" Its the same reason why people will continue to pay high prices for property in Singapore, land is a finite resource, as it becomes less and less, prices will skyrocket..."

 

Not wrong with the above statement if there are no other alternatives.   First, fish food is not a must on every table everyday. There are alternatives as food.  Second,  there are aquaculture sea and freshwater fish (e.g those rear in ponds) as an alternative.   "   Globally, aquaculture supplies more that 50 percent of all seafood produced for human consumption – that percentage has been and will continue to rise. Conventional wisdom holds that traditional fisheries are producing near their maximum capacity and that future increases in seafood production must come largely from aquaculture."   When sea fishing getting more expensive because of shortage in supply,  aquaculture fishing   will become   more viable.    Any additional investments to acquire more seafishing ground will only benefit the aquaculture fishing..

http://www.nmfs.noaa.gov/aquaculture/faqs/faq_aq_101.html