Fish farming has bassically the same problems than traditional farming (problems that must be solved), but wins clearly in some aspects.
First of all is more efficient. We produce human food via cold blooded animals so we need to provide less animal food to obtain 1Kg of high quality human food. Mammals and birds instead will use a considerable amount of this energy just to keep itselves several degrees warmer than the environmental temperature day and night.
Is better also because reduces waste. Fishes are aquatic and have swimming bladders. Its bodyweight is carried by the water, so you are not investing in growing several Kg of heavy unedible skeletons that will end in the trash. There is more food in 100Kg of entire fishes than in a pig of 100Kg, and you'll need to allocate less volume of garbage dump.
At difference of agriculture or industry, if you have a farm fish you need to care for keeping the quality of the water in reasonable levels for life beings. This water is still available to other animals and plants.
More efficient use of energy and water and less waste is the definition of environmentally friendly. The ugly truth is that the number of humans is ever increasing but resources are limited. Cows, sheeps, pigs and poultry use also antibiotics and spreaded parasites and diseases in the past and of course the arrival of massive quantities of them 200 years ago was also a neverending 'environmental nightmare' for lots of species of trees, flowers or insects (and a bless to other, just like salmon farms). The difference is that you can have more people with aquaculture in the end.
First of all is more efficient. We produce human food via cold blooded animals so we need to provide less animal food to obtain 1Kg of high quality human food. Mammals and birds instead will use a considerable amount of this energy just to keep itselves several degrees warmer than the environmental temperature day and night.
Is better also because reduces waste. Fishes are aquatic and have swimming bladders. Its bodyweight is carried by the water, so you are not investing in growing several Kg of heavy unedible skeletons that will end in the trash. There is more food in 100Kg of entire fishes than in a pig of 100Kg, and you'll need to allocate less volume of garbage dump.
At difference of agriculture or industry, if you have a farm fish you need to care for keeping the quality of the water in reasonable levels for life beings. This water is still available to other animals and plants.
More efficient use of energy and water and less waste is the definition of environmentally friendly. The ugly truth is that the number of humans is ever increasing but resources are limited. Cows, sheeps, pigs and poultry use also antibiotics and spreaded parasites and diseases in the past and of course the arrival of massive quantities of them 200 years ago was also a neverending 'environmental nightmare' for lots of species of trees, flowers or insects (and a bless to other, just like salmon farms). The difference is that you can have more people with aquaculture in the end.