挑食的蚊子

Farmed Trout Bred to Fatten Up Fast

Half of all fish people eat worldwide now come from fish farms. So farms need to do more to keep up with demand.

And If we look to the future, at today's per capital capita fish intake around the world . we will would need to double aquaculture production.

Ron Hardy is the University of Idaho's Director of Aquaculture Research. He presented his research at a the recent International Symposium on Fish Nutrition and Feeding in Sun Valley, Idaho, which him he also chaired.

In the wild, rainbow trout eat insects and other, smaller fish. But Hardy says there aren't enough little fish to feed larger fish in the wild and still meet market demand as the human population increases. So he's used selected selective breeding to create strains of farmed fish that get by on food that's less expensive than little fish . - feed made from soybeanscorns , corn and weedwheat.

Some of the farmed fish really thrived. thrive: 16 years ago, Hardy had to wait a year for a one-pound trout. These days, his efforts yield trout up to four times as large in the same amount of time.

So, it become like would be kind of like if you are were going to you know breed a, I don't know , box ? dogs. So we've got everything from Rottweilers to , you know , little Scotties or whatever.

But the farmed fish aren't are not completely vegetarian. Soybeans don't have skeletons, they don't have bones . and the bones in fish meal are a major source of mineral minerals for the fish, for example. And much like humans, fish diets require omega-3 fatty acids, not found in terrestrial plants. So Hardy has to add a little fish-oil back into the plant-based feed. For those of us without waiterswaders, this kind of aquaculture is our best shot at a fish fry.

• Words worth to be remembered:
• aquaculture: n. 水产养殖；水产业
• get by: phr. 过得去；过活；通过
• trout: n. 鳟鱼，鲑鱼
• wader: n. 步涉者，涉禽类，钓鱼用的防水长靴

譯文

Chaochen Wang 王　超辰
Assistant Professor

All models are wrong, but some are useful.