Swimming depth of dolphinfish (Coryphaena hippurus) associated and unassociated with fish aggregating devices

Type Article
Date 2016
Language English
Author(s) Whitney Nicholas M.1, Taquet Marc2, Brill Richard W.3, Girard Charlotte4, Schwieterman Gail D.1, Dagorn Laurent4, Holland Kim N.5
Affiliation(s) 1 : Mote Marine Lab, Behav Ecol & Physiol Program, 1600 Ken Thompson Pkwy, Sarasota, FL 34236 USA.
2 : Inst Rech Dev, EIO, UMR, BP 529, F-98713 Papeete, Tahiti, France.
3 : NOAA, Pacific Isl Fisheries Sci Ctr, Natl Marine Fisheries Serv, 2570 Dole St, Honolulu, HI 96822 USA.
4 : Inst Rech Dev, UMR Marine Biodivers Exploitat & Conservat MARBEC, Ave Jean Monnet CS 30171, F-34203 Sete, France.
5 : Univ Hawaii Manoa, Hawaii Inst Marine Biol, POB 1346, Kaneohe, HI 96744 USA.
Source Fishery Bulletin (0090-0656) (Natl Marine Fisheries Service Scientific Publ Office), 2016 , Vol. 114 , N. 4 , P. 426-434
DOI 10.7755/FB.114.4.5
WOS© Times Cited 5
Abstract

Dolphinfish (Coryphaena hippurus), large pelagic predators and important fishery targets, frequently associate with floating debris or manmade fish aggregating devices (FADs). We tagged 8 dolphinfish with pressure-sensitive ultrasonic transmitters and actively tracked individuals continuously for up to 40 h to elucidate the vertical movement patterns and differences between FADassociated (FAD-A) and FAD-unassociated (FAD-U) fish. Four additional fish were equipped with acoustic transmitters and passively monitored for several days with receivers attached to FADs. When not associated with FADs, dolphinfish used the upper 75-100 m of the water column during the day and made descents up to 160 m during the night. In contrast, FAD-A fish generally stayed within the upper 10 m of the water column and tended to make deeper excursions during the day rather than at night. Water temperature data from expendable bathythermo-graphs deployed during active tracking showed that fish only descended to depths where temperatures were <= 3 degrees C cooler than the uniform-temperature surface layer. The use of vertical behavior to determine whether a dolphinfish is associated or not with a floating object opens the possibility for new, large-scale research aimed at investigating the role of floating objects in the ecosystem inhabited by this species and at assessing the impacts of FADs on its ecology.

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Whitney Nicholas M., Taquet Marc, Brill Richard W., Girard Charlotte, Schwieterman Gail D., Dagorn Laurent, Holland Kim N. (2016). Swimming depth of dolphinfish (Coryphaena hippurus) associated and unassociated with fish aggregating devices. Fishery Bulletin, 114(4), 426-434. Publisher's official version : https://doi.org/10.7755/FB.114.4.5 , Open Access version : https://archimer.ifremer.fr/doc/00626/73811/