<p>The young fish WERE(a) very tiny, yet each of THEM ATE(b) many times ITS(c) own WEIGHT IN(d) solid food every day. No error(e)</p>
<p>The actual answer was E. Wouldn't the answer be A or B since the word "fish" is singular.</p>
<p>The plural of “fish” is “fish” and thus it can be singular or plural and in the sentence it is used as plural. There are a number of English words like that designed to befuddle anyone who is not a native speaker of English. Other examples: moose, scissors, offspring, deer, aircraft, pants, you, and now because modern usage has essentially done away with its singular the word “data.”</p>
<p>What do you think the plural of fishes would be? “fishes?”</p>
<p>Fishes is another plural of fish that is little used in everyday speech in the US or Canada.</p>