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Old 04-08-2009
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http://www.geo.arizona.edu/nyanza/pdf/Hintz.pdf

Above is a link to an article about nutrient recycling. "Relatively" simple read.

Most interesting statement:

"Nutrient recycling occurs when nutrients are released into the environment by animals or microbial consumers. Fish-mediated nutrient recycling is an important source of nutrients for primary producers in many aquatic ecosystems, sometimes even exceeding external loading rates (Attayde and Hansson 2001). Consumers release non-assimilated nutrients as liquid waste that is available to primary producers or as feces that is available after further degradation."

In other words, tropheus eat poo from other fishes.

general comments: I don't really think this is a great article compared to some others. Tana Hintz just took 8 fishes and tested what they excreted in a bag. Tested the water and came up with her conclusion.

There are two problems I see with this:

1) Sample of 8 fishes don't mean much.
2) even as normal fish keepers we know that tropheus will not have a constant excretion rate. I see my fishes excreting their food at different times during the day.

However, to her credit she did say more research needs to be done.

Hope you guys enjoy the read.
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Old 04-08-2009
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This study isn't about our Trophs sampling each others waste. Its about a hypothesized variable rate of excretion dependent upon individual productivity/needs and available nutrients. I have to agree that it doesn't provide much in the form of proof and the lack of algal testing is also disappointing.

Do your fish actually eat each other's poo or just sample it?
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Old 04-08-2009
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<div class='quotetop'>QUOTE(salaCzar @ Apr 8 2009, 10:37 AM) <{POST_SNAPBACK}></div>
Quote:
This study isn't about our Trophs sampling each others waste. Its about a hypothesized variable rate of excretion dependent upon individual productivity/needs and available nutrients.

Totally agree. I was haste in making my remarks.

Do your fish actually eat each other's poo or just sample it?

I have no idea if they are just sampling it or eating it or sampling it and eating it. I do know they eat sand. I have seen sand being excreted a long with other waste products.

Interesting, I never saw this with my ulwiles colony but I have noticed it a lot with my ilangi colony.
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