Russia: Japanese scientists warn that fish have begun to lose weight due to a global problem

Despite the growth in the population of Japanese sardines and chub, the fish themselves have become smaller over 14 years of observation. The weight of the catch decreases in waves. The previous wave occurred in the 80s. Then the phenomenon was explained by the fact that, along with the population of the species, competition for food also increased. In addition, rising ocean temperatures are affecting the diet of sardines. Due to the climate problem, large plankton become smaller or are replaced by less nutritious jellyfish. It is necessary, first of all, for the authorities and representatives of the fishing industry to take these changes into account, experts emphasize. Previously, it was proposed to limit the catch of roach in Astrakhan rivers. According to the project developed by the Ministry of Agriculture, in 2024 it will be possible to fish only at the ...