If you have a freezer handy, you can put the fish,whole into a fishbag,press out the air and it can be frozen intact, within an hr. of catching. It will keep up to 9 months. Just thaw and debone if you wish and it will be fine...If you are planing on continuing to fish, I would keep a cooler with some fresh cube ice in the car, bleed the fish out, clean your fish, (leave the head and tail on for transport) and immediately pack the cavity with ice and cover the fish withice, as well. This will ensure your catch stays as fresh as possible. Putting a dead fish back into 50-60 degree water for a few hours, is not the best way to look after your catch, and will almost always guarantee a pretty unappetizing meal............Ortho