I've searched the net to try and find more specific information as to
when the goldfish breeding season is to no avail. All I can find is
that it starts in Spring and continues through the Summer, but does
anyone have any more specific info as to which MONTHS this relates
to? Also, would the season be a slightly different time of the year
in the UK compared to warmer countries such as the States?

I am aware that fish kept in acquariums don't entirely follow the
natural spawning patterns of fish kept in ponds or those in the wild
because tank temperatures tend to be pretty consistent all year round
and don't undergo the same seasonal temperature fluctuations, but I
am guessing there is still some kind of a mating season.

I have been having problems with one of my Black
Moors (Romilly) who is being aggressive towards my other Black Moor
(Gladstone). I'm sure that it is 'breeding' related as he only
started acting this way once their tubercles appeared. At the moment they are separated by a divider.

I am eager to find out when I can expect this aggressive behaviour to
diminish (if I am right that it is related)?

Can anyone help?

Youare right - fish kept in an artificially heated/lighted tank will have more unusual spawning times. In nature ( ) the fish would have a "dormant" period - in the winter when it is cold. Being coldblooded, the fish slow down and do not eat or move much at all.

When the water warms up in the spring, the longer days, warmer water and spring storms that bring low air pressure will stimulate the fish to spawn. Many will continue spawning most of the summer and fall, until, once again the temps drop.

The constant supply of protien (insects on the water surface) will also encourage the fish to continue spawning.

If you wish to limit the activity, you can keep your tank a more even temperature (risking egg binding in some females). You can change smaller amounts of water more often - for large water changes will often encourage spawning. You can house only males with males and females with females. You can feed a more carbohydrate rich diet - limiting the protiens.

This does not mean that you will NOT get breeding behavior, but it may be more limited. At any time, if a female goes for too long without releasing eggs, she can have problems - from bacterial infections to floating, etc. It is really best if she is allowed to drop her eggs at least a couple of times a summer.

I have one female who has had 4 different spawnings for me already this year - she gave me about 200 eggs the first time and over 1000 each other time. She looks gravid and ready to drop again in about 2 weeks!!! The males breeding starts are raised and bright and they will most likely remain so until November or so here in Illinois. I do not heat my adult tanks - they stay at room temps year round - dropping to 62F in the winter nights and 68F in the days. In the summer, they go to 78-80F in the days and 75-76 at night.

Some fish actively "chase" even if they are both males or both females - showing breeding behavior that is not productive. This can go on the entire season, too. A dividor may be the best thing you can do for this season.....

Oh dear, it doesn't look good, does it?

I just hope that a few weeks of separation will calm Romilly down somewhat. Or, that Gladstone will have grown substantially in those few weeks that he is able to stick up for himself more.

Other than that, all I can think to do is perhaps add a third Black Moor in the hope that Romilly will have more distraction and pick on Gladstone less or to permanently separate them into two different tanks.

my fish are in spawning time now what u can try is get something quite warm and lay it on the side of your tank
or stand it up on the tank