Misidentified species: what if I put a freshwater Violet Goby in brackish water?

Carol Hayden

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I decided to get a Violet Goby. However, I found mention that the Gobioides peruanus looks almost identical.




^Both official pictures of Gobioides peruanus

Fishprofiles.com, , says that the so-called broussonnetiI imported to the UK are usually actually peruanus, and that its freshwater. However, various official entries for this fish say that it lives in rivers with "brackish influences".

Now I don't know what to do. What if I get a Violet Goby and start raising the salinity of the tank and it turns out it's a peruanus? How much can it tolerate? What symptoms will a freshwater fish show when the salinity is too high?
 

maggie thecat

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That source that mentions the difference says the fish are much of a muchness with the exception of the UK traded one not liking FULL MARINE SALINITY.

So don't raise your salinity over 1.025 (seawater strength). Keep it on the lower end of the scale 1.005 to 1.008 which is their preferred range and you should be fine.

Neat fish BTW. I wish I had room for a tank that size.

Welcome! There aren't many brackish keepers, so the more the merrier.
 

Aquarist

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Hello and Welcome to Fish Lore!

I hope you enjoy the forum.

Ken
 

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