The Migrant Fleet

Mass Effect 2 Solar System Entry
A fleet of 50,000 craft holding over 17 million quarians, the Migrant Fleet is the largest array of spacefaring vessels in the known galaxy. Though quarians on Pilgrimage have visited most settled worlds in the galaxy, few outsiders have ever stepped foot inside the quarians' ships.

Mass Effect 3 Solar System Entry
A fleet of 50,000 craft holding over 17 million quarians, the Migrant Fleet is the largest array of spacefaring vessels in the known galaxy. It is a testament to the quarians' strategic skill that these numbers have not dropped significantly during recent battles. The fleet is now on the far side of the star from Rannoch, the better to cloak its movement from the geth.

Mass Effect 2 Codex Entry
The flotilla, or the Migrant Fleet, is a fleet of roughly 50,000 starships that houses over 17 million quarians. The largest collection of starfaring vessels in the galaxy, the Fleet is so large it may take days for all the ships to pass through a mass relay.

The ships are constantly repaired, replaced, and upgraded to comfortably house as many quarians as possible. Typically, ships specialize in roles for the Fleet, from the enormous agricultural liveships to the shielded lab ships to the repurposed freighters known as homeships that house quarian children, young parents, and educators. Employed quarians typically live in the ship they work on, since commuting from ship to ship ties up resources with unnecessary docking procedures.

Even within the flotilla, quarians on most ships will remain encased in their protective suits. Rarely, quarians will meet on "clean ships" for specific purposes such as medical services or reproduction. When this occurs, they remove their suits, knowing full well that it is likely that they will spend a few days having allergic reactions or getting over infections as their weakened immune systems compensate for each other's presence.

Mass Effect 3 Codex Entry
The flotilla, or the Migrant Fleet, is a fleet of roughly 50,000 starships that houses over 17 million quarians. The largest collection of starfaring vessels in the galaxy, the fleet is so large it may take days for all the ships to pass through a mass relay.

The ships are constantly repaired, replaced, and upgraded to comfortably house as many quarians as possible. Typically, ships specialize in roles for the Fleet, from the enormous agricultural liveships to the shielded lab ships to the repurposed freighters known as homeships that house quarian children, young parents, and educators. Employed quarians typically live in the ship they work on, since commuting from ship to ship ties up resources with unnecessary docking procedures.

Even within the flotilla, quarians on most ships will remain encased in their protective suits. Rarely, quarians will meet on "clean ships" for specific purposes such as medical services or reproduction. When this occurs, they remove their suits, knowing full well that it is likely that they will spend a few days having allergic reactions or getting over infections as their weakened immune systems compensate for each other's presence.