Question 7: Choose the correct answer for blank (2).

Fill in the blanks with correct expressions of numbers/values/quantity.
Mortality is a crude, but (1) ___________, indicator of fish health and fish welfare. 60.3 (2) ______________ Norwegian farmed salmon were lost from production between sea-transfer and harvest, of which 52.1 million were categorised as mortality-related, not far short of the record number registered in 2019 (53.2 million). The (3) _________ figure in 2019 could be partly explained by losses associated with algal blooms in Nordland and Troms, which alone killed (4) ____________ 8 million fish. We have not identified any particular event which could be linked to the high mortality registered in 2020. We see that the increase in mechanical delousing continued again between 2019 and 2020. There are no indications of decreasing prevalence of infectious diseases. On the contrary, (5) ____________ is indicated where comparable statistics are available.
Based on the above data, answer the given subquestions.

Choose the correct answer for blank (2).