Is tuna farming harmful for the tuna?

In regard to the passage, the author states the problems with the tuna farming which is feeding the fish in ocean cages till they are big enough to be sold. However, the lecturer is quick to point out the solutions to the problems stated. In fact, the lecturer explains the solutions in details with each problem proposed by the author. First and foremost, the author says in the article that farmers catching vast amount of young wild tuna causes the decline in the tuna populations since female tuna can't lay eggs in cage. Nonetheless, the lecturer pointed out the solutions by saying that as they can now inject hormones to the female tuna to lay eggs without imposing health risks, the farmers no longer need to keep the young tuna in captivation. Secondly, the author mentioned that tuna need a massive amount of high-protein food which can be rather expensive for the farmers and, thus, not making enough profit from tuna farming business. On the contrary, the lecturer disagrees with this opinion by proposing the solution of processing high-protein containing plants to feed tuna. The lecturer believes that this will not only be low-cost but also contain all nutrients needed by tuna. Finally, the author concluded the article by describing the parasite that lives on the tuna and can endanger them to death. Of course, the lecturer had the solution for this by saying that there is a treatment found for the parasite. The lecturer mentioned the situation in Southern Australia which reduced the number of parasites when the cages are moved into the deeper sea. To sum up, both the author and the lecturer hold conflicting views and it is clear that they will have trouble finding common ground on this issue.