Common gudgeon offspring

Today, I've harvested most of the fish of my swimming pool in our backyard. The common gudgeon (Gobio gobio) has reproduced well in there this year. I haven't harvest them al for daylight was already dimming. And it cooled down pretty fast after seven.
The sizes of this years offspring differ a lot. I'll try to get them all out of the pool by tomorrow afternoon when I get back from the hospital.