firechild
First Grade
- Messages
- 8,067
^Whats your issue with farmed salmon? The stuff from Tassie and NZ is still pretty awesome IMO. Fish farming is necessary if we're going to sustain fish stocks into the future, no way we can meet demand any other way (and some species like tuna are pretty marginal even when farmed due to the amount of pilchards needed to keep them fed)
When I was studying aquaculture at uni we had to write an essay on sustainability of aquaculture and it was a real eye opener. I was of the same opinion as you but the reality is most aquaculture does more harm than good. You mention feed which is a good example. I mentioned the feed conversion ratio earlier in the thread and for the average species that has a FCR of 1.5 that means over 1 tonne of fish from a lower trophic level than the farmed species (in many cases Sardinops spp.) are caught to produce 1 tonne of farmed fish. By fishing at a lower trophic level it does a huge amount of damage to the natural food chains. Add to that damage done to various environments due to waste and runoff which can effect breeding/feeding grounds for wild populations of farmed species and their prey. This is offset in some (very few in reality) cases by polycultures but there is still damage done. Some governments have forced farms to change methods by making farms release water from upstream to where they take it from, this means that if they pollute waterways then those pollutants will end up back in their own farm.
I'm not convinced yet that many farming methods are sustainable but I believe that we must pursue farming as an option because developing new methodologies will make it more sustainable.