ENVIRONMENTAL FACTORS INFLUENCING WHALE SHARK OCCURRENCE AND MOVEMENTS AT MAFIA ISLAND, TANZANIA Christoph A. Rohner & Simon J. Pierce | Marine Megafauna Foundation Michael Berumen, Jesse Cochran & Fernando Cagua | KAUST University Mathias Igulu & Baraka Kuguru | Tanzanian Fisheries Research Institute Jason Rubens | World Wide Fund for Nature WWF Project Report Environmental factors influencing whale shark occurrence & movements at Mafia Island, Tanzania Christoph A. Rohner 1 & Simon J. Pierce 1,2 Michael Berumen3,4, Jesse Cochran3 & Fernando Cagua3 Mathias Igulu5 & Baraka Kuguru5 Jason Rubens6 1 Manta Ray and Whale Shark Research Centre, Marine Megafauna Foundation, Praia do Tofo, Inhambane, Mozambique 2 Wild Me, Praia do Tofo, Inhambane, Mozambique 3 Coral Reef Ecology Laboratory, Red Sea Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia 4 Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States of America 5 Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania 6 World Wide Fund for Nature, Dar es Salaam, Tanzania Chris Rohner:
[email protected] +255 (0)76 490 0044 Simon Pierce:
[email protected] +44 74 288 39945 Michael Berumen:
[email protected] +966 54 470 0019 Mathias Igulu:
[email protected] +255 (0)78 684 4878 Jason Rubens:
[email protected] +255 (0)75 422 9450 WWF – Mafia Island whale shark study 1. Executive Summary The whale shark Rhincodon typus is the largest fish in the world. Its size, gentle nature and tendency to swim at the surface in predictable coastal aggregation sites means that it can be a focal species for marine tourists. Whale sharks are categorised on the IUCN Red List as ‘Vulnerable’ to extinction following fishery-induced declines in some parts of the world.