PlanetCatfish.com

I have a batch of albino BN fry in my tank, this group has me confused, I notice 2 distinct sizes of fish, small and extra small...is this a male/female difference? The smaller ones also seem a little more white/clearer than the large ones. As I sit here writing this.....I have a second female in that tank that I thought was not large enough yet to spawn.....and I never saw eggs in the cave......so I can't imagine that she snuck in and laid a group that I never saw since I check it with a flashlight all the time........so I am still thinking these are from the same batch and it might be a male/female size difference...which I did not see on the first batch I had 2+ months ago.

I would hazard a guess that you see the difference between males and females, yes. It's hard to say for sure, of course. But in my first batches, I sometimes picked out the larger ones to give away, and almost always, it turned out that large ones were male...

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Mats

Hey Mats; I looked at the link to your aquarium photos, and your shot of "Warren's face" looks like the closest photo to the 5-6 brown BN I have in a tank that I can't identify. What is he? I was thinking my fish are either "Orange-spot" or maybe Red-Spot. I am trying to get some decent photos to post.

There is a size difference with all spawns (likely male/female) but BN will spawn with eggs or fry in the same pot. My 3 brown females lay eggs on the same day, but my albinos looked like they were going to spawn about 10 days apart (till one female died)

I have a spawn of albino BN that look like 2 different ages, but I know they are not. If you get more than about 40 for the first spawn I would guess there was more than 1 female involved.

I have noticed this too. But have never noticed any difference in the male/female ratio between the slow and fast growers. Have the same problem in every other species of fish I raise. Usually the big ones are just the most competative when it comes to food, being stronger they simply eat more, quicker and leave the smaller ones with scraps. It can usually be remedied by putting the slow growers in a tank of their own where there is less competition, or by removing the large ones.