有 YUU, U, a(ru) - be, exist, have
盧 RO, meshibitsu - bowl
於 O, o(keru) - where
覃 TAN, no(biru), hi(ku), oyo(bu) - lengthen, stretch
石 SEKI, SHAKU, ishi - stone
They all take the "fish" radical (魚 GYO, sakana, uo - fish) to become other characters.
鮪 I, YUU, maguro - tuna
鱸 RO, suzuki - sea bass
鯲 dojou - loach
鱏 JIN, SHIN, ei - ray
鮖 ishimochi, kajika- bullhead