Thresher Shark
Also known as: Alopias / pelagic thresher · Fox shark (common name abroad) · Lagoy or pating (local shark names)
Definition
Thresher sharks (family Alopiidae) are large sharks instantly recognizable by the greatly elongated upper lobe of their tails, which they whip to stun schooling fish. In the Philippines, Monad Shoal off Malapascua Island in Cebu is world-famous as one of the only places where thresher sharks, chiefly the pelagic thresher, can be reliably seen by divers at dawn cleaning stations (Wikipedia).
Identities
| Source Type | Identity |
|---|---|
| Wikipedia | Thresher shark |
| Wikidata | Q627902 |
| DBpedia | Thresher_shark |
| ProductOntology | N/A |
| Wiktionary | N/A |
| Library of Congress Subject Headings (LCSH) | Sharks |
| MeSH | N/A |
| NCBI Taxonomy | Alopias pelagicus |
| AGROVOC | sharks |
| Google Scholar | thresher shark Malapascua Monad Shoal dive tourism conservation |
| ConceptNet | shark |
| OpenCyc | N/A |
Also Known As
- Alopias / pelagic thresher
- Fox shark (common name abroad)
- Lagoy or pating (local shark names)
Examples and Analogies
- Tail as Weapon: A thresher shark hunts like a swordsman who fights with the scabbard, using its whip-like tail to strike and daze fish before turning to eat.
- Alarm Clock Dive Site: Monad Shoal’s dawn assemblies run like a natural schedule, with sharks rising to cleaning stations as reliably as commuters to morning trains.
Usage Scenarios
1. Dive-Tourism Economy
Dive shops on Malapascua run early-morning trips to Monad Shoal, making the thresher shark the island’s flagship attraction and a major livelihood source.
2. Marine Research
Scientists use photo-identification of thresher visits to cleaning stations to study population trends, site fidelity, and cleaner-fish ecology.
Strategies
* Regulated diver conduct, such as no-touch distance rules and mooring buoys, keeps cleaning-station behavior undisturbed and tourism sustainable.
* Municipal protection around Malapascua, together with national policy alignment under CITES trade controls, shields the species from targeted fishing.
Security and Safety Measures
* Divers should follow deep-diving and no-decompression protocols, since Monad Shoal encounters occur around 25 to 30 meters.
* Fishers must observe prohibitions and release protocols; threshers are harmless to humans but are themselves vulnerable to gear entanglement.
Historical Context
Malapascua’s thresher dives developed in the 1990s as local operators discovered the shoal’s predictable dawn visits, building an international reputation for the tiny island. Globally, thresher populations declined from targeted and bycatch fishing, leading to inclusion of all three species in CITES Appendix II in 2017, which regulates international trade in their meat and fins.
Challenges and Controversies
Fishing Pressure Outside Sanctuaries
Sharks protected at Monad Shoal roam far beyond it, and bycatch and fin markets elsewhere in Philippine waters remain a threat.
Tourism Carrying Capacity
The popularity of dawn dives raises questions about boat congestion and diver numbers, pushing local stakeholders toward stricter site management.
Related Topic
Malapascua Island