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From Everything I Read On Bulbapedia And Playing The Pokemon Games There is no decrease in chance of finding a Pokemon other than Feebas In Ruby Saphire Emerald( 6 Fishing Spots) And Diamond Pearl Platinum ( 4 Fishing Spots)
The Percentages For The Area On Certain Pokemon are Higher So You Catch Certain Pokemon More Frequent!
Source: Bulbapedia And Personal Usage
Nope! Tbh, fishing in the same spots and hooking a Pokemon each time (I use the Suction Cups ability that can be on Malamar or octillery) actually RAISES the rate of getting a shiny water type! This is called Fishing Chaining (I think). Also ik this answer is a bit late but oh well xDHope I helped. :)
If you fish in the same spot, you are probably gonna end up with the same Pokemon over and over.Your chances of fishing a Pokemon are basically at random.You might fish a Pokemon. You might not.
Source: Bulbapedia