Observations on an Aggregation of Grey Reef Sharks (Carcharhinus amblyrhynchos) in the Mozambique Channel Off the Coast of Nosy Be (Madagascar) and Tools for Photo-Identification—A New Aggregation Nursery Site?-Reference-Cited by-同舟云学术

Observations on an Aggregation of Grey Reef Sharks (Carcharhinus amblyrhynchos) in the Mozambique Channel Off the Coast of Nosy Be (Madagascar) and Tools for Photo-Identification—A New Aggregation Nursery Site?

Published:2024-08-26 Issue:9 Volume:13 Page:661
ISSN:2079-7737
Container-title:Biology
language:en
Short-container-title:Biology

Author:

Micarelli Primo¹²^ORCID,Pireddu Marco³,Persia Damiano⁴,Sanna Marco³,Vicariotto Consuelo¹,Pacifico Antonio⁵^ORCID,Storelli Pietro¹,Mahrer Makenna⁶,Venanzi Emanuele⁷,Reinero Francesca Romana¹^ORCID

Affiliation:

1. Sharks Studies Center—Scientific Institute, 58024 Massa Marittima, Italy

2. Department of Physical Sciences, Earth and Environment, University of Siena, 53100 Siena, Italy

3. Department of Life and Environmental Sciences, University of Cagliari, 09126 Cagliari, Italy

4. Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy

5. Department of Economics and Law, University of Macerata, 62100 Macerata, Italy

6. W. M. Keck Science Department, Claremont McKenna College, Claremont, CA 91711, USA

7. Manta Diving Nosy Be, Nosy Be 207, Madagascar

Abstract

Following preliminary underwater observations of about 1000 h carried out monthly between 2012 and 2023 (except the years 2021 and 2022), 23 specimens of grey reef sharks were spotted and photo-identified off the coast of Nosy Be in Madagascar, on an emerging reef called “Mokarran” at a depth between 15 and 30 m. Over 10 years of observations, eight specimens were re-sighted, identified with a non-invasive photo-identification technique of part of the first dorsal and the caudal fin, and one specimen was re-identified after 1982 days from the first sighting, i.e., after more than 5 years. In addition, six specimens of probably pregnant females were also identified in the same area. The population was entirely made up of females. The aggregation area could represent a new nursery site which, if confirmed after further investigations, will require greater protection.

Publisher

MDPI AG

Link

https://www.mdpi.com/2079-7737/13/9/661/pdf

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