Fishes associated with pelagic Sargassum and open water lacking Sargassum in the Gulf Stream off North Carolina

Casazza, Tara L. and Ross, Steve W. (2008) Fishes associated with pelagic Sargassum and open water lacking Sargassum in the Gulf Stream off North Carolina. Fishery Bulletin, 106(4), pp. 348-363.

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Abstract

The community structure of fishes associated with pelagic Sargassum spp. and open water lacking Sargassum was examined during summer and fall cruises, 1999–2003, in the Gulf Stream off North Carolina. Significantly more individual fishes (n= 18,799), representing at least 80 species, were collected from samples containing Sargassum habitat, compared to 60 species (n=2706 individuals) collected from openwater habitat. The majority (96%) of fishes collected in both habitats were juveniles, and planehead filefish (Stephanolepis hispidus) dominated both habitats. Regardless of sampling time (day or night), Sargassum habitat yielded significantly higher numbers of individuals and species compared with open-water collections. Overall, fishes collected by neuston net tows from Sargassum habitat were significantly larger in length than fishes collected from open-water habitat with neuston nets. A significant positive, linear relationship existed between numbers of fishes and the quantity of Sargassum collected by neuston net. Underwater video recordings indicated a layered structure of fishes among and below the algae and that smaller fishes were more closely associated with the algae than larger fishes. Observations of schooling behaviors of filefishes (Monacanthidae), dolphinfish (Coryphaena hippurus), and jacks (Carangidae), and fish-jellyfish associations were also recorded with an underwater video camera. Our data indicate that Sargassum provides a substantial nursery habitat for many juvenile fishes off the U.S. southeast coast.

Item Type: Article
Title: Fishes associated with pelagic Sargassum and open water lacking Sargassum in the Gulf Stream off North Carolina
Personal Creator/Author:
CreatorsEmail
Casazza, Tara L.
Ross, Steve W.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 4
Page Range: pp. 348-363
Date: 2008
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8817
Depositing User: Patti M. Marraro
Date Deposited: 12 Jun 2012 17:55
Last Modified: 12 Jun 2012 17:55
URI: http://aquaticcommons.org/id/eprint/8817

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