Re: [RML] P. cyanodorsalis revisited

Bruce Hansen (bhansen at
Tue, 26 Jan 1999 20:54:03 +1000

G'day Mach

The shots I've seen of the Crab Ck fish had shorter fins - for the size of
the body. As you have so correctly stated goitre is often due to lack of
Iodine. TB is only an occasional cause.

I have never heard of any genetic interchange between P. cyano and
P.inconspicuus. So far incomspicuus has proved difficult to maintain in
aquaria for more than a few weeks. The last lot I had were loaded with
parasites and were impossible to fatten. next time I'll clean them out with
Ivermectin early. Perhaps this year when I'm up there I'll try them again


Bruce Hansen, A.N.G.F.A., Advancing Australian Aquatics.

Bruce Hansen, ANGFA, caring for our aquatic ecosystems.

Please visit us at

-----Original Message-----
From: Mach T. Fukada <fukada at>
To: rainbowfish at <rainbowfish at>
Date: Tuesday, 26 January 1999 11:08
Subject: Re: [RML] P. cyanodorsalis revisited

>Hi Bruce,
> I have been noticing that there seems to be a fair ammount of variability
>within a spawn. It appears that some fry have longer fins (dorsal and
>anal) some shorter fins. I haven't really measured frequency of these
>traits as might be environmental, submissive/dominant related, etc. Do you
>know if the P. inconspicous inter-breeds? Maybe naturaly ocuring
>intermediates betweenthe two species? I have also been noticing goiters
>developing on what apepars to be the dominant male in the group. Know if
>any one has done work on this area? I did get them tested for TB and so
>far it is not the causal agent. I did recall reading that this problem
>ocurred in brackish water killifish raised in salt water mixed from rock
>salt rather than a seawater mix. The addition of iodine cleared up the
>problem. I need to get an iodine test kit. Any ideas?