The podcast that I listen to both regularly and inexplicably is the US Fish and Wildlife Service’s ‘Fish of the Week.’ If you would also like some random piscine goodness in your life, the episode on the Mexican tetra (‘the most phenotypically dichotomous fish’) is especially great, and not just because the host describes what Odysseus did to Astyanax as ‘yeeting’:

https://www.fws.gov/fish-of-the-week-podcast