His seemingly obsessive concern for the eggs is for good reason.它對魚卵看似過度擔憂其實有充分的理由

concern for:對 ... 的關心； 憂慮

His concern for the poor is only a pose.

他對窮人的關心只不過是做做樣子罷了。

The teacher showed particular concern for the disabled child.

老師特別關心那個殘疾兒童。

she's in charge here and if his efforts don't match to her standards, she'll get rid of him.這里是母魚當家作主，要是它認為公魚的努力不夠，就把它一腳踢開

in charge:負責；主管

I am in charge of financial affairs.

我職掌財務。

I gather that he is the one in charge.

我猜想他是負責的人。

get rid of:擺脫； 除去

Let's get rid of this moldy old furniture.

咱們把這件老掉牙的舊家具扔掉吧。

The fat boy went on a diet to get rid of his excess weight.

這個胖男孩節制飲食以減輕過量的體重。

So he focuses all his efforts on keeping them clean and healthy.它用全副心力保持魚卵的潔凈和健康

focus on集中在

You should focus your attention on your work.

你應該把注意力放到工作上。