glow squid spawn mush more than usual

after creating my world

i found about 7 or 8 glow squid at one place 

as you can see in the screenshot

and i never saw this amout of glow squid

at one place in previous snapshots/experimental snapshot

and i am sure i have read all about the snapshot at the minecraft page

and i did't saw anything there talks about glow squid spawning

seed:

8082958475863161342

XYZ:

397.629/74.57500/-13.664

it's kinda near the spawn of the world