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標題: 曲背異鱲 [打印本頁]

作者: kingarthur    時間: 2010-10-19 15:07     標題: 曲背異鱲

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 ]

圖片: DSCF7581s.jpg (2010-10-19 15:07, 60.87 K) / 該附件被下載次數 17
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作者: AndrewL    時間: 2010-10-19 15:55

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.
作者: rosara    時間: 2010-10-19 16:33

異鱲 Predaceous Chub
Male

[ 本帖最後由 rosara 於 2010-10-19 17:03 編輯 ]
作者: 獵隼    時間: 2010-10-19 19:24     標題: 回覆 #1 kingarthur 的帖子

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。
作者: AndrewL    時間: 2010-10-19 21:14     標題: 回覆 #3 rosara 的帖子

you sure this was 異鱲 ?
作者: AndrewL    時間: 2010-10-19 21:27     標題: 回覆 #4 獵隼 的帖子

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?
作者: rosara    時間: 2010-10-19 21:38



QUOTE:
原帖由 AndrewL 於 2010-10-19 21:14 發表
you sure this was 異鱲 ?

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。
作者: Chris    時間: 2010-10-19 22:19     標題: 回覆 #1 kingarthur 的帖子

異鱲
作者: 獵隼    時間: 2010-10-19 23:42     標題: 回覆 #1 kingarthur 的帖子

形態曲成咁,似是身體有問題的...........。
作者: kingarthur    時間: 2010-10-20 00:03     標題: 回覆 #9 獵隼 的帖子

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.
作者: 獵隼    時間: 2010-10-20 00:18     標題: 回覆 #10 kingarthur 的帖子

異鱲
http://www.hkwildlife.net/viewth ... &extra=page%3D1
作者: jasonpoon    時間: 2010-10-20 10:40     標題: 回覆 #1 kingarthur 的帖子

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.
作者: jasonpoon    時間: 2010-10-20 10:41     標題: 回覆 #7 rosara 的帖子

This is definitely a cyprinid and is most likely Parazacco spilurus. Cichlids do not have pearl organ.
作者: jasonpoon    時間: 2010-10-20 10:45     標題: 回覆 #10 kingarthur 的帖子

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...
作者: rosara    時間: 2010-10-20 11:25



QUOTE:
原帖由 jasonpoon 於 2010-10-20 10:45 發表
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.
作者: kingarthur    時間: 2010-10-20 13:22     標題: 回覆 #15 rosara 的帖子

No it's not, after all those years out there I think I can tell when I see one.
作者: rosara    時間: 2010-10-20 17:13



QUOTE:
原帖由 kingarthur 於 2010-10-20 13:22 發表
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.




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