Kidney Structure Of Fish. Seawater contains more dissolved salts than the body a fish and freshwater contains less. Due to this concentration gradient water will naturally diffuse into the fish through osmosis causing large amounts of water to build up inside.
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There are great variations in the external structure of the kidney in fishes. Kidneys are important organs that play a role in ion and water regulation in different aquatic environments. Seawater contains more dissolved salts than the body a fish and freshwater contains less.
In fishes some excretion also takes place in the digestive tract skin and especially the gills where ammonia is given off.
The shape varies according to species. Compared with land vertebrates fishes have a special problem in maintaining their internal environment at a constant concentration of water and dissolved. The kidneys occupy dorsal position in the body cavity and is placed just ventral to the vertebral column. Freshwater fish within freshwater fish the kidney is responsible for preventing excess solute loss as they contain more salts within their blood than the water located around thier bodies.
