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Characterization of Atlantic cod spawning habitat and behavior in Icelandic coastal waters

December 7, 2012

The physical habitat used during spawning may potentially be an important factor affecting reproductive output of broadcast spawning marine fishes, particularly for species with complex, substrate-oriented mating systems and behaviors, such as Atlantic cod Gadus morhua. We characterized the habitat use and behavior of spawning Atlantic cod at two locations off the coast of southwestern Iceland during a 2-d research cruise (15–16 April 2009). We simultaneously operated two different active hydroacoustic gear types, a split beam echosounder and a dual frequency imaging sonar (DIDSON), as well as a remotely operated underwater vehicle (ROV). A total of five fish species were identified through ROV surveys: including cusk Brosme brosme, Atlantic cod, haddock Melanogrammus aeglefinus, lemon sole Microstomus kitt, and Atlantic redfish Sebastes spp. Of the three habitats identified in the acoustic surveys, the transitional habitat between boulder/lava field and sand habitats was characterized by greater fish density and acoustic target strength compared to that of sand or boulder/lava field habitats independently. Atlantic cod were observed behaving in a manner consistent with published descriptions of spawning. Individuals were observed ascending 1–5 m into the water column from the bottom at an average vertical swimming speed of 0.20–0.25 m s−1 and maintained an average spacing of 1.0–1.4 m between individuals. Our results suggest that cod do not choose spawning locations indiscriminately despite the fact that it is a broadcast spawning fish with planktonic eggs that are released well above the seafloor.

Citation Information

Publication Year 2012
Title Characterization of Atlantic cod spawning habitat and behavior in Icelandic coastal waters
DOI 10.1371/journal.pone.0051321
Authors Timothy B. Grabowski, Kevin M. Boswell, Bruce J. McAdam, R. J. David Wells, Gudrún Marteinsdóttir
Publication Type Article
Publication Subtype Journal Article
Series Title PLoS ONE
Index ID 70148127
Record Source USGS Publications Warehouse
USGS Organization Coop Res Unit Atlanta

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