[Dracus]

By 150 turns I run about 200-220 ships total
6 pop transports, 4 troop transports, about 30 ships of odd designs and the rest are from capture or trading with allies.
Since I never scrap any ships, I get some very old designs running around. Captuered ships that I can not repair, I use as ram ships for finding mine fields. Older ships either are used as scout ships or stationed to prevent rioting on captured planets.
The AI's run about 150 ships themselves in my games. I tend to see fleets of 75 or more ships.
In my current game, there are 200 systems, 10 Ai's and me. We all have large fleets of ships made up of ships we have traded or captured from each other.