Thank you, gentlemen. Excellent responses.

Are there any characteristics possessed soley by steelhead that may help to separate them from other salmonids? Different air bladders, muscular densities, third nipple? Sonar, albeit MRI, ultrasound, or military grade infrared spy satellite is the answer, we just haven't perfected it yet or we can't afford it. Let's keep a fly-eyed perspective, folks.......