Some could tolerate the cold, but were not too tasty; others were large and flavorful, but required a long maturation period. Scientists bred to achieve a hardy, plump, tasty, quick growing fish.
在一百多品種中，有的體大耐寒，但肉味較差；有的體大肉佳，但成長期長……，他們將這些種魚不斷進行雜交育種，期望能培育出兼俱各種優點的新品種來。