Table 3.
Sightings and numbers of gray whales recorded on- and off-transect during aerial surveys off northeast Sakhalin Island, 5 June–2 December 2003
| Survey period | Piltun | Offshore | Extensive | Lunskoye | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km | On | Off | km | On | Off | km | On | Off | km | On | Off | km | On | Off | |
| 5–7 June | 898 | 0/0 | 0/0 | 593 | 3/3 | 1/1 | 0 | NS | NS | 582 | 0/0 | 0/0 | 2073 | 3/3 | 1/1 |
| 5–15 July | 1245 | 42/61 | 18/29 | 727 | 7/14 | 3/9 | 10319 | 8/10 | 1/1 | 493 | 0/0 | 0/0 | 12784 | 57/85 | 18/29 |
| 18–20 August | 1067 | 61/87 | 17/20 | 480 | 3/6 | 2/4 | 0 | NS | NS | 579 | 0/0 | 0/0 | 2125 | 64/93 | 19/24 |
| 18–22 September | 1468 | 87/113 | 28/46 | 703 | 7/11 | 5/8 | 14510 | 3/4 | 7/11 | 580 | 0/0 | 0/0 | 17260 | 97/128 | 40/65 |
| 21–28 October | 897 | 34/45 | 0/0 | 471 | 0/0 | 0/0 | 0 | NS | NS | 578 | 0/0 | 0/0 | 1947 | 34/45 | 0/0 |
| 29 November–2 December | 269 | 1/1 | 0/0 | 398 | 2/3 | 0/0 | 0 | NS | NS | 381 | 0/0 | 0/0 | 1048 | 3/4 | 0/0 |
| Total | 5844 | 225/307 | 59/85 | 3372 | 22/37 | 11/22 | 24830 | 11/14 | 8/12 | 3192 | 0/0 | 0/0 | 37237 | 258/358 | 78/119 |
NS Not surveyed