Micronektonic fish species over three seamounts in the southwestern Indian Ocean

Type Article
Date 2020-06
Language English
Author(s) Cherel Yves1, Romanov Evgeny V.2, Annasawmy Pavanee3, Thibault Delphine3, 4, Ménard Frédéric4
Affiliation(s) 1 : Centre d’Etudes Biologiques de Chizé (CEBC), UMR 7372 CNRS-La Rochelle Université, Villiers-en-Bois, France
2 : Centre Technique d’Appui à la Pêche Réunionnaise (CAP RUN) - NEXA, Le Port, Ile de La Réunion, France
3 : Marine Biodiversity, Exploitation and Conservation (MARBEC), UMR CNRS-Ifremer-IRD-Université de Montpellier, LMI ICEMASA, Cape Town, South Africa
4 : Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO, Marseille, France
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Elsevier BV), 2020-06 , Vol. 176 , P. 104777 (10p.)
DOI 10.1016/j.dsr2.2020.104777
WOS© Times Cited 11
Keyword(s) Ceratoscopelus warmingii, Diaphus suborbitalis, Sigmops elongatus, Lanternfish, Tropical waters

Taxonomic composition, abundance and biological features of micronektonic fish were investigated using pelagic trawls conducted near and over the summits of three seamounts located in the western Indian Ocean (La Pérouse, MAD-Ridge and Walters Shoal). Mesopelagic fish from three families accounted for 80% by number of the total catch (5714 specimens, 121 taxa), namely myctophids (59%), gonostomatids (12%) and sternoptychids (9%). Whereas the gonostomatid Sigmops elongatus was the most abundant species around La Pérouse seamount, myctophids were the most diverse and dominant group by number in all three studied areas. Most myctophids were high-oceanic species, which included the numerically dominant Benthosema suborbitale, Ceratoscopelus warmingii, Diaphus perspicillatus, Hygophum hygomii, and Lobianchia dofleini. The few remaining myctophids (Diaphus suborbitalis being the most abundant) were pseudoceanic fish, highlighting the association with landmasses. The study adds one myctophid species new to the Indian Ocean (Diaphus bertelseni), and a second record in the literature of the recently described sternoptychid Argyripnus hulleyi.

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