What a beautiful place! Fishing is part of my work and when I catch a big amount of fish in for example nets I think its really important how you treat the fish! Of course its hard to be perfect and kill or release the fish as quickly as you do but a good plan and picking the fish from the nets into a bucket of water where it can live without suffering until you kill it is pretty much the best I can do. That is also how you get the best quality fish for customers :) unfortunately the low amount of fish in our waters (due to polution and bad bottom quality) is making it pretty hard for the fishermen.
Have a good trip! :)