Sightings of cetaceans were recorded daily, at 6 different fixed periods (snap shots), when the boat was in navigation or search mode. Sightings were recorded at distances shorter and larger than 300 meters from the boat.

Citation: Machete, M.; Institute of Marine Research (IMAR), Portugal; Department of Oceanography and Fisheries, University of the Azores (DOP/UAC), Portugal; (2016): POPA- Fisheries Observer Program of the Azores: Marine mammal sightings in the Azores tuna fishery from 1998 on: during navigation or search mode. https://dx.doi.org/10.14284/19

Published: September 17, 2025 at 08:40

URL: http://ipt.vliz.be/eurobis/resource?r=popa_marine_mammals_sightings_1998_2013

Miguel Machete
University of the Azores; Department of Oceanography and Fisheries

Institute of Marine Research
Institute of Marine Research

University of the Azores; Department of Oceanography and Fisheries
University of the Azores; Department of Oceanography and Fisheries

Diana Catarino
University of the Azores; Department of Oceanography and Fisheries

26,520

occurrence records

taxa

species

Taxa

Missing and invalid fields

Field	Missing	Invalid
maximumDepthInMeters	26,520		100.0%
minimumDepthInMeters	26,520		100.0%

Quality flags

The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.

Flag	Dropped	Records
NO_DEPTH		26,520	100.0%
ON_LAND		209	0.8%

POPA- Fisheries Observer Program of the Azores: Marine mammal sightings in the Azores tuna fishery from 1998 on: during navigation or search mode

Taxa

Missing and invalid fields

Quality flags

Measurement types

DNA derived data