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[quote=”Stefanie” post=2133]Encouraged by the threads on young paros, their possible age and sex, here and here in our forum, I opened a thread at the IGL-forum, concerning ageing and sexual differentiation/determination in young paros.
My questions – which I now would like to present to the whole paro community – were as follows:
1. Is it possible to estimate the age (or better: date of hatching) of young paros by taking the size as basis? How high or low is their growth rate in the first weeks of their life? Are there differences in the various species and forms?
2. The second, much more comprehensive question is about the determination of the gender in fishes. I heard that there is no chromosomal fixing of the sexes during fertilization, but that the gender evolves in the first few weeks after hatching. Is this true? And – concerning paros – at which age or within what time frame will the gender be fixed? Are all young paros male-coloured and dismiss this colouration when becoming female?
These were the questions I asked. Richard Brode gave a very interesting and exhausting answer and agreed to post it here in our forum, too – if we give him a little time.[/quote]
If this was answered could you please post a link here?
If it was not and if this problem occures within the Paro populations too, I can give several information about methods that are used to influence gender ratios within the aquarium killifish populations where getting close to only one gender is very often. (and are prolly functioning this way in the nature). I think its very likely that could work the same way for Paros and could improve intensive breeding methods to certain degree.
Thanks for getting this straight for me Helen and Peter. I was not realy buing them becouse they were marked as gunawani luckily, I was looking for something new and interesting for me and there for I bought the fish becouse they were just Paros. So no problem for me that they are not P. gunawani. I discovered new super interesting and important field of aquaristics thanks to these fish and I was looking for some info on them and discovered parosphromenus-project.
the czech importer told me that they were collected by somy hobby people from the export company that collect fish for themself and have put some of them to their company commercial trade and that he asked for location (I think that would help some, may be a lot) I need to take better picture of them, there is a male that starts to show some colors on the fins. Even if they are not gunawani, I realy like them and would like to obtain some more species soon. 🙂 Will give them a chance to settle down and we will see. Will def post the info on the location if I get some.
[url=http://postimg.org/image/u0yshkdkt/]
here is the least worthless picture. Combination of bad camera and dirty glass of the tank. Sorry for that, the tank is very old and has limestone on it as I made my small tanks some time ago by cutting some old tanks from my childhood when I was breeding Tanganican cichlids and I was not able to clean it using whatever stuff. They are quite cheeky and are serching the tank for food since I woke up. Only gave them artemia so far and they are eagerly feeding on it.Congrats on P. ornaticauda fry. I think every parametr as such is usually overrated. The problem is that there usually is some equilibrium of parameters needed for the eggs to develop and the larvae to survive and in most of the cases there will be multiple equilibria with some of the parameters involved that we prolly dont even know about.
Thank you very much :)Ihad just released them in to the tank and they immediately started to descover it.Seems like they like their new home and they are apparently hungry.It was quite visible they were feeling better and better as I was slowly mixing the water from the bag. I was told in the shop that they softened the water they were kept in, but it was still liquid dolomite. I cant wait to see how they will look tomorrow and what species they really are.
So I have nine fish finaly. Some were hiding in the plants. Condition looks promissing, they even said that they have mixed some softer water for them. Def they were not starving there, so far good news. Totaly no coloration showing besides the body stripes and some brown spots over the body which seems to be stress coloration. I still did not get home so will be introducing them in to the tank within like 2-3 hours. I am glad I did not have small tank and had to prepare some 30+ liters one. Did not expect so many fish, but I am glad as it always means better chances of obtaining some fish that will be able to reproduce. Wish me luck.
I hope its not going to be that bad, its one of the best shops in the country and the owner seems to know what he is doing. Fingers crossed. I normaly never buy fish from shops, or have not done so for years, always bought straight from importers so I have quite a lot of experience with south american black water imports. Will check the water from the shop and make it work somehow. Dropping method always works fine 🙂
Hi,
been on the site almost straight since I registered and studying. I am supposed to pick up my fish today that were imported as P. gunawani and should be six of them (they are not sure in the shop, there are plants in the tank and the fish are hiding). The original import was 10 fish. Of course I am scared about their condition and very curious if its really P.gunawani, I went through the pictures so hopefuly I am able to tell if they at least look pretty close like it. Will buy what they have to safe the fish from shop anyways and give them my best try. Tank is already set up, I even had plenty of pretty suitable water stable and prepared for my Laimosemion xiphidius so I used that with pH 5,5 as I dont know what scary water parameters they are capt in untill now. I will see in like 9 hours. Will drop the pH slowly more than. Of course I will try to make some pictures for you guys as soon as they settle and show up a little. I just hope they make it.
[quote=”Davy” post=3304]Hello Bernd,
This method works fine but I need to change to peat on background after few weeks because the pH increase.
I think to buy Kati Ani next month. The water on exit of it has a pH between 3,5 and 5. With my corner bubble filters with peat on it I can have pH between 3 and 4.[/quote]
Some peat stuff from killibreader. If you need to get very low pH levels and have it stable. Do not relate on substrate, prepare the water.Do not use aquarium peats as they seem to be processed to not be that acidic. Try to buy some unprocessed peat for gardening purposes, just make sure it does not contain any fertilizers or other aditives. Its like 10x cheaper and you can use the peat granules as a substrate for much longer, they still look ok. You need to make sure the peat is acidic kind of peat (fast check: wet the peat and put a little NaHCO3 (baking soda) on it, if it start to foam it is acidic or just leave it in RO water for day or two and check for parameters. Try different peats and find what works best. To condition the water put the peat in to some bucket and use strong aeration. This will help to dossociate the humic and fulvic acids molekules and you will get lower pH levels faster. The water you get this way will be very stable in pH for a long time. I use alder cone extract, ketapang extract and oak bark extract too ( prepared the same way, do not boil it just use small 5 litre barrels from mineral water for example and strong aeration, leave it alone for couple days) to prepare simmilar type of water. the dosage of extracts is of course dependent on quality of ingredients and how strong you make it. Learning to use it takes some time, but it will pay off. You need well fermented stuff when you are going to prepare ketapang and alder cone extracts, do not use green leaves, buy some good ones. When collecting the alder cones, find some non poluted locality and go for cones that already fell from the trees and are not washed out by rain. Hope that helps
