The baby fish are easy prey for birds.

这些小鱼很容易被鸟类捕食。

《牛津词典》

Some fish do not spawn until maturity. If you catch them before that and you've no baby fish produced for the next year.

有些鱼要到成熟期才产卵。如果你在成熟期之前就开始捕捞，那么你明年就没有鱼籽了。

youdao

Only baby fish can fit inside the tiny glass cube that is the world’s smallest aquarium.

只有很小的鱼苗才能在这个世界上最小的鱼缸内自由游动。

youdao

Researchers at the University of Bristol in England discovered similar movements among baby reef fish several years ago.

VOA: special.2010.08.10

This current policy is expected to be a baby step of sorts after the Fish and Game Commission figures out how to implement the fishing ban and how to enforce it.

NPR: California Cuts Coastal Fishing to Restore Ecosystem

Several previous studies have shown that eating fish during pregnancy helped in the baby's brain development and in reducing the risk of post-partum depression.

WSJ: Fish Oil Provides Little Benefit for Pregnant Women

To compare this to fish, one would have to extract the mercury out of the fish tissue and inject it into a one day old baby.

FORBES: ADHD, Fish And Mercury Exposure During Pregnancy -- What's The Connection?