They included cold-blooded organisms that ranged in average lifespan from 11.6 days for the copepod (small crustaceans) Arcartia tonsa to 74 years for the pearl mussel (Margaritifera margaritifera).

他们包括平均寿命只有11.6天的桡脚类的动物（一种小的甲壳类动物）非洲的汤氏纺锤水蚤，和可以存活74年的珍珠胎贝(珠母贝)。

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The pearl was mellow, full and great, it is a priceless treasure for human, but a accident with pain for died freshwater mussel, maker of the pearl.

这粒珍珠圆润硕大，在人类而言是无价之宝，可是对珍珠的制造者，死去的蚌来说只是一个带了些痛苦的意外。

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According to Scottish Natural Heritage, 72 of Scotland's rivers support reproducing populations of freshwater pearl mussel including many of the world's largest populations.

BBC: Freshwater pearl mussels