- Amoniotelia o excreción amoniacal, que se pierde por difusión en el agua.

- Ureotelia o excreción de urea, que se elimina disuelta en agua formando orina.

http://galeon.hispavista.com/vantxu/dos.htm
http://www.google.com.ar/url?sa=U&start=1&q=http://www.uniov...
http://www.google.com.ar/url?sa=U&start=3&q=http://www.uvigo...


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Note added at 1 día15 horas (2006-07-20 18:22:23 GMT)
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FE DE ERRATA:

Dice: ureotelia
Debe decir: uricotelia

La traducción para amoniotélico al inglés es ammoniotelic y la de uricotélico es uricotelic:
http://www.google.com.ar/url?sa=U&start=1&q=http://wps.aw.co...

1) Ammoniotelic – protein digestion results in ammonia
a) Ammonia is toxic but easy to produce
b) Not a problem when rapidly excreting into the water through gills
c) NH4+ is exchanged for Na+ at gills for maintenance of ion balance
2) Ureotelic – urea is the primary nitrogenous end product
a) Elasmobranchs and coelacanths
b) Needed to maintain isosomotic balance with environment
c) Requires energy to make
3) Some fish can be either ammoniotelic or ureotelic
a) African lungfish need to produce urea while estivating
b) Toadfish – produce urea while confined to a small volume of water
c) Magadi tilapia – produce urea in extremely alkaline lakes
http://www.k-state.edu/fishecology/Ichthyology/feeding.htm

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&d...

A5) (5 points) Would you expect an aestivating (over-summering) lungfish to be ammoniotelic of ureotelic? Explain your answer.

Urea is less toxic than ammonia and hence requires less water for its excretion. Urea is a common nitrogenous waste product in xeric (limited water) situations. Aestivating lungfishes bury themselves in the substratum sometimes in a mucus sheath, to survive summer conditions of high temperature and limited water. Therefore, aestivating lungfishes are in a xeric situation and are more likely to be ureotelic than ammoniotelic.
http://www-personal.umich.edu/~pwebb/NRE422-BIO440/lec14.htm...

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?tool=QuerySugg...


living as no hace mención a organismo en inglés porque no lo necesita, su traducción al español igualmente no la necesita porque se dirá simplemente: "vive como una amoniotelia cuando está en el agua y como una uricotelia cuando está en la tierra."


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Note added at 1 día15 horas (2006-07-20 18:33:26 GMT)
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En resumen:
ammoniotelic = amoniotélico
uricotelic = uricotélico
ammoniotele = amoniotelia
uricotele = uricotelia