Spine Cheek Gudgeon

Amphidromous. Refers to fishes that regularly migrate between freshwater and the sea (in both directions), but not for the purpose of breeding, as in anadromous and catadromous species. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.Characteristic elements in amphidromy are: reproduction in fresh water, passage to sea by newly hatched larvae, a period of feeding and growing at sea usually a few months long, return to fresh water of well-grown juveniles, a further period of feeding and growing in fresh water, followed by reproduction there (Ref. 82692).

Distributed from the tidally influenced area and the lower part of the freshwater area in theTeima River on Okinawa Island. Occurs in brackish estuaries, freshwater creeks, marshes, and rice fields (Ref. 54520). Feeds mainly on crabs and aquatic snails (Ref. 54520).

Adults inhabit brackish estuaries and lower reaches of freshwater streams, usually on mud bottoms (Ref. 44894).

aquarium: commercial

分布於西太平洋區海域，包括日本、臺灣、馬來西亞、印尼、菲律賓、馬達加斯加、瓦努阿圖等。臺灣分布於西部、西南部、北部及東北部等。

中小型魚類，不具食用經濟性。

第1背鰭：Ⅵ；第2背鰭：Ⅰ/ 8~9。臀鰭：Ⅰ/ 8~9；胸鰭：14~16；腹鰭：Ⅰ/ 5；尾鰭：16。縱列鱗 47~53；橫列鱗 13~15；背鰭前鱗 31~38。鰓耙 2+5。體長為體高的3.9~4.6倍；為頭長的2.8~3.4倍。頭長為吻長的3.8~4.8倍；為眼徑的4.2~5.7倍；眼間距的3.2~4.2倍。尾柄長為尾柄高的1.7~2.1倍。體延長，身體前部呈圓筒形，後側扁。背緣、腹緣微微隆起，尾柄較長。頭中大，吻部寬鈍，稍低，略平扁；頭後隆起，高而側扁，其頭寬大於頭高。吻短且鈍，平扁，吻長約為眼徑1.0~1.4倍。眼小，上位，稍突出。兩眼間隔寬平，約為眼徑的1.6倍。眼下方臉頰部具有5條橫向感覺乳突線(L1~L5)，而L2、L4感覺乳突線向下延伸，穿過臉頰中央L8的縱行感覺乳突線。鼻孔每側兩個，分離，相距較遠：前鼻孔圓形，具有短管，接近上唇；後鼻孔小，無鼻管，在眼睛的前上方。口大，前位，口裂向後延伸至對應於眼睛中位或稍微偏後。上、下頜齒形狀細尖，多行，上、下頜的內列齒較大；鋤骨無齒。唇厚。舌大，游離。鰓孔寬大，向前向下延伸至鰓蓋骨後緣的下方。前鰓蓋骨後緣中部有1根向前下方彎曲的小棘。鰓被架6條。魚體具小型櫛鱗，頭部、背側部與胸鰭基部則被有圓鱗。吻部和下頜無鱗片。無側線。背鰭2個：第1背鰭起於胸鰭基部後上方，第3、4棘最長，後端幾乎延伸至第2背鰭起點；第2背鰭較長，平放時不延伸至尾鰭基部。臀鰭起點與第2背鰭相對。胸鰭寬圓、呈扇形，中側位。腹鰭小，起點於胸鰭基部的下方，內側鰭條長於外側的鰭條，左、右腹鰭靠近，但不相連、癒合，腹鰭末端遠離肛門。尾鰭長圓形。頭部及體側為棕褐色至黑褐色，腹側淺色。體側無條紋及斑塊，有時或有白色斑點；頭部自吻端經眼至鰓蓋上方及頰部自眼後至前鰓蓋骨各有1條黑色條紋，有時條紋並不清晰可見；頰部及鰓蓋部散布有許多不規則的黑色小圓點；項部及鰓蓋為灰黑色。背鰭、臀鰭和尾鰭為灰黑色，各鰭均有由黑色點排列形成的多行條紋；腹鰭和胸鰭為淺灰色。(林上智、林沛立編寫 2012/10)

暖水性淡水小型底棲魚類，多棲息在泥質底面上。生活於江、河下游及河口水域。大多夜間出來活動、覓食。屬於肉食性，成魚攝食小魚、小蝦、蟹等。