Acoustic monitoring of Atlantic cod (Gadus morhua) in Massachusetts Bay

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Hernandez, K. M., Risch, D., Cholewiak, D. M., Dean, M. J., Hatch, L. T., Hoffman, W. S., … Van Parijs, S. M. (2013). Acoustic monitoring of Atlantic cod (Gadus morhua) in Massachusetts Bay: Implications for management and conservation. ICES Journal of Marine Science, 70(3), 628-635. doi:10.1093/icesjms/fst003
TitleAcoustic monitoring of Atlantic cod (Gadus morhua) in Massachusetts Bay
AuthorsK. Hernandez, D. Risch, D. Cholewiak, M. Dean, L. Hatch, W. Hoffman, A. Rice, D. Zemeckis, S. Van Parijs
AbstractAtlantic cod (Gadus morhua) stocks in northeastern US waters are depleted and stock recovery has been slow; research into the spawning behaviour of this species can help inform conservation and management measures. Male cod produce low-frequency grunts during courtship and spawning. Passive acoustic monitoring (PAM) offers a different perspective from which to investigate the occurrence, spatial extent and duration of spawning cod aggregations. A marine autonomous recording unit was deployed in the "Spring Cod Conservation Zone" (SCCZ) located in Massachusetts Bay, western Atlantic, to record cod grunts from April-June 2011. Cod grunts were present on 98.67% of the recording days (n = 75 days). They occurred across all 24 h, although significantly more grunts were found during the day than night-time (p = 0.0065). Grunt durations ranged from 57-360 ms, and the fundamental frequency and second harmonic had mean peak frequencies of 49.7 ± 5.6 and 102.9 Hz ± 10.9 sd, respectively. Cod grunt rates were low compared with those reported for other spawning fish, and may be indicative of diel movement patterns. Next steps will focus on expanding PAM coverage within the SCCZ, alongside prospecting for unknown spawning grounds within existing archival data. © 2013 © United States Government [NOAA] 2013. Published by Oxford University Press.
JournalICES Journal of Marine Science
Start page628
End page635
Subjectsacoustic property, aggregation behavior, conservation management, courtship, data set, gadoid, monitoring, movement, spawning, Atlantic Ocean, Gulf of Maine, Massachusetts, Massachusetts Bay, United States
NoteFish and Fisheries, CODEN: ICESE