To know the abundance of fishes and their size distribution in semi-intensive rearing systems traditional ponds is an aspect key to plan manage efficiently sales lots. Usually this information obtained by means sampling which mandatory supposes a direct catch stressful time consuming management fishes. Therefore, work we propose use non-invasive procedures based on multibeam sonars or imaging c...

plant biomass is an important factor for determining arid and semi-aridrangelands capacity. due to the lack of proper and annual sampling of rangelands, there areno suitable data to determine biomass, range condition and proper range managementoperations. plant biomass is one of the measurable attributes that can be assessed inrangeland studies. since the clip and weight method is destructive a...