The electromagnetic pulses are emitted as a highly concentrated ring-shape of green-colored electricity. The Prawn Suit is particularly susceptible to Crabsquid attacks as it is the only vehicle that cannot turn off its lights. Crabsquids also will physically attack light sources (such as vehicles and seabases) by slashing them with their legs. These factors makes it ill-advised to build near an area inhabited by Crabsquids or leave vehicles near Crabsquids. If light is shone at a Crabsquid they will retaliate with an EMP blast, temporarily disabling electronics, vehicles and Seabase power.

However, using a vehicle's light will usually end up with the Crabsquid disabling it. Similar to the Boneshark, the Crabsquid is attracted to light and will follow certain light sources, meaning that it can be distracted using lights from the Cyclops, Seamoth, Prawn Suit, Seaglide, Flashlight or Flares. It can also be observed catching and eating smaller fauna, and attacking Warpers. Upon being approached, the creature will launch an attack, dealing 40 damage to the player. The Crabsquid swims by continuously inflating and deflating its transparent membrane, allowing for sudden bursts of movement, however it can also walk around on the seabed using its two sets of four legs. The two shortest limbs near its mouth form a pair of comparably small pincers of which it uses to attack by raising its legs. Its ten limbs are brown-colored and smooth. The Crabsquid's legs resemble those of a horseshoe crab, though tipped with small fins. The Crabsquid's head consists of four, large blue eyes with black pupils and an oddly shaped mandible below them. The Crabsquid's main body has two layers: a translucent, bulbous sac resembling a comb jellyfish's body, and a hard brown green body within, similar to that of a real life squid's mantle.

Cyclops locations subnautica