There are actually a lot of slicks in the water as TOO explained. Well done TOO Besides the grass slicks there are organic oils from decomposition in the bay floor that can float up and make a slick, passing boats with oil leaks, a jet ski burning too rich even and large schools of bait fish. Some look entirely different,,, some don't. Also when crabs eat bait from crab traps... oil is released and makes a slick... in fact that leads me to the number one rule of fishing slicks... make sure you check up wind for crab trap buoys before fishing a "trout" slick.
There are also a lot of hypothesis on slicks other than the regurgitation mentioned above..which is correct but not the only method. Just in a normal feed when a trout eats a small drop of stomach content can be forced out and that's all it takes. a tiny droplet... even seen fish in tank [censored] when scared? do you think fish in the bay / gulf do that? eat an oil baitfish and the poo is going to be oily too at least to some extent.. I was first introduced to this by my fish tank expert Spencer...LOL. but it's true for trout as well...
The TroutSupport.com DVD "Find the Fish Catch a limit" shows exactly what all these slicks look like on the water and how to tell the difference and how to work them to find the fish that made them. There are tons of testimonials on the site of fishermen young and experienced that have utilized the techniques. Actually, if you watch the free clip on the site you could almost figure out how to do it but theres tons more info on the site.
www.troutsupport.com all the DVD's have a 110% money back guarantee as well.
Other slicks can form on the water besi