Table 1.

Cage specifications of the three tested cages

Cage	L × W × H (cm)	Volume (cm3)	Original DRS (cm2)	Increased DRS (cm2)	Final DRS (cm2)
Big cage A	90 × 30 × 30	81,000	7200	3600a	10,800
Big cage B-1	90 × 30 × 50	135,000	12,000	6000b	18,000
Big cage B-2	90 × 50 × 30	135,000	8400	9600c	18,000

^aAdded two pieces of (15 × 60 cm) nets inside the cage to increase the DRS

^bAdded two pieces of (25 × 60 cm) nets inside the cage to increase the DRS

^cAdded four pieces of (20 × 60 cm) nets inside the cage to increase the DRS

Abbreviations: L length, W width, H height, DRS density-resting surface