Table 1 Sightings, numbers, and group sizes from visual surveys in the dry and wet seasons
Survey period | Survey time | Sightings | Sighting rate (Sightings/km²) | Number of finless porpoises | Largest group |
|---|---|---|---|---|---|
Dry season | 20,221,115 | 6 | 0.139 | 8 | 3 |
20,221,124 | 3 | 0.070 | 9 | 3 | |
20,230,303 | 4 | 0.093 | 5 | 2 | |
20,230,328 | 3 | 0.070 | 5 | 2 | |
20,230,331 | 2 | 0.046 | 5 | 3 | |
Mean ± SD |  | 3.60 ± 1.52 | 0.08 ± 0.04 | 6.40 ± 1.95 | 2.60 ± 0.55 |
Wet season | 20,230,627 | 4 | 0.093 | 12 | 5 |
20,230,628 | 2 | 0.046 | 3 | 2 | |
20,230,712 | 3 | 0.070 | 5 | 3 | |
20,230,713 | 1 | 0.023 | 1 | 1 | |
20,230,805 | 2 | 0.046 | 4 | 2 | |
20,230,806 | 3 | 0.070 | 6 | 2 | |
20,230,813 | 3 | 0.070 | 6 | 2 | |
Mean ± SD |  | 2.57 ± 0.96 | 0.06 ± 0.02 | 5.29 ± 3.45 | 2.43 ± 1.27 |