Biology ⁽¹⁾

(This post described my freshwater fish setups in 2016-2018.) "Old Grandpa" was the oldest male of my family of Characodon Lateralis "Los Berros" (aquarium strain) in Denver, CO, USA. Their numbers and habitats are declining rapidly in the wild. In the 1950s, they could be found in approximately fifty different locations in western Mexico, and today they can be found in nine. While not widely available, they are hearty, beautiful, and full of personality. Raising these fish in a home aquarium or pond is…