I'm working on a conservation project that will soon release ~10 endangered fish that were bred in captivity into a pond. We're hoping this pond serves as a temporal home for a few years, while their natural, polluted habitat is restored. A previous observational study suggests that their spatial distribution within their habitat is aggregated; they stay together in groups of two. This result could impact future relocation programs. But how can I statistically confirm this?
I've found studies that plot the trajectories of individual animals to show how they overlap. Others suggest saying animals were within 1 meter distance from each other in 20 out of 23 readings (made up example). But I'd like a statistic to complement this, I'd appreciate all suggestions.
We will use manual radio telemetry to track individuals and will have a diurnal and nocturnal spatial location (latitude and longitude) for each individual animal on a daily basis during six weeks. We will also analyze how environmental variables affect their distribution, but for this question I'm interested in the social component. Thank you.