Queries bout Molly - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 11 Old 03-18-2007, 10:12 AM Thread Starter
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Queries bout Molly

I've a few questions bout mollies...

1. How can one distinguish between the genders in mollies..

2. y do mollies keep injuring themselves...
i've had 6 mollies out of which 3 have injured themselves badly n 2 have died!
1 bashed itself to the wall and messed up her whole face...
2nd broke its tail (by the likes of it, as it could not move its tail and thus cudnt swim after being injured...also had a reddish patch at the lower end of the tail which makesme believe that it had hurt its tail.)
3rd has kinda broken its jaw(if they have one) its mouh is always open...no movement...its not having food since this morning but i only noticed its mouth just now in the evening while feeding them....

to help here is the stock of fishes n the tank dimensions...
4 mollies
4 dollars
3 angels
2 sucker fish

tank: 4*2*1 ft (approx 60 gallons)...
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post #2 of 11 Old 03-18-2007, 12:17 PM
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females have triangular anal fins and males have a pointier one. also if theyre sailfins im sure only the males have the "sailfin".

as far as why theyre injuring themselves i really dont know. your tank is certainly a good size and doesnt seem to be overstocked. i find that mollies are very active fish so possibly more likely to cause themselves injuries than others but certainly not to the extent that they bash themselves into the walls etc.

i hope you start to have better luck with them
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post #3 of 11 Old 03-18-2007, 12:27 PM Thread Starter
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hey thanx for the reply...
it would really be helpfull if someone posts a female and a male molly pic!
i wouldnt be able to compare 2 fins as triangular and pointier without having a reference pic i suppose!
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post #4 of 11 Old 03-18-2007, 12:38 PM
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i probably described it badly. in this first picture you can see a male and female together. the female is at the top. as you can see her anal fin is quite triangular. the male has a thinner pointier one but its not easy to see from this piture so on the other picture with just the one fish is a male and you can see his fin quite clearly there.

hope this helps.



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post #5 of 11 Old 03-18-2007, 01:08 PM Thread Starter
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OK so i guess all my mollies are females...do all males have sailfins as u said before?
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post #6 of 11 Old 03-18-2007, 01:38 PM
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no, not all do but im pretty sure that females never do. a sailfin molly is a type pf molly, just like a baloon molly is a type im sure
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post #7 of 11 Old 03-18-2007, 08:50 PM
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THere are about 5 species of Mollies. The ones that you find in the trade are almost all hybrids. The three most common strains are Polecilia sphenops, which is pure freshwater and does not have the sailfin (though some hybrids have a lyre tail), P. latipinna which des have the sail on the mails only (though compared to P. sphenops, the P latipinna females have a more sil like dorsal) and requires either brackish or very hard water, and P velifera which is very similar to P. latipinna but larger.

Insofar as I know, all the common livebearers (Mollies, Platies, Guppies, Swordtails, and mosquitofish) can be sexed easily by looking at the anal fin (and I believe the uncommon ones can as well). The female has a fin. The male has, to put it delicately, a male member. This is called the gonopodium, and is absolutely charateristic. Once you have that memorized, there is no other item you need to sex livebearers. That second picture ion Julie's post illustrates it perfectly.

Logic is only the beginning of wisdom
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post #8 of 11 Old 03-19-2007, 02:47 AM Thread Starter
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Hey thanx alot for that informing post!

I've got all female mollies by the looks of it...y are they still so agressive? do they really need a male partner to calm their estrogen levels (or wotever!!:P)

I dont have a planted tank yet so i'm a little worried if they again swim fast and bash into something...

I'm still posting my mollies pic..not really clear cuz my camera has lag n these r really scared of my cam i guess:P

ok..tried uploading the pics..but cudnt...plz help me with that too:P
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post #9 of 11 Old 03-19-2007, 12:37 PM
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upload picture, browse, then double click your picture, send, standard
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post #10 of 11 Old 03-19-2007, 10:17 PM
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all livebearing fish have a g-fin otherwise they couldn't be livebearers :P
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