不仅仅是金枪鱼，沙丁鱼，鲭鱼和其他鱼类也在减少。
It is not only tuna but sardine, mackerel and other fish that are in decline.
原因之一是，大多数公司使用的种鱼类，都降低其食物链，如鳕鱼和沙丁鱼，它们积累及少量的汞。
For one thing, most companies use species of fish that are lower on the food chain, like cod and sardines, which accumulate less mercury.
渔船可以在接近海底的地方捕到鳕鱼和其他鱼类，而不是沙丁鱼和乌贼。
Trawlers in the area obtain hake and other fish that are at or near the bottom, not sardines and squid.
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