Migration Ways of Fish Changed
20.04.2010 Cumhuriyet
] [Global climate change also spoiled the migration models of fish in Turkey.
[[T]]In the report prepared by the European Environmental Agency (EA), the water temperature in the seas and the directional changes in seasonal winds were indicated that fish change the migration paths. [ [In the report indicated that changes in the road affect the fish stocks, the high economic value of palamut, lufer and mackerru are explained changes in the migration roads of species.
This kind of fish is corrected to the Mediterranean in the fall, in the spring, it was highlighted that they migrated to the Black Sea at the specified report, each last year over the less number of fish over the throats.
Described that changes in the road are caused by changes in the maximum water temperature and seasonal winds, the following was recorded:
'These types require the requirements such as correct water temperature, feed quantity and enough feeding time. Twenty years ago they migrated to the south in September. With the warming of water temperature in the Black Sea, fish no longer need to migrate to the middle of October or south until November. This is due to the fact that fish stay shorter in the Mediterranean and return to the north, they are smaller as count and volume. '
The report that hot waters pose a threat to fish was found in the following detections: "When these fish are adapting, their metabolism is accelerated. They grow faster and often up to smaller adult size and need more eating and more oxygen to support high metabolisms. At the same time, as the water temperature rises, the amount of oxygen in the water content is reduced. Many fish face the danger called oxygen jamming. When increasing the needs, resources are reduced.
The change also changes the salt rate of seawater, acidity and layer forming shapes. The effects of these changes can be quite devastating. The destruction of coral rocks, the spread of fox species and diseases, the absence of species at the top of the pyramid, and finally the change of the entire structure of the marine food chain is some of these serious effects.
The raw stocks in the Black Sea
] [Raporda also stated that the number of raw materials in the Black Sea began to decrease in various reasons from 1980.
In this case, excessive hunting, increased water temperatures, a new type of dredging sea from the north western Atlantic, reported that it causes the region to invade, "This type of jellyfish is feeding from the ballast waters, fish larvae and organisms discharged from cargo vessels from the Black Sea. Thus, it was called 'not being the necessary nutrients for its raw flocks.
Raporda recorded some improvement studies in the ecosystem in the Black Sea in the last period against these developments.
Source: News