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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 ]

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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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