There the tuna are raised in sea pens, or from small-boat fishermen who catch only one fish at a time.
(the tuna; are raised; L:in sea pens, or from small-boat fishermen; L:There) (small-boat fishermen; catch; only one fish; T:at a time)
the tuna small-boat fishermen
are raised catch
L:in sea pens, or from small-boat fishermen L:There
only one fish T:at a time