Hyposalinity with mantis in tank..

[Georgeoz]

Im currently lowering the salinity in my tank, and will achieve hypo around tomorrow afternoon.
There is either a mantis or pistiol shrimp which inhabits the tank, and im wondering whether this little guy will survive or not?
Can someone tell me if these they can handle hyposalinity (1010) for about 4 weeks?

 

[Gonodactylus]

Georgeoz,

I just work on stomatopods and don't get into aquarium keeping - beyond what is necessary to keep them alive. However, I have done some research on salinity tolerence, so perhaps I can offer some help.

First, we need to get some measurements right. Normal seawater at 25 C is somewhere arournd 1.o23. I'm not familiar with the scale you are using, but I'm guessing that you are talking about seawater that is 1.o10, or roughly 50% the concertration of normal at 25 C.

Next, we need to know what species you are working with. Intertidal gonodactylids are fairly tolerant of hyposalinity. Subtidal species are not. Furthermore, there are some squillids and lysiodquillids that occur at times in brackish water. They clearly could handlle this.

Let's assume that you have a reef flat gonodactylid like Gonodactylus chiragra or Gonodactylaceus graphurus. If they survive the intital drop in salinity which hopefully occurred over a day or two, they can probably go days to a few weeks at 50% A month is pushing it., but I have seen animals survive for this long. If the animals are subtidal, non-coastal, I wouldn't give them more than a couple of days.

Roy

 

[Georgeoz]

Thank you for your imput roy.

The measurments are indeed the ones your thinking of, 1.010.
As to the species, i am unsure as to exactly what it is, but given your response, i imagine that i will find out in time.... lol

thanks again