From your description, squid is not a fish, but a decapod sepiidae animal. Squid is a mollusk in temperate, subtropical and tropical oceans. When it meets the enemy, it will spray ink to escape and leave with muddy sewage. There are pigment vesicles in its skin, which will change color and size with the change of mood. Squid grows in the open sea or at the junction of the bay and the open sea, and lives in an environment with hidden objects and a water depth of at least 20 meters, such as seaweed or rocks.
The cuttlefish is abundant from May to the end of August in the lunar calendar. At that time, the squid has grown up, and the number of large squid in the sea area will increase greatly, with an average body length of 5 to 8 inches, and some even as long as 20 inches.