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Poecilia latipinna optimum salinity
June 26, 2013
8:06 am
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ckraft
So. California
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wondering about the best salinity to keep the fish.  I ran onto a paper at:

http://evols.library.manoa.haw.....sequence=1

 

that would indicate 10% salinity is best.  My question - does this mean 10% of the salinity of average seawater, or is there some other meaning.  Is there any best ratio for sodium and potassium ions?  I have been keeping my fish in very hard water, 1000 tds, 55dGH.  Mostly calcium and magnesium, some sodium, I haven't tested for potassium.

 

Thanks

charles

June 26, 2013
11:15 am
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oaken
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I think you are reading the article wrong. The numbers in the article are in permille (parts per thousand) and not percent. The abstract states that optimum salinity for breeding is 25 ppt and for rearing fry 10 ppt. So 25 ppt and 10 ppt is the measurement of the salinity of the water. As an example people who have reef aquariums usually have a salinity of around 35 ppt. 

June 26, 2013
11:28 am
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Matt
Málaga, Spain
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I wouldn't have thought there would be a precise optimum since the species is euryhaline (able to adapt to different salinities). Perhaps the fry move into less brackish nursery zones to grow and avoid unnecessary physiological stress hence the differences quoted in the paper for adults and juveniles?

Cake or death?
June 26, 2013
6:04 pm
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ckraft
So. California
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March 3, 2013
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oaken said
I think you are reading the article wrong. The numbers in the article are in permille (parts per thousand) and not percent. The abstract states that optimum salinity for breeding is 25 ppt and for rearing fry 10 ppt. So 25 ppt and 10 ppt is the measurement of the salinity of the water. As an example people who have reef aquariums usually have a salinity of around 35 ppt. 

Yes, you are right.  I was reading it wrong.  Thanks for the response. 

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