小知識(shí)
鲉形目鲬亞目魴鮄科綠鰭魚屬Chelidonichthys的物種,如在我國(guó)分布的綠鰭魚C. kumu(俗稱綠翅魚、鶯鶯魚),胸鰭長(zhǎng)而寬大,兩側(cè)胸鰭末端前下方各有3根指狀游離鰭條。棲息于淺海沙泥底質(zhì)水域底層,常以胸鰭游離鰭條在海底匍匐爬行。這3對(duì)游離鰭條能像手指一樣探查沙泥中有沒(méi)有小螃蟹、小蝦等獵物。
綠鰭魚/ Max Finger,CC BY-SA 4.0,Unaltered
綠鰭魚,可見(jiàn)胸鰭游離鰭條/ Bernard Spragg. NZ from Christchurch, New Zealand,public domain
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