Why is the production of mackerel not high this year?

Why is the production of mackerel not high this year?

Scientists reveal the comprehensive influence of environmental factors on the early growth of chub mackerel. Mackerel is a migratory fish. Every year, they spawn in the southern waters of Japan in spring and summer, then enter the vast Pacific Ocean along the Kuroshio, gradually migrate north to chase rich food, and then migrate south again and again in the cold season.

However, in the complex marine environment, most newborn fish will not grow smoothly and survive to adulthood due to various factors such as unsuitable water temperature, lack of bait, competition among the same species, etc. Mackerel spawns tens of billions of eggs every year, and the ultimate survival rate is less than 1/10000. This near catastrophic survival rate is called "initial consumption reduction", which will directly affect the harvest of mackerel fishery in that year.