Hacker News new | past | comments | ask | show | jobs | submit login

we're also feeding fish meal (from the ocean) to farmed salmon in aquaculture operations

i think it was Cousteau who said that farming carnivorous fish like salmon was just a terrible idea. it requires a really high ratio of fish meal protein to salmon protein, something like 6 to 1.

we'd be better off farming more fish that behave like Tilapia. they can eat their own excrement.




I think you have to work on that pitch a little. Eats its own shit?


Whatever, Tilapia is tasty and ecological.


Yes, I like Tilapia too. But the pitch may need tuning nevertheless. :)


Do you eat rabbit? Rabbits eat their own shit.


I've lived on farms with dogs, cats, pigs, goats, horses, chickens, etc. The only farm animals I haven't seen eat their own shit are cattle, but frankly it wouldn't shock me to make that discovery someday.


you've got to be shittin me. I suppose you assume the animals were in distress from captivity.


Certainly not. I've lived on farms most of my life, and I have no moral objections to farm animals, their lot in life, or their occasional coprophagy impulse. It really isn't that weird to eat shit. Has anyone alive really not seen a dog do it?

Did you really create a new account to make that comment? What's the motivation there?


Because they need to recyclate some specific kind of valuable vitamin created by bacteria from rabbit stomach, I think, so they need to pass two times by the gut the same material. In any case what rabbits ruminate does not apply to Tilapia, is a different kind of animal.

If Tilapia arent feeded, they will eat algae and smaller Tilapia. Small tilapia fry can survive eating microbes and algae that grow in organic residues for a while, but this is a different question. Giving cattle the minimum to just survive is not the same as farming cattle.


I understand the logic of this phrase, but I don't see Cousteau eating a lot of herbivorous fish in his films. When they fish and cook fishes in the Calipso, are often from carnivorous species. Because carnivorous fish are delicious, and herbivorous fish often just so-so. There is not reason to put your money in a product that nobody will buy.

On the other hand, Tilapia needs proteins. Few animals can trive eating just its own discarding products, void for definition of anything that would merit to be recicled by the fish metabolism.

If their fish (or cattle, or poultry) is so hungry that start to eat their own excrement, they are just making a very poor product, and scamming their customers.


In Australia where Basa fillets can go as cheap as $5/kg in a supermarket (Chicken breasts are can be as cheap as $9/kg for reference), some people don't buy Basa fillets. Why? The reputation of basa is that it's farmed poorly in Vietnam where people shit in the same farm that grow fish.

Note: Basa is a type of catfish that can grow well despite dirty water.


why not grow crickets for salmon feed?


i personally would not object to that. i guess farms are not set up to do that (yet).

i've heard that wild sockeye salmon eat a lot of insects and therefore wind up with lower levels of mercury than, say, tuna. farmed salmons is not sockeye.




Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: