Crecimiento de dos variedades de mojarra tilapia en jaulas flotantes, bajo tres densidades de población

Se estudió el efecto de diferentes densidades de población sobre el crecimiento de dos variedades de mojarra tilapia, Oreochromis niloticus (variedad Stirling) y Oreochromis ssp (pargo UNAM). El trabajo se realizó bajo el sistema de jaulas flotantes con capacidad de 1m3 (3x1x1), bajo tres densidades experimentales: 100, 200 y 300 peces/m3 /Jaula. El experimento se evaluó durante tres meses (marzo, abril y mayo), los peces se alimentaron a libre acceso tomando en cuenta su biomasa corporal, duplicando la alimentación para la densidad de 200 y triplicándola para la densidad de 300. El crecimiento se evaluó con base en talla y peso, con diseño factorial completamente al azar y diez repeticiones por cada tratamiento, utilizando un ANOVA para el análisis de los datos. Los resultados del experimento nos indican que estadísticamente hay diferencia significativa para ambas variedades. La variedad Stirling tiene un crecimiento significativo y mejor adaptación a las diferentes densidades a la que fue sometida, Pargo-UNAM sólo se adapta y tiene mejor crecimiento con densidad de 100 peces/m3. Los resultados obtenidos indican que para tener resultados satisfactorios en la producción de tilapia en jaulas flotantes, se deben tomar en cuenta las densidades poblacionales, que son parte funcional de un sistema de producción

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries