrogen was safely removed in quantities acceptable to tolerant levels. Environmental adaptation for artificial hormonal induction treatments create a significant temperature increase. Solar heating adaptations stabilized this process; oxygen remained saturated and at respectable levels. The biofilter systems kept all important water quality parameters in balance. The recirculation systems removed NO2 and NO3 organic load. The recirculation flow rate was regulated in the MAO at approximately 10 l/min, a replacement rate of 120% per hour; while in the TFHC a flow rate of 7 l/min per incubator was used, i.e. 14 L/min in the system, which implies a replacement of 280% in the incubators and 170% in the maintenance tanks.