Hi Hacksaw,

You could be right. If there are no animals, there can only be a few reasons for that. The animals that were once there cannot find enough food to survive due to local ecological factors and have moved away or the animals reproductivity has been seriously effected which again would be due to environmental factors because of pollution due to human activity.

Since the water from the reservoir would be under constant testing (it will be used for human consumption) for chemical polution which would effect salinity, nitrate levels and PH levels etc this would be easily detected. I suspect that there would probably be a biological rather than chemical or radiological pollution influence factor. This would be a biological source of pollution that is not being currently tested for in the reservoir waters and one that affects reproduction in higher order mammals or entomological reproduction lower in the food chain that is causing higher order mammals to move away because of starvation.

Are there any pharmaceutical or agrochemical companies nearby who are envolved in dabbling with DNA sequences (genetic engineering)? I suspect there might be.