Hi Mark,

I think it is Sturisomatichthys sp. "Columbia" or "Kolumbien" as Hans and Ingo called them. I received 7 specimens more than ten years ago (1994?) when I moved to Berlin and I am currently breeding them in the 3rd generation. The colour patterns from the first offspring turned out to be ...

Hi Amanda,

Neutral: Neither acid nor base. Having a pH of 7.0.

I agree but to make it more precise: neutral means that the amount of hydrogen ions H^+ and OH^- are equal. A pH of 7.0 is not necessarily neutral. It depends on temperature and concentration of other substances like salts and ions ...

Hi Folks,

what about the following definition of "buffer"?

Buffer: A organic or inorganic substance dissolved in water that can bind or release hydrogen ions in order to avoid huge pH changes when adding acidic or alkaline substances.

any suggestions?

cheers

Stefan

Hi Amanda,

Stefan, I'll enter the corrected Swim Bladder today. I deleted it yesterday to avoid any confusion.

thank you. I fully agree with your definition.

cheers

Stefan

Hi Jools,

Berlin, Germany. Do you remember? I met you at the catfish meeting in February. Finally found my way into this forum.

cheers

Stefan

Hi Mats,

So, to clarify: A creature that isn't evolved to live in such condtions would suffer from hypoxia in an anoxic environment...

I would also see it vice versa: If a fish can not adapt his respiration to hypoxic conditions (severe hypoxia rather than moderate hypoxia), he would suffer from ...

Hi Folks:

a short note on the definition of swim-bladder:

"A sac or container for air and gasses. The fish can compress and enlarge the Swim Bladder
through muscular activity to control buoyancy."

To my knowledge, the swim-bladder is filled through diffusion of gases (usually mostly oxygen, but ...

Hi,

my first entry.

Hypoxia: The actual oxygen concentration is lower than the oxygen concentration of water fully equilibrated with air.

Hyperoxia: The actual oxygen concentration is higher than the oxygen concentration of water fully equilibrated with air.

cheers

Stefan