Oh, yes. In pretty much the normal fashion. A little string comes out of the back of the fish. Almost all animals excrete wastes. fishes excrete ammonia as a waste product
http://wiki.answers.com/Q/Do_fish_excrete_waste
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[First Fish and Aquariums page] ... Betta fish are naturally carnivores. They don't eat plants in the wild (this is why bettas in jars are so bad). If it will eat... ... Smaller tropical fish such as a beta, smaller tetras, danios, or a few mollies or platies. Rosy and cloud minnows can be kept in...
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wiki.answers.com/Q/FAQ/2101-7
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Not all animals use the same routes or excrete their wastes the same way humans do. applies to metabolic waste products that cross a plasma membrane. Elimination is the removal of ... Freshwater fish must prevent water gain and salt loss. They do not drink water, and have their skin covered by a thin mucus.
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www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookEXCRE...
www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookEXCRET.html
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Commercial fish food contains protein, carbohydrates, fats, vitamins and minerals. The organic compounds in the food contain carbon (C), hydrogen (H), oxygen (O), nitrogen (N) and a number of minor elements. Fish excrete some wastes in liquid form and some in solid form.
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ag.arizona.edu/azaqua/bmps.html
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Plants may secrete wastes into the environment but usually the wastes are stored in the tonoplast. Toxic materials are also stored here. Both the toxic materials and metabolic wastes may contribute to the taste of a plant, ... Fish, some birds and some reptiles use accessory organs. Do you know what they are?
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www.bioinquiry.vt.edu/bioinquiry/water/waterpaid/waterh...
www.bioinquiry.vt.edu/bioinquiry/water/waterpaid/waterhtmls/excrete.html
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Fish excrete waste as ammonia and urea into the water. Fish waste contains about 70 percent of the nitrogen load of the system. Un-ionized ammonia or NH3 is extremely toxic. Ionized ammonia or NH4+ is non-toxic. With a high density of fishes, un-ionized ammonia levels rise as temperature and pH increase.
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www2.hawaii.edu/~oran/ecosystem.htm
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Because fish excrete their wastes into the water, these wastes need to be removed regularly. Siphon the gravel in your betta's tank once a week, and remove about 25 to 50 percent of the water from the tank.
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www.helium.com/items/1370790-keeping-a-betta-healthy
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The nitrogen cycle is a process which allows "good" bacteria to establish and multiple in the tank, thus breaking down the fish wastes. Fish excrete ammonia as a waste product. Ammonia is highly toxic to fish and even small quantities in the water can kill your fish.
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www.aquaria.info/print.php?sid=376
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Animals excrete wastes. Fish dump excess nitrogen (urea, nitrite, ammonia) and other wastes into water. Crowding fish together in a closed container, and feeding them high protein diet to force rapid growth, generates a lot of wastes.
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rainbowfish.se/mailgroup/f500.htm
rainbowfish.se/mailgroup/f500.htm
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