Karl the Fish Guy

Karl the Fish Guy Fishkeeper and aquarist for over 30 years. "Water too pure, breeds no fish"
- Hong Zicheng 菜根譚 c.1596 Will you join me?

Lifelong fishkeeper and aquarist, returning from a multi-year break from the fish hobby and pet trade. I now write about my fishkeeping experiences, while rekindling my love for the hobby/trade that I have spent the majority of my adult life doing. To sum it up, welcome to the chronicle of my fishkeeping adventures, past and present.

15/12/2025

A new fish species has been discovered in Zayul County, southwest China's Xizang Autonomous Region, providing insights for studies of fish diversity and biological evolution in the Himalayan area, said the Institute of Plateau Biology of the Xizang Autonomous Region on Saturday.

13/12/2025
Fish noise, for Science!
10/12/2025

Fish noise, for Science!

Fish were discovered to make sounds more than 2,000 years ago, but they have gone largely unheard by humans. While a typical, bustling coral reef may be home to dozens of fish species, until recently, identifying specific species’ sounds was practically impossible. Previous methods of studying fis...

Check that you still have water before doing any water changes this weekend
09/12/2025

Check that you still have water before doing any water changes this weekend

According to Joburg Water, the work is necessary to ensure the long-term reliability of the city's water network.

09/12/2025

Scientists reveal Priocharax rex, a tiny Amazonian fish with a strange skin “wing” that redefines evolution in miniature.

30/11/2025

Scientists just discovered a new fish and gave it one of the coolest names ever: Vanderhorstia Supersaiyan. Yep… they named it after Goku’s iconic Super Saiyan transformation from Dragon Ball Z.

Found off the coast of Okinawa, the tiny goby has bright yellow fin stripes that instantly reminded researchers of Goku powering up. The pattern is so unique that no other species in its family looks like it.

Anime fans are loving it, and honestly, same. Nature going full Dragon Ball wasn’t on my 2025 bingo card. 🐟⚡💛

30/11/2025
26/11/2025
26/11/2025

Cuban scientists race against time to save fish as old as the dinosaurs

Click the link in the comments below.

26/11/2025
18/11/2025

The Endler Guppies seem quite happy - these fry were nowhere to be seen yesterday!

31/08/2025

David Lister said Aberhafesp Brook was "bone dry" leaving the fish stranded in small puddles of water.

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