Table 2 Outline of the survey

Depth (m)

143 - 144

1,045 – 1,050

652 - 757

305 - 498

561 – 566

Location (lat.)

N 144°40.5′

N 144°39.0′

N 144°54.0′

N 144°51.0′

N 144°37.2′

Location (long.)

E 144°11.5′

E 144°20.0′

E 144°26.4′

E 144°24.0′

E 144°17.0′

Cruising speed (m/s)

0.12

0.12

0.12

0.12

0.12

Cruising height (m)

2.1

2.5

2.5

2.5

2.5

Route type

Grid

Grid

Straight

Straight

Straight

Duration (h)

4.0

6.0

4.8

6.4

3.3

Observation area (m²)

340

2,600

3,400

5,500

440

Photography number

158

1,593

1,310

2,077

159

Number of kichiji

0

2

23

2

10

Density of kichiji (/ha)

0

0

68

4

227