Karl the Fish Guy

12/10/2026

Interesting!

Nitrate reduction with organic carbon dosing - By Tony Griffitts

11/10/2026

Costa Rican scientists and marine conservation specialists are working to revive an important field of research that could help protect fish populations

09/10/2026

My first spawning of Mikrogeophagus altispinosa a.k.a Clown Ruby Cichlid, or Bolivian Ramirezi! Here the female is seen hovering over her clutch of recently laid eggs, that have been attached to a Catappa leaf. https://linktr.ee/karlthefishguy

01/10/2026

How are species boundaries maintained in the face of environmental disturbance? This is not only a fundamental question in evolutionary biology but also an increasingly important one as human activities and climate change alter habitats and bring previously separated species into contact.

23/09/2026

If they could come and fetch me from the bed, they would
https://linktr.ee/karlthefishguy

20/09/2026

I do love a good Shiro Utsuri koi
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04/09/2026

We're hard at work sourcing the best fish for this season!

stay tuned for updates, dates and more!

See you soon!

23/08/2026

Biologists are searching reservoirs between Columbia River dams for a dangerous predator they hope never to find, testing the water for northern pike DNA.

23/08/2026

A total of 12 juvenile giant shovelnose rays (or giant guitarfish), a critically endangered species worldwide, have recently been successfully bred under artificial care in Sanya, South China's Hainan Province, marking a significant achievement in marine species conservation, according to a report b...

08/08/2026

In the deep, dim ocean, a world of eat-or-be-eaten, lighting up may seem like a counterintuitive survival strategy.