The Northern California Fly Fishing Board

I put this up on a couple other message boards, but I wanted to share with folks here as well.

As I was asking some friends about possible content for my bonefish blog someone recommended I look into some of the research that had been done about bonefish C&R and predation/mortality rates.

What I ended up coming across was pretty interesting stuff. I've read other studies about trout C&R and trout seem to be pretty resilient, really. A saltwater environment is much different from a trout stream, however... as there are cudas and sharks that love munching on bonefish.

The take away from the two studies I read on C&R bonefishing had these nuggets...

- A fish that lost equilibrium was about 6X (30%)as likely to suffer immediate predation as a fish that did not lose equilibrium.

- Loss of equilibrium was, in almost all cases, the result of extended (more than 15 seconds, as I recall) air exposure and/ore extended handling.

- Fish that did not lose equilibrium had a pretty good chance of surviving (5% mortality)

- Flats with visibly more predators resulted in much higher mortality (in one angler's experience in the study he had 80% mortality in one day on one flat, all due to predation and all within 2 min of releasing the fish)

- Warmer water amplified the impacts of handling/air exposure.

- Bonefish are most at risk immediately following release and if they can survive the first few minutes after release, they will likely survive the C&R experience.

The implications for C&R bonefishing might mean that on warmer days, or on flats where more predators are visible, you may want to limit or eliminate air exposure or excessive handling of the fish... meaning probably no out-of-the-water photos.

Just some food for thought for those of you who head to warmer climes to chase after bonefish.

Here's the link to the blog post, which has a link to the study.
http://wp.me/pCfe5-bz

B-

Interesting stuff Bjorn and it could be expanded to warm water fresh water fish as well, especially bluegill and crappie. No, I am NOT writing this tongue-in-cheek. I fish one small but fairly deep lake here in Mendocino County. I have noted that in the spring I catch a LOT of very big bluegill (some up in the 9" or bigger range) and have caught some super big crappie (3+ lbs) as well. I stopped using a 3wt rod on these fish for two reasons. One, because they are much bigger than the norm I have to fight them longer to get them tamed and to hand. Two, I have noticed several times large black bass chasing, and in one case in sight, catching and eating these fish. So I went to a 5wt where I can horse them a lot more, get them in and let them loose with minimal stress. It's the hookup that counts anyway.

Interesting point... I never really think of predation when it comes to C&R. This opened my eyes a bit.

Another interesting thing was that the Lemon Sharks appeared to take the same line that the released bonefish would take... seems they may be picking up on the scent trail of the stressed fish... probably trailing cotisol (sp?).

B-