Statements :All fishes are grey in colour. Some fishes are heavy.

Conclusions :
I. All heavy fishes are grey in colour.
II. All light fishes are not grey in colour.

Explanation:-

Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some heavy things are grey in colour'. I is a cumulative result of this conclusion and the first premise. Thus, only I holds.