Scotland's salmon farming sector saw an average monthly survival rate of 98.6% for 2019, according to figures published by the Scottish Salmon Producers Organisation (SSPO).   The average was down slightly on the 2018 figure of 98.83%, "owing to environmental challenges experienced by a number of farms in the third and fourth quarters of the year".   Salmon farmers worked hard to overcome environmental challenges from August onwards, including planktonic blooms and increased water temperatures, said SSPO [...]