Table 3.

Definitions of seahorse responses to flash treatments.

Category	Action	Description
Hunting efficiency
Action	Strike	Seahorse attempts to strike at prey.
	Catch	Seahorse catches and swallows prey.
	Success	Ratio of catches to strikes.
Spatial Use
Position	Zone 1	The first vertical quarter of the tank, closest to the strobe.
	Zone 2	The second vertical quarter of the tank relative to the strobe (Holdfast present in this zone).
	Zone 3	The third vertical quarter of the tank relative to the strobe (Holdfast present in this zone).
	Zone 4	The forth vertical quarter of the tank furthest away from the strobe.
Orientation	Towards	The seahorse faces in the direction of the strobe.
	Neutral	The seahorse faces towards the camera or away from camera, both eyes are visible (30 degree angle towards or away from camera).
	Away	The seahorse faces away from the strobe.
Activity
Rest	Inactive	The seahorse remains resting, without performing any kind of movement, while attached or unattached to the holdfast.
	Swinging	The seahorse remains attached to the holdfast, with slight movements of the head or body.
Active	Hunting	The seahorse swims or tilts the body, head or snout in the direction of prey. Attempted strikes at food irrespective of success.
	Swimming	The seahorse moves horizontally or vertically (through the water or across the bottom of the tank) with undulating pectoral and dorsal fins.
	Startled	The seahorse repeatedly and rapidly contracts and contorts the body, strikes or swims into the tank wall, displays sudden erratic movements.