Dataset

Basking Shark Project - global citizen science observations of Cetorhinus maximus

OBIS UK MeasurementOrFact Open in mapper Explore occurrences

This dataset details approved records from the Shark Trust's Basking Shark Project. This dataset is in part comprised of records from the Marine Conservation Society's Basking Shark Watch (1986-2018), and data provided from the Manx Whale and Dolphin Watch.

Comprised of citizen science observations, records of Basking Sharks (sighted from land or at sea) from around the world have been complied to help better understand this species. Data comes mostly from ad-hoc records, with some observations recorded from more structured surveys and data uploads from partner organisations.

Citation: Allen H, Gordon C (2026). Basking Shark Project - global citizen science observations of Cetorhinus maximus. Version 1.1. Shark Trust. Samplingevent dataset. https://www.dassh.ac.uk/ipt/resource?r=st_baskingsharkproject&v=1.1

Published: April 30, 2026 at 08:50

First registration: April 30, 2026 at 08:59

License: This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License

URL: https://www.dassh.ac.uk/ipt/resource?r=st_baskingsharkproject

Contacts:

Harriet Allen
Shark Trust

Cat Gordon
Shark Trust

17,797
occurrence records
23,234
measurements and facts
1
taxa
1
species

Taxa

Missing and invalid fields

Field Missing Invalid
coordinateUncertaintyInMeters 17,797
100.0%
maximumDepthInMeters 17,797
100.0%
minimumDepthInMeters 17,797
100.0%

Quality flags

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

Flag Dropped Records
NO_DEPTH 17,797
100.0%
ON_LAND 1,966
11.0%

Measurement types

DNA derived data