Yes. A lot. Especially ghost nets and other issues. Land animal production has issues with cruelty and pollution but it’s nowhere near as bad as seafood.
I mean... The comment is suggesting a false dichotomy (possibly without meaning it) that options are either seafood or land animal production. I'm not vegan, not even vegeterian, but the only answer I can give in good faith is that "I have to eat" is not a good argument, there's alternatives better for the environment than seafood _or_ land animal production.
No vegan even commented, I find vegan-bashing so much worse than vegan-evangelism. I'm seriously getting vegan fatigue fatigue.
If (1) our current system is unsustainable, and (2) we can't make a difference, then we are, by the most basic rules of logic, (3) headed for a collapse of our current system.
It's a bit strange how often people will aggressively make either point 1 or 2, and then concede that the other is also true, but then decry the 3rd, which follows from 1 and 2, to be ridiculous pessimism.
At some point everyone will be vegan ascetics forever apparently. Including all of our descendants, who will recognize and appreciate how enlightened we are. Curiosity and discussion about other solutions cannot be tolerated lest it jeopardize the coming worldwide ascetic veganism forever awakening.
Facts seem valuable when making individual decisions that affect the planet, especially when we wring our hands and wonder when someone else will do something to solve our environmental problems.
Some of the answers are right there in front of you every day.
To me the big difference is that seafood affects a natural ecosystem and species vs. farmed land animals.