For humans, the chief solute in urine is urea. For birds, it's uric acid. For fish, it's ammonia (NH3). Since fish live in water, they can afford to excrete such a caustic version of nitrogen. Humans would waste too much water diluting the ammonia to excrete it directly, so we use urea instead.
2007-01-04 08:49:18
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answer #1
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answered by Intrepyd 5
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The kidneys of freshwater fish, produce large amounts of dilute urine, having large numbers of glomeruli, a high GFR, and active reabsorption of ions.
On the other hand, the kidneys of saltwater fishe produce small amounts of concentrated urine, have few or no glomeruli, or active secretion of ions. Marine fish kidneys tend to lack distal tubules. Aglomerular kidneys also lack the glomerulus, neck, and upper proximal tubule.
The kidney collecting ducts lead to ureters, which fuse caudally, sometimes enlarging to form a bladder before leading to the vent. The bladder sometimes has an osmoregulatory function. Most fish, however, have no bladder, and the fused ureters lead directly to the vent. Urea is the main waste product in fish urine.
2007-01-04 20:29:21
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answer #2
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answered by rnrayunretired 3
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Ichthyological Liquid Waste
2007-01-04 15:34:51
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answer #3
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answered by Mickey Mouse Spears 7
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The Ocean.
2007-01-04 15:34:15
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answer #4
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answered by Anonymous
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YCFF* yellow coming from a fish
2007-01-04 16:14:26
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answer #5
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answered by v3k1 1
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Fish Piss
2007-01-04 15:39:45
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answer #6
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answered by J-Far 6
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Fishitahtus Urinattem ... yeah ... that's it!
2007-01-04 15:41:23
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answer #7
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answered by Anonymous
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h20
2007-01-04 15:41:10
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answer #8
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answered by theandy68 2
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