幼魚: young fish / 養魚: fish farming, fish breeding, fish culture, pisciculture

The hiragana syllable ぎょ (gyo). Its equivalent in katakana is ギョ (gyo).

人魚: a merperson

作業: work, operation / サ行: the words starting with sa

作業: work

実業家: industrialist; businessman

as hard as one can; to the best of one's ability

paternal grandfather

great-grandfather

great-grandfather, especially one's grandfather's father