I agree that they will tolerate wildly varying salinities almost instantly
and it is only over a few months that you notice the falloff in vigour,
fertility etc if kept too "dilute". If you bring them up to full marine for
a few weeks then they seem to recharge their batteries and will be right for
a few more months again.
This is a fish that spends 80% of their time in the top 3 inches of the
aquarium so don't keep them below eye-level or you'll never see them
Regards,
Bruce.
Bruce Hansen, A.N.G.F.A., Advancing Australian Aquatics.
Bruce Hansen, ANGFA, caring for our aquatic ecosystems.
Please visit us at http://www.ozemail.com.au/~fisher/angfa.htm
-----Original Message-----
From: Mach T. Fukada <fukada at hawaii.edu>
To: rainbowfish at pcug.org.au <rainbowfish at pcug.org.au>
Date: Friday, 4 December 1998 9:46
Subject: Re: [RML] Re: Gobies; P. cyanodorsalis
>At 12:39 PM 12/3/98 -1000, you wrote:
>Been fooling around with these guys and I have some of them in 20 gallon
>tub, with 1 tsp salt per gallon (same as I use to raise Nothobranchius).
>They seem to be OK, however there is a generous portion of crushed coral in
>the tank to boost the hardness, buffering and pH. I do think that they
>fairly susceptable to radical changes in pH, rather than changes in
>salinity as I can usually aclimatize these fish down to 1 tsp salt per
>gallon over the course of one afternoon. I have noticed that the eggs seem
>to be more willing to hatch in water with less salinity.
>
>Got a question for Dave Wilson who wrote:
>> The P.cyanodorsalis that live in Darwin harbour are in full marine >water
>for 8 or 9 months of the year and brackish to fresh during the >wet season
>depending on the amount of rain that is falling.
>
>Do you notice there are more fry in the streams during the wet season? I
>have noticed that the eggs seem to all most go dormant until there is a
>change in water movement or drop in salinity.
>