scholarly journals Limited latitudinal ranging of juvenile whale sharks in the Western Indian Ocean suggests the existence of regional management units

2018 ◽  
Vol 601 ◽  
pp. 167-183 ◽  
Author(s):  
CEM Prebble ◽  
CA Rohner ◽  
SJ Pierce ◽  
DP Robinson ◽  
MY Jaidah ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Western Indian Ocean ◽  
Management Units ◽  
Regional Management ◽  
Whale Sharks

scholarly journals Regional Management of Areas beyond National Jurisdiction in the Western Indian Ocean: State of Play and Possible Ways Forward

2017 ◽  
Vol 32 (4) ◽  
pp. 765-796 ◽  
Author(s):  
Glen Wright ◽  
Julien Rochette
Keyword(s):  
Indian Ocean ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Western Indian Ocean ◽  
Marine Biodiversity ◽  
International Organisations ◽  
Management Tools ◽  
Regional Management ◽  
National Jurisdiction ◽  
Regional Organisations

Abstract In recent years, the international community has become increasingly aware of the growing threats to marine biodiversity in areas beyond national jurisdiction (abnj), and international discussions on a new international legally binding are underway. In parallel, some States, through regional organisations, have progressively extended their activities into abnj, particularly through the development of area-based management tools (abmts). In this article, we consider how actors in the Western Indian Ocean (wio) might engage in abnj governance. In particular, we develop some possible scenarios for developing abmts in the wio, including through the development of fisheries closures, the establishment of marine protected areas (mpas), and the adoption of abmts under the auspices of relevant international organisations. We conclude that while the wio is currently not the most advanced region in terms of ongoing efforts to improve the governance of abnj, there are already some positive signals and promising options for the future.

scholarly journals Demographics and feeding ecology of whale sharks at Mafia Island, Tanzania

2013 ◽  
Author(s):  
Edgar F Cagua ◽  
Jesse Cochran ◽  
Chris Rohner ◽  
Mathias M Igulu ◽  
Jason Rubens ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Site Fidelity ◽  
Western Indian Ocean ◽  
Sampling Effort ◽  
Whale Shark ◽  
Important Region ◽  
Whale Sharks ◽  
Acoustic Array ◽  
And Gender ◽  
Almost All

Background. The Western Indian Ocean is a globally important region for the whale shark Rhincodon typus, with well-studied coastal aggregation sites in southern Mozambique, Seychelles and Djibouti. Here we present an overview of a new study at Mafia Island, Tanzania. Methods. We monitored whale shark abundances on 103 boat trips from October 2012–March 2013. We also used passive acoustic telemetry (VEMCO® V16 tags) and photographic identification to monitor the residency times and local movements of 29 tagged individuals. Shark sizes were estimated using laser photogrammetry. Results. In total we observed 87 individual sharks with a mean of 5.1 ± 5.2 (± SD) per trip and a peak in December of 8.2 ± 6.3. Total length ranged from 4.1 to 9.7 m and almost all sharks were immature. After boat-based visual observations dropped to zero in March 2013 (with the same ongoing sampling effort), the acoustic array still detected 75% of tagged sharks. Tagged individuals were detected by the acoustic array for 73 ± 40 days on average. They showed a strong site fidelity to a 15 km2 area in the inner part of the bay and then progressively moved offshore at the end of the season, matching a decrease in plankton abundance. Sharks were mostly observed feeding on dense patches of the pelagic shrimp Lucifer hanseni, often in association with planktivorous fishes. Photo IDs from 2007-09 and 2012-13 indicate that a large proportion of the juvenile individuals return to Mafia Island each spring-summer. Conclusion. The size range and gender distribution of whale sharks at Mafia Island is similar to other coastal aggregations in the Indian Ocean, but the relatively high site fidelity and residency time stands in contrast.

scholarly journals Demographics and feeding ecology of whale sharks at Mafia Island, Tanzania

2013 ◽  
Author(s):  
Edgar F Cagua ◽  
Jesse Cochran ◽  
Chris Rohner ◽  
Mathias M Igulu ◽  
Jason Rubens ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Site Fidelity ◽  
Western Indian Ocean ◽  
Sampling Effort ◽  
Whale Shark ◽  
Important Region ◽  
Whale Sharks ◽  
Acoustic Array ◽  
And Gender ◽  
Almost All

Background. The Western Indian Ocean is a globally important region for the whale shark Rhincodon typus, with well-studied coastal aggregation sites in southern Mozambique, Seychelles and Djibouti. Here we present an overview of a new study at Mafia Island, Tanzania. Methods. We monitored whale shark abundances on 103 boat trips from October 2012–March 2013. We also used passive acoustic telemetry (VEMCO® V16 tags) and photographic identification to monitor the residency times and local movements of 29 tagged individuals. Shark sizes were estimated using laser photogrammetry. Results. In total we observed 87 individual sharks with a mean of 5.1 ± 5.2 (± SD) per trip and a peak in December of 8.2 ± 6.3. Total length ranged from 4.1 to 9.7 m and almost all sharks were immature. After boat-based visual observations dropped to zero in March 2013 (with the same ongoing sampling effort), the acoustic array still detected 75% of tagged sharks. Tagged individuals were detected by the acoustic array for 73 ± 40 days on average. They showed a strong site fidelity to a 15 km2 area in the inner part of the bay and then progressively moved offshore at the end of the season, matching a decrease in plankton abundance. Sharks were mostly observed feeding on dense patches of the pelagic shrimp Lucifer hansoni, often in association with planktivorous fishes. Photo IDs from 2007-09 and 2012-13 indicate that a large proportion of the juvenile individuals return to Mafia Island each spring-summer. Conclusion. The size range and gender distribution of whale sharks at Mafia Island is similar to other coastal aggregations in the Indian Ocean, but the relatively high site fidelity and residency time stands in contrast.

A review of marine invertebrates used as fishing baits and the implications for national and regional management in the Western Indian Ocean

2021 ◽  
pp. 237-263
Author(s):  
Carol A Simon ◽  
Agnes WN Muthumbi ◽  
Charles M Kihia ◽  
Kyle MS Smith ◽  
Riaan B Cedras ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Marine Invertebrates ◽  
Western Indian Ocean ◽  
Regional Management

scholarly journals Population structure enhances perspectives on regional management of the western Indian Ocean green turtle

2015 ◽  
Vol 16 (5) ◽  
pp. 1069-1083 ◽  
Author(s):  
Jérôme Bourjea ◽  
Jeanne A. Mortimer ◽  
Julie Garnier ◽  
Gladys Okemwa ◽  
Brendan J. Godley ◽  
...  
Keyword(s):  
Population Structure ◽  
Indian Ocean ◽  
Green Turtle ◽  
Western Indian Ocean ◽  
Regional Management

scholarly journals Demographics and feeding ecology of whale sharks at Mafia Island, Tanzania

2013 ◽  
Author(s):  
Edgar F Cagua ◽  
Jesse Cochran ◽  
Chris Rohner ◽  
Mathias M Igulu ◽  
Jason Rubens ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Site Fidelity ◽  
Western Indian Ocean ◽  
Sampling Effort ◽  
Whale Shark ◽  
Important Region ◽  
Whale Sharks ◽  
Acoustic Array ◽  
And Gender ◽  
Almost All

Background. The Western Indian Ocean is a globally important region for the whale shark Rhincodon typus, with well-studied coastal aggregation sites in southern Mozambique, Seychelles and Djibouti. Here we present an overview of a new study at Mafia Island, Tanzania. Methods. We monitored whale shark abundances on 103 boat trips from October 2012–March 2013. We also used passive acoustic telemetry (VEMCO® V16 tags) and photographic identification to monitor the residency times and local movements of 29 tagged individuals. Shark sizes were estimated using laser photogrammetry. Results. In total we observed 87 individual sharks with a mean of 5.1 ± 5.2 (± SD) per trip and a peak in December of 8.2 ± 6.3. Total length ranged from 4.1 to 9.7 m and almost all sharks were immature. After boat-based visual observations dropped to zero in March 2013 (with the same ongoing sampling effort), the acoustic array still detected 75% of tagged sharks. Tagged individuals were detected by the acoustic array for 73 ± 40 days on average. They showed a strong site fidelity to a 15 km2 area in the inner part of the bay and then progressively moved offshore at the end of the season, matching a decrease in plankton abundance. Sharks were mostly observed feeding on dense patches of the pelagic shrimp Lucifer hanseni, often in association with planktivorous fishes. Photo IDs from 2007-09 and 2012-13 indicate that a large proportion of the juvenile individuals return to Mafia Island each spring-summer. Conclusion. The size range and gender distribution of whale sharks at Mafia Island is similar to other coastal aggregations in the Indian Ocean, but the relatively high site fidelity and residency time stands in contrast.

Editorial Introduction

2020 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Editors of the JIOWS
Keyword(s):  
Nineteenth Century ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Late Nineteenth Century ◽  
Fourth Volume ◽  
History Of ◽  
The Indian Ocean ◽  
Complex Relationships ◽  
Indian Ocean World ◽  
Shed Light

The editors are proud to present the first issue of the fourth volume of the Journal of Indian Ocean World Studies. This issue contains three articles, by James Francis Warren (Murdoch University), Kelsey McFaul (University of California, Santa Cruz), and Marek Pawelczak (University of Warsaw), respectively. Warren’s and McFaul’s articles take different approaches to the growing body of work that discusses pirates in the Indian Ocean World, past and present. Warren’s article is historical, exploring the life and times of Julano Taupan in the nineteenth-century Philippines. He invites us to question the meaning of the word ‘pirate’ and the several ways in which Taupan’s life has been interpreted by different European colonists and by anti-colonial movements from the mid-nineteenth century to the present day. McFaul’s article, meanwhile, takes a literary approach to discuss the much more recent phenomenon of Somali Piracy, which reached its apex in the last decade. Its contribution is to analyse the works of authors based in the region, challenging paradigms that have mostly been developed from analysis of works written in the West. Finally, Pawelczak’s article is a legal history of British jurisdiction in mid-late nineteenth-century Zanzibar. It examines one of the facets that underpinned European influence in the western Indian Ocean World before the establishment of colonial rule. In sum, this issue uses two key threads to shed light on the complex relationships between European and other Western powers and the Indian Ocean World.

scholarly journals Factors influencing microbial mat composition, distribution and dinitrogen fixation in three western Indian Ocean coral reefs

2012 ◽  
Vol 47 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Loïc Charpy ◽  
Katarzyna A. Palinska ◽  
Raeid M. M. Abed ◽  
Marie José Langlade ◽  
Stjepko Golubic
Keyword(s):  
Indian Ocean ◽  
Coral Reefs ◽  
Western Indian Ocean ◽  
Dinitrogen Fixation ◽  
Microbial Mat ◽  
Composition Distribution ◽  
Factors Influencing

scholarly journals Movement ecology of black marlin Istiompax indica in the Western Indian Ocean

2021 ◽  
Author(s):  
Christoph A. Rohner ◽  
Roy Bealey ◽  
Bernerd M. Fulanda ◽  
Jason D. Everett ◽  
Anthony J. Richardson ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Movement Ecology ◽  
Western Indian Ocean

scholarly journals Post-bleaching mortality of a remote coral reef community in Seychelles, Western Indian Ocean

2019 ◽  
Vol 18 (1) ◽  
pp. 11
Author(s):  
Elena Gadoutsis ◽  
Clare A.K. Daly ◽  
Julie P. Hawkins ◽  
Ryan Daly
Keyword(s):  
Coral Reef ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Coral Reef Community ◽  
Reef Community
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