ぎょかく is the standard on'yomi. 漁 (ギョ) means fishing, and 獲 (カク) means to catch or obtain. ぎょがく incorrectly applies rendaku to 獲, ぎょかくう adds an unnecessary prolonged vowel, and ぎょかい misreads 獲. This term refers to the total catch of fish or seafood from fishing activities, or the fishing yield, indicating the quantity or amount of marine life caught.

ぎょかくは標準的な音読みです。漁は「漁業」、獲は「獲物」の意味。漁業で捕獲した魚介類の量や、その行為を指します。ぎょがくは獲の連濁誤り、ぎょかくうは不必要な長音です。