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The aquarist could own a fish only or reef aquarium Esa Lindell Jersey , whichever it is there is one action that is very low in popularity - catching a fish.

The natural reaction of a fish when anything seemingly threatening approaches is to move away and hide. This is the survival instinct from the wild. It is the same reaction as hiding when night time approaches. Failure to get out of harm's way and hide could mean death.

In the aquarium the fish have their wild instincts. These do become modified to an extent, for example when the aquarist approaches the aquarium the fish could come to the front in anticipation of food. Overall though there isn't much change, generally introduce a new fish and the resident fish usually back off until they are confident of safety in the new fish's presence. Likewise, if the aquarist puts a net in the aquarium the fish will move away rapidly as it is an unknown presence.