Saw this one in a country stream, a relatively large in size--guess around 5 inches in length, strange is the saw like feature beneath it's lower jaw, could it be for attaching itself on the bottom again the water flow?

[ 本帖最後由 kingarthur 於 2010-10-20 00:57 編輯 ]

cichlid (棘鰭類熱帶淡水魚), introduced spieces and most diverse in Africa, feeds on anything but prefer algae.  Offers parental care for their eggs and larvae.

異鱲 Predaceous Chub
Male

[ 本帖最後由 rosara 於 2010-10-19 17:03 編輯 ]

雖然是常見魚，地點都係不寫為妙，以免Ｄ人誤會熟人就乜都得。

you sure this was 異鱲 ?

Agreed. Disclosing location definitely not necessary no matter whether it is mammal, fish or insect involved in the discussion. However, just wondering what you meant by 熟人就乜都得? Am I missing something here?

我唔敢話好 sure，不過睇到佢扇形既 anal fin，面部及唇部既粒狀物同粉紅色既胸鰭，都係雄性異鱲於繁殖期既性徵。而且，我比較鐘意研究 cichlids，呢條應該唔似 cichlid。有錯請指證。

異鱲

形態曲成咁，似是身體有問題的...........。

咁呢條都算係'大曲背異鱲'嘞', 但我一直唔知異鱲個下顎會有齒狀物.

異鱲
http://www.hkwildlife.net/viewth ... &extra=page%3D1

The "saw like" structure is indeed a row of pearl organs which is a characteristic of many species of mature male cyprinids (including goldfish). This is a sexual characteristic probably has the function of attracting female / demonstrating male dominance.

This is definitely a cyprinid and is most likely Parazacco spilurus. Cichlids do not have pearl organ.

The curved shape is permanent? I think it was because the fish is swimming / turning and also due to the perpective from the angle of taking the photo...

I thought the deformed body was due to the refraction of image in the water.

No it's not, after all those years out there I think I can tell when I see one.

Oh! I'm sure you do.