Ocean ecosystem is very sensible on changing sea temperature. Today, as sea temperature continuously rising, the balance of ecosystem is broken.

 

  Other organisms affected by temperature change include krill, an extremely important link at the base of the food chain. Research has shown that krill reproduce in significantly smaller numbers when ocean temperatures rise. This can have a cascading effect by disrupting the life cycle of krill eaters, such as penguins and seals—which in turn causes food shortages for higher predators.

 

 

Effect of rising sea temperature about ocean currents

 

  Many currents flow in the Northwest of Pacific such as the Lehman • the Kuroshio • the Kuril Current and the Daehan • the Daema turbulent. Long-term change is not likely about increasing or decreasing the flow of the Kuroshio Current. 100 years later, however, the limit position of the north side of the Kuroshio Current is not changed, but velocity of flow will be faster about 30%.

 

  The Kuroshio Current carries with many things, such as algae spores floating in the south sea, spawn, larvae, juvenile. When the Kuroshio Current is faster, southern fish, shellfish, algae are carried far more than ever and there are many opportunities they may survive around the Korea and Japan.

 

 

Impact on fish survival rate

 

  A fish took the eggs to breed. If the sea temperature is too low or too high, do not hatching success. Thus, the success rate of hatching is depending on temperature. Further, after incubation, the growth is highly dependent on temperature, but growing faster will be the key to survive as little fish is ate easy by predators. Thus, the growth of young fish by the water temperature changes, it is also expected to change survival rate.

 

  If fish has swimming force, it has the ability to escape and eaten effect is decreased even if it attacked from the outward. At this point, what sea temperature affects is the ability of swimming and the respiratory metabolism. The higher the temperature is, the higher swimming ability is. It is expected to be promoted higher growth and to be higher the ability of preying on something. Conversely, however, if the sea temperature rises, such as the action of the enzyme in the body is active. So energy can be lost by respiration metabolism. Because of this, there is a possibility that it will be slow growth.

 

 

Impact on optimum temperature and migration path

 

  The fish is also living organisms, so the fish is a suitable temperature (optimum temperature) like humans. The result of a long history, of large current temperate to placate the opponents have been able to take advantage of you can think of. Thus, if the sea temperature is rising due to global warming, the current migration path (route) is far away from the optimum temperature.  It is expected to occur to change migration path or the movement of spawning grounds.

 

 

Increasing that the marine life goes to the polar regions due to rising the sea temperature

 

  Depending on the sea temperature is rising every year, marine life has moved toward the polar regions about 7km. The land organisms also have moved, but the speed is about 1km per year.

The temperature of the continent rises more rapidly than ocean temperature, but in the oceans, obstacles such as the hills and valleys don’t exist, moving marine life is estimated to be faster.

Species that live in attached rock on the beach, such as barnacles and shellfish, most likely to become extinct because they don’t move fast even if the sea temperature rises.

  On the other hand, marine life moves toward the polar regions to find optimum temperature, as well as they change their breeding, feeding, migration patterns and adapt to increased sea temperature. Organisms such as plankton go down to bottom cold water of deep sea to reduce their body temperature if the sea temperature rises in the summer. ‘Bottom cold water’ is gradually moving toward deep sea due to the impact of global warming.

  Fish that have habit of moving along feed go chase the plankton, do not come back again. 'Bottom cold water’ becomes new settlements of fish. When this occurs, the amount of fish in the sea surface is reduced and catches may be reduced.