標題: 星點伴麗魚 Hemichromis sp [打印本頁]
NickH 時間: 2010-1-1 22:10 標題: 星點伴麗魚 Hemichromis sp
[ 本帖最後由 NickH 於 2010-1-5 21:54 編輯 ]
AndrewL 時間: 2010-1-2 21:32
jasonpoon 時間: 2010-1-3 01:14
屬名 Hemichromis 如譯應為 "半麗魚屬"...
kaiserX 時間: 2010-1-3 17:14
NickH 時間: 2010-1-3 20:46 標題: 回覆 #4 kaiserX 的帖子
[ 本帖最後由 NickH 於 2010-1-3 20:55 編輯 ]
cfai 時間: 2010-1-3 20:53 標題: 回覆 #3 jasonpoon 的帖子
jasonpoon 時間: 2010-1-4 17:05 標題: 回覆 #1 NickH 的帖子
By the way, I think you have to differentiate Hemichromis stellifer from H. bimaculatus. How do you confirm your identification?
NickH 時間: 2010-1-4 20:53 標題: 回覆 #7 jasonpoon 的帖子
I found it from the Field Guide by AFCD. I did not know another species so alike.
I guess I have a homework to do now.
NickH 時間: 2010-1-4 21:28 標題: 回覆 #7 jasonpoon 的帖子
Based on the body color and the presence of the blue flecks, it seems to be more like Hemichromis stellifer than H. bimaculatus. In fact, another species, H. guttatus, is almost identical to H. stellifer.
jasonpoon 時間: 2010-1-5 10:33
原帖由 NickH 於 2010-1-4 21:28 發表
Based on the body color and the presence of the blue flecks, it seems to be more like Hemichromis stellifer than H. bimaculatus. In fact, another species, H. guttatus, is almost identical to H. stell ...
Base on the website's description and your photos above, the spot on the caudal peduncle is very marked. This characteristic is inclining to the identification of H. bimaculatus.
BTW, I have identified my photos of 2004 of a pair of breeding Hemichromis from Tai Tam, HK as H. bimaculatus due to the similar reason (as adult, the caudal spot is very visible).
In so far as the guttatus/stellifer/bimaculatus group are often confused, I also suspect that inter-breeding in aquarium has already taken place and that the fish available from the aquarium trade may already be hybrids.
NickH 時間: 2010-1-5 16:30 標題: 回覆 #10 jasonpoon 的帖子
According to the web site's info, "The true Hemichromis bimaculatus is a dark red-brown fish, it has very few irradescent spots on its flanks or gill covers and those that are visible are quite pale in colour."
And these features do not match with the ones in my photos.
I am not sure whether these are adults in my photos. There are many of them. Average size of 3-4cm. A couple larger ones of about 6cm.
I agree that these species are very confusing and actually same species from different sources may look very different. I think mis-identification is often in these species even in some books and web sites as mentioned by sydneycichlid.com.
Hybridism among these species is also possible. As the Hemichromis we found in HK are introduced species, they are very likely either released from aquarium or the offspring of those from the aquarium. This may explain why the appearance of these fish is different from the original species.
jasonpoon 時間: 2010-1-5 18:53
原帖由 NickH 於 2010-1-5 16:30 發表
According to the web site's info, "The true Hemichromis bimaculatus is a dark red-brown fish, it has very few irradescent spots on its flanks or gill covers and those that are visible are quite p ...
I checked that the variation on irridescent spot/markings could be even more than the spots, and that the body shape of the fish may give a better clue. Prudently, we better refer the local introduced breeding population in the meantime as Hemichromis sp.
NickH 時間: 2010-1-5 21:54 標題: 回覆 #12 jasonpoon 的帖子
Yes, perhaps Hemichromis sp is better when we are not sure.
Chris 時間: 2011-8-2 20:54
"Hemichromis lifalili have only 2 black spots on the flanks whereas
Hemichromis bimaculatus has 3, having an extra spot on the caudal peduncle."
"It can also be told apart from the similar red form of H. guttatus by comparing the midlateral markings of the two. In lifalli the marking is round and is situated above the lateral line. In guttatus the marking is oval in shape and some of it extends below the lateral line. "
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