如何分辨六間性別

[size=3]原文[url]http://www.cichlid-forum.com/articles/frontosa_sexing.php[/url]

翻譯自原作者Eric Glab

Sexing frontosa is typically difficult at best, even for the experts. I have seen exporters, importers, breeders and aquarists sex frontosa incorrectly. It's not that it can't be done, but it can be difficult.

There are several indicators that point to the sex of a frontosa. None of these points can be used until the fish are at least three inches, in my opinion.

1) Behavior- If one has ample time to observe a group of frontosa in a aquarium, there is a chance to sex the fish just on observation. This is especially true if the group had grown up together or at least has spent enough time in a particular aquarium to feel comfortable.

When a group of frontosa is grown up together in a group of six or more, it is almost guaranteed that the largest specimen is a male. Males generally grow larger then females and grow more quickly. A male must fight aggressively to become "king" of the harem. A larger fish has a better chance of being dominant thus the largest fish in a group is a male. If that male is removed from the group, a subdominant male will have a growth spurt and take his place.

Quite often a new hobbyist will believe that out of his group of frontosa, the largest is a male and the rest are females. While this may be the case, most likely it is not. Subdominant males may remain small because they have to in order to avoid the dominant male's wrath in the aquarium.

Males will also show aggression towards males and try to court females. You must watch carefully and patiently for a male frontosa to show his courting dance. It consists of the male listing to one side slightly while folding his fins. This may be followed by a slow sweeping circular motion over the substrate of the aquarium. It is a gentle gesture and is much harder to spot then many of the rift lake cichlids.

Often, sellers of frontosa groups have a more then optimistic idea of how many frontosas in a group are female. Buyer beware!

2) The nuchal hump- The hump on the head of the frontosa is actually an extension of the dorsal muscle. While there is no doubt that large older dominant males can have enormous humps, it is by no means a definite indicator of sex. I have seen females with large humps many would swear are males. I have also seen males that have a hardly any hump at all, many times there were subdominant males. All adult frontosas have a hump to some degree.

3) Venting or tubing- "Venting" or Tubing" actually involves viewing the sex organs of a fish in order to determine sex. This procedure is the most reliable method to sex frontosa, with practice. Larger specimens are easier to sex then smaller specimens. I personally have a hard time sexing a frontosa by venting, if under four inches. Frontosa that have already spawned are also easier to vent as it seems that when a female passes eggs her tube becomes larger.

In the photos below we can see pictures of confirmed male and female frontosa. There are two holes on each fish. The one towards the top is the anus. The one towards the bottom, closet to the anal fin, is the sex organ. You will notice that the female sex organ is more rounded and the male is more triangular. Trust me, it gets easier with practice.

Some individuals may be harder to sex then others. The male pictured below is a decent example but, I have seen others that were much easier to sex. The sex organ of the some other males I have vented were narrower and more triangular in shape.


分辨六間性別是最可能的典型的困難，即使對專家而言。
我看過出口商、進口商、飼養者和水族店老闆錯誤地分辨六間性別。
這不是不能做到的，只是很難做到。
有一些指標是分辨六間性別的重點。
我的看法是，這些特點不能被使用，直到魚至少有三吋大時。

1

行為-如果一個人有充份的時間在觀察水族缸中的一群六間，就有機會靠觀察力去分辨魚的性別。
如果這群體已在一起成長或至少有足夠的時間適應在特定的水族缸裡，這會是相當準確的。
當一個六間或更多的六間群一起成長，幾乎可以肯定最大的個體是雄性。
雄性通常長得比雌性大而且快。
雄性必需侵略地作戰到成為後宮中的王。
較大的魚有較好的機會去支配，正因如此一群魚中最大的就是雄性。
如果雄性從群體中被排除，第二順位的雄性將突然的成長且取代他的位置。
相當普遍的新的嗜好者會相信他來自的六間群体中，最大的是雄性，其他是雌性。
這可能是事實，也很有可能不是。
第二位的雄性可能剩下小隻的，因為在水族缸中，他們需要躲避統治者雄性的威脅。
雄性也向雄性展示侵略性並試著去向雌性求偶。
你必需謹慎地耐心地看雄性的六間展現他的求偶舞。
它是由雄魚稍微地展現出他的一邊一下又折疊他的鰭所組成。
這應會是在缸底順著慢慢繞圈圈的動作。
這是一個溫柔的艦作且比很多裂口湖的慈雕較難做出的。
六間群體的銷售者，在認為有多少的雌性在群體中時常過於樂觀。買家要小心!

2

頸部的隆肉-六間頭部的隆肉實際上是背部肌肉的延伸。
當較長老的支配者雄性會有巨大的隆肉是不用懷疑的，這對明確的性別指示是沒有意義的。
我看過有大隆肉的雌性長得像雄性。
我也看過雄魚幾乎一點隆肉也沒有，很多時候這些魚是次位的雄性。
所有的成年六間都有一點程度的隆肉。

3

排洩孔或管道-為了判斷性別，排洩孔或管實際上是去觀察魚的性器官。
實施這個程序是別辨六間性別最可靠的方法。
分辨較大個體的性別是比分辨較小個體還容易的。
如果在四吋以下，我獨自有一段困難的時期去分辨六間的排洩孔。
已經產卵的六間也較容易漏出孔就像當雌性排卵在他的管道中會變得較大。
在下列的圖可看到被証實的雄性及雌性。
每隻魚有兩個洞。其中一個在上面的是肛門。
在下面的那個，接近尾鰭的是性器官。
你要注意雌性的性器官是較圓的，雄性則偏三角形。
相信我，這比較容易去實行。
有一些個體可能比其他隻較難去辨別。
下列的雄性圖是一個正常的例子，但我看過其他是更好判斷性別的。
其他雄魚的性器官，我看過較狹窄且較呈三角形的。[/size]

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雄魚

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雌魚

回复 #1 vergil666 的帖子

谢谢分享，
跟分辨非洲鱼雄雌的方式有点一样

好详细的文章，谢谢分享。

回复 #2 kaye 的帖子

老實說我拿我的8只較大的六間來看﹐真的很難看的出來:blur

中了六间毒了，喜欢

回复 5# 的帖子

能分享你的六间的照片吗？