Many thanks for the information. So basically they would get out of there at approx. +17ppt if they could, only they are trapped because the way upriver is blocked? Does the road function as a dam or something?
Sharks and rainbows together, wow, that would be a sight.. (Don't try this at home, kids!)
Cheers,
Christophe
r_m_l at yahoogroups.com schrieb am 25.11.05 17:42:01:
Hello Christophe,
The M.australis in the half strength seawater appear to be caught there
after the wet season. The whole Blackmore River becomes fresh then after
the wet season flow subsides, the lower part blocked off by the Old Bynoe Rd
gradually becomes more salty as the dry season progresses. The Red Tails
there hang on until the salinity gets to 17ppt then they disappear after
that. I assume that 17ppt or slightly more salty is their upper salt
tolerance. The tidal part of the river is almost full seawater strength by
the time the wet season starts again. The rains are coming soon and the
river will once again be fresh.
The Blackmore River is one place where you can see sharks and rainbowfish
swimming together. Juvenile Bull Sharks regularly frequent the upper part
of the tidal influence. You can see a picture of a bull shark in the ANGFA
database gallery. The photo was taken in the Territory Wildlife Park
Aquarium. Australia's largest freshwater public aquarium.
http://db.angfa.org.au/
Cheers
Dave
On 25/11/05 9:33 PM, "Christophe Mailliet" <christophe.mailliet at web.de>
wrote:
>
> for some reason my first post did not show up? second try.. C
>
> "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
>>
>>
>>
>> ----------------------
>> Mar sin leibh an-dr`sda,
>>
>> Cym a' Gh`idhlig Ber!
>>
>> Researching . . .
>> Surnames: Kelly, M'Glone/M'Gloin, Duff, Mulligan,
>> Butler, Hammil, M'Gown/M'Gowan, Mulholland, Caldwell, Osman
>> Countries: Ireland (Co. Tyrone, Leitrim, Armagh,
>> Down) Scotland (Linlithgow, Bo'ness, Glasgow)
>>
>> Canada is a country whose main exports are hockey
>> players and cold fronts. Our main imports are
>> baseball players and acid rain. ~ Pierre Trudeau,
>> former Canadian prime minister
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
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