In most coastal areas,fish are an integral part of the diet, however increasingly fish is becoming extremely expensive and difficult to find due to a variety of reasons.
As technology has advanced, it is far easier for fishermen to catch all the fish which is naturally available in a particular area in the same period of time using radar technology to find their exact location. Since there is little regulation of fishing, many fishermen who are only interested in short term gains, are catching all the fish available in the area with the latest technology and equipment, leaving very few fish in the sea or river for breeding.
In Western countries, the leaders are more far sighted, less greedy and they have implemented rules fairly strictly, so the fish like salmon are flourishing. When almost all fish are being caught, the fish catch in the next year will be naturally less.