"Christophe Mailliet" <Christophe.Mailliet at web.de> schrieb am 25.11.05 11:32:52:
Hi All,
Melanotaenia splendida splendida (Peters, 1866) has been found in water with 28 g/l of salt and Melanotaenia splendida inornata (Castelnau, 1875) in brackish areas with 18 g/l of salt, as written by Ray Leggett in Fishes of Sahul (Leggett, R. 1996. Salted rainbows, the perfect hors-d'oeuvre. Fishes of Sahul, 10(1): 443-444).
All Thelmatherinidae are strictly freshwater. Two Bedotiidae have been found in brackish swamps (Bedotia longianalis) and mangrove-lined creeks (Bedotia sp. "Maroantsetra") but it is presumably not their normal habitat. It appears that B. madagascariensis has sometimes been found in the Canal des Pangalanes, which is a man-made channel following the East Coast of Madagascar, sometimes as close as 40 m to the ocean and only separated by sandy banks where ocean water sifts through. Water in the Pangalanes is also very slightly brackish (under 10g/l salt).
Some people still add a little salt to their rainbow tanks to prevent bacterial and parasitical infections (one tablespoon per 50l or so) but it appears it is more "voodoo" ;-) than anything else, as this salt concentration is probably too marginal to have any effect. So you might as well not do it.
I think it is safe to assume that brackish environments are not the preferred habitat of those species that have been found there, but I could be wrong. Dave, do the M. australis live permanently in the intertidal zone, or is it just temporary (maybe looking for food)?
Cheers,
Christophe
r_m_l at yahoogroups.com schrieb am 25.11.05 05:29:49:
Hello Eileen
I live among some interesting Rainbows.
On the Blackmore River in the last of the tidal influence before fresh water
there are local red tails, Melanotaenia australis that have been located in
water up to 17 ppt salt. Two Blue-eyes here are marine. Pseudomugil
cyanodorsalis and Pseudomugil inconspicuus.
Dave in Darwin
On 25/11/05 2:44 AM, "Eileen Kortright" <eileen at spamcop.net> wrote:
> Still pouring through all the information on
> Glossolepis pseudoincisus that everyone posted.
> MUCH thanks! Looks like I'll have a mini-red tank for Christmas :)
>
> It seems that every time I suggest to someone in
> our aquaria forums (AquariaCentral.com) that they
> look at rainbow fish, a member will post a
> message stating that rainbows are brackish.
> Doesn't seem to matter *which* rainbow I suggest,
> they are all "brackish". The other day someone
> tried to tell us that the entire Pseudomugilnae sub-family were brackish.
>
> I've done some quick searching and produced
> Melanotaenia nigrans -- that listing only said
> that salt was optional -- and Telmatherina
> ladigesi of the Pseudomugilnae needed salt.
>
> So, my two questions are
>
> 1. Are there any *true* brackish rainbows? Is
> Telmatherina ladigesi a true brackish fish?
> 2. Does anyone have a list of the "salt recommended" rainbows?
>
> Much thanks,
> Eileen Kortright
>
>
>
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