Good environmental status in relation to the quality descriptor Biodiversity (D1) - groups of species of birds, reptiles, mammals, fish and cephalopods is achieved when: (1) the mortality rate for an individual species due to accidental by-catches is below endangering that their long-term viability is guaranteed, (2) anthropogenic pressures do not adversely affect the abundance of fish species populations, so that their long-term viability is guaranteed, (3) the demographic characteristics of commercial fish and cephalopod populations are typical for a healthy population, (4) the range of the species is in accordance with the prevailing physiographic, geographical and climatic conditions, (5) the habitat of the species has the necessary range and conditions to support the different stages of the life cycle of the species.