On the contrary, vision does have some bearing on the subject. How ever my last post if read between the lines also has a bearing on taste flavour and attractiveness of bait. for example the aroma from floaters either self made or lets say chum mixer is without doubt something that cannot be neglected. For the aromas travel along the upper layers of a water, fish do not only follow said baits but will also travel some distance to intercept it. On the subject of what I call line baiting it is possible to leave paths of bait(I do not mean loads of bait but a line of bait lets say ten baits covering forty yds. I will not discuss my baiting patterns but they do depend very much on the willingness of a fish to follow them, ie is the bait attractive enough to cause them to follow a scent trail. It is only when the fish is about forty feet away from the bait (in perfect conditions) that the fish can actually see the bait. the scent of the bait coupled with a possible visual sighting only enhances the fishes curiosity. It is usually at this point that the fish will do something very curious. It will slow down its pace to a near stop and proceed with caution. ( I am talking about wary fish.) if anything is amiss on its approach it will ignore the nice smelling object. If the angler has done everything correctly then the chances are that the fish will investigate the bait and may even take it. One other thing is that once a bait is taken, the aroma is memorised and this leads to the fish proceeding to the next bait. So curiosity of aroma can be created from some distance away. If on the other hand a bait has been introduced to a water over a long period then it is probable that the fishes (not only carp but any fish) receptors will be stimulated in turn causeing the fish to search for its meal, this i suppose can lead to a fish ignoreing all other aromas. Which would conclude that the primitive brain can differenciate extra good food to not so good food. The flavour of a food source would be the switching on factor, but the ingriedients would be the source of nutrition. The olfactory organ in fish is highly developed and should not be underestimated for once a fish has got a smell for something everything else will be ignored. As I said earlier the items that a fish eats in a natural setting would be seasonal let us say bloodworm, at these times it would be difficult to catch on anything but bloodworm. if on a pressured water then the fish will still eat what it prefers and will ignore other baits. But we have a delema, because a bait that does not work on one water could be hauling them out of another. I like you, do believe that some substances do disagree with the fish and that others are agreeable. But it is a matter of trial and error in finding them. For example a bait that reacts in water to produce mild toxic substances ( bait goes sour or off) can cause a fish to vacate an area I mention this because some baits produce non toxic effects and will be eaten. Again we are reaching the world of acids and micro organisms. Meats, blood,grains,vegitable material, fish etc all produce different substances over a certain time span some are to a fishes likeing others are not. Not quite the same but I know I would not eat a week old pork chop that had been left on the shelf. But I would eat a week old box of cornflakes.

Animal,

I'll be brief. This is a thread discussing proteases and chemical stimuli, for that sight is not included. I'll wade through the rest of the post later.
R

@roobish

I cant imagine that you havent found the reason to why we want to ad proteases to our base-mix ( sometimes ) after readig the 11 pages and postings of this thread/topic - whats the matter with you?

could be i am useing a substance that is good for the fishes eye sight, like carotene, a substance found in most natural aquatic animal life especially crustaceans. It is evidently found in carrots too. what ever helps the brain of a fish to function would also help the eyes to function. Why do we use all kinds of tene's in our baits? because we cannot create anything like a natural bait. the answer to the question of can a fish differentiate between additives in a bait that is single bait is know, for two many factors exist. A fish can however differentiate between two different baits(without flavour added) ie bread vs narm bread, both similar both different taste. Does a fish know what is good for it the answer is yes it does. why because if it was not good for it it would not eat it.