What does 養殖は天然物の単なる代替ではいけません。諸外国の例を見れば、天然にはない付加価値を与えることもできるはずなのです。日本の養殖漁業は、長らく天然物の安価な代替品を供給してきました。もちろん、日本の技術力は高く、品質も天然物と遜色ないところまできています。しかし、それだけでは世界的な競争は持ち得ないでしょう。いかにして、商品としての新たな価値を生み出すことができるか。日本の養殖漁業に問われているのは、そういった創造性です。 mean?

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Farm-raised fish ought not to be replaced by natural ones just only to replenish deficits in market.
Like we see in other countries, farm-raised fish still have a room to be added characteristics that naturally raised fish don't have.
Fish farmers in Japan have long been providing cheaper items to compliment the number of natural fish in the markets.
With highly advanced technologies, the fish supplied by farm fishers in Japan par with natural fish in quality, nevertheless that doesn't necessarily mean Japanese farm-raised fish can survive in a highly competitive global markets.
It is that creativity that Japanese farmers are being asked to put in their products.
By doing this, they can make them new in the markets by adding a virtue which consumers recognize them as new "products".