My jetski as well as many newer models have a big storage area in the front. I put them in there and bend them in half if needed.

just bring some string with ya and loop it through its gills.

I thought this was an interesting option...
http://www.badcoteam.com/articles/264/1 ... Page1.html

The rescue sleds are useful for extra storage. But they are expensive! I am in the works with a manufacture to create something more suitable and a cheaper alternative. It should be ready later this year.

Take a picture than set er free.... I seen some Hawaiians use Surf board tow in attachments to bring in Marlin....

Dakine makes fishbags of all sizes and types.

Whatever you do, do not put them on a stringer and back in the water. There are way too many sharks in the gulf.