Salmon eggs hatch in fresh water. The fish then migrate to the ocean (a hyperton

Question

Salmon eggs hatch in fresh water. The fish then migrate to the ocean (a hypertonic solution) and, after several years of feeding and growing, return to fresh water to breed. How can these organisms make the transition from fresh water to ocean water and back to fresh water?

Salmon in fresh water excrete concentrated urine, and salmon in salt water secrete dilute urine.

The rectal gland functions in the ocean water, and chloride cells function in fresh water.

The salt transport mechanisms of the gill epithelia change during migration.

Their metabolism changes in salt water to degrade electrolytes.

Salmon in fresh water excrete concentrated urine, and salmon in salt water secrete dilute urine.

The rectal gland functions in the ocean water, and chloride cells function in fresh water.

The salt transport mechanisms of the gill epithelia change during migration.

Their metabolism changes in salt water to degrade electrolytes.

Explanation / Answer

answer- The salt transport mechanisms of the gill epithelia change during migration.

cells of the gills have molecular pumps, which shifts into reverse by pumping sodiums ions out instead of in.

gills have pumping cells which are called as chloride cells. these cells have Na+K+ ATPase present on the membrane . this pump regulate the amount of sodium and potassium inside the membrane. as we know fresh water contains low sodium , gills cells of salmon pump sodium in as salmon swim downstream.

when it enters into ocean , there is abundance of sodium , samon needs gill cells to pump sodium out.

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