farms are a different story sea, tho often even worse than wild fisheries. the baseline doesn't apply to farmin as it's farmin, not fishin! however, many species that are farmed are from higher up in the food chain. so inevitably, fishin is required to feed the farmed fish which makes the farmin completely unsustainable. on top of this, due to the density of animals in the farms - n this is of particular concern in open loop systems - large amounts of antibiotics n antiparasitics are used to treat the stock for infections. this then goes out into the surroundin environment, causin serious damage. on top of this are the high levels on pcbs recorded in the flesh of these fish, chemicals which are damaging to both the environment n to our own health (causes cancer).
don't know much about clam farms so can't really comment, but i expect the feed n antibiotics issues still apply. closed loop systems reduce the enviromental impact, but unless feeding algae grown in closed loop systems too, there are still sustainability issues to contend with. do you know how the clams are fed n grown in the tridacnid farms sea?
no easy solution sadly! but there are solutions are there, they just aren't bein utilized.
u ever seen bobtail squid sea? (that might even be one in the photo) now those are cool squid! would love a few of those as pets, i must admit.
neverbreak