thanks for making this thread, its pretty interesting.
sharks have the abilitly to sense fear from a decent distance, i want to say its electrolytes or electro something or other that is released when something displays fear and the can sense it. ( not sure if its electrolytes or whatever but its something like that) and as im sure many of you are aware they can smell a drop of blood in the water. they also are attracked to loud noises/movement.
dolphins, whales make noises communicating. a fish in your tank nipping at another fish is communication, it simply means get away, lol but communication none the less. clownfish "twitch" which ive heard is a sign of dominancy but not sure on that. pistol shrimp pair up with watchman gobies and the shrimp will dig the hole, the goby will keep a look out. when the goby sees danger it flutters its tail and the shrimp returns to the hole. here is communication between 2 different species, pretty amazing.
as for kym saying its amazing that fish can "smell" you should see my tank go wild over 1 squirt of food. the fish go crazy, the corals come to life, nassarious snails emerge from the sand over a drop of food hitting the water so its apparent they have some sort of sense too.
i dont know much on the bubble code theory, lol but a bettas bubble nest as well as flaring is communication.
if you think about it, all animals have some sort of way of communication, wether it be verbal or non-verbal. ever wonder how ants walk in lines? they to are communicating by using their feelers for scents and touch of other friendly ants. pretty crazy stuff.
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