Denshi Jisho — Online Japanese dictionary

きす sillago (any fish of genus Sillago, esp. the Japanese whiting, Sillago japonica)
Noun, Usually written using kana alone 
にぎす deepsea smelt (Glossanodon semifasciatus)
Noun, Usually written using kana alone 
しろぎす Japanese whiting (Sillago japonica)
Noun, Usually written using kana alone 
とらぎす harlequin sandsmelt (Parapercis pulchella)
Noun, Usually written using kana alone 
鬼坊主 おにぼうずぎす black swallower (Chiasmodon niger)
Noun, Usually written using kana alone 

You can also

Look up kanji details for *鱚.

Try a Yahoo Jisho search for *鱚 .
Try a Goo Jisho search for *鱚 .
Try a Google search for *鱚 .