Drastic Population Decline

Generally, there are no data on the population of the Pelagic Thresher sharks. However, the Pelagic thresher sharks (Alopias pelagicus) experienced a decline in population trends, particularly from 2010 – 2014. From the Northwest Pacific, the stock was projected to be reduced by over 34.3% from over 20 years and that the stock is considered overexploited. The species is estimated to be declined both in the Pacific and Indian Oceans with an estimated population reduction of 50-79% over the last three generations.

Source: IUCN Red List


Thresher Shark Project Indonesia
Alor Island, East Nusa Tenggara
[email protected]


Thresher Shark Project Indonesia was founded in 2018 and initially supported by the Conservation Leadership Programme for Asia Pacific Region. Our work aiming to protect endangered pelagic thresher shark (Alopias pelagicus) in Alor Island, Indonesia through investigating the critical habitat, socio-economic importance of the species for the community and conservation outreach to local schools. We combine research and community engagement to inform policy decision for local protection of the species.

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