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A Study on the Use of Hydroacoustic and Biological Surveying to Assess Fish Populations in the Altamaha and MacKay Rivers
PIs: Daniela Di Iorio and Gary Grossman (Univ. of Georgia, Athens, GA, USA)
Support: Sea Grant College Program (R/AT-9-PD)
Timeframe: 2002 - 2004
We will carry out both trawl and gill net sampling to identify the species composition and size distribution for comparison to acoustic signatures at 5 or 6 sampling sites along the river axis.
Thus far two experiments have been carried out to compare seasonal differences using the RV Georgia Bulldog, Marine Extension Service, Brunswick GA. The first experiment was in Oct 2002 for three days and the data have been analyzed by a postdoctoral assistant and an undergraduate research assistant (Tamarack , 2003) with further detailed analyses underway for publication. The second experiment was carried out in Apr 2003 for three days, which was partially funded by the Marine Extension Service. Bay anchovy was the most abundant species during October comprising more than 95% of the total catch from trawls, whereas the spring sampling showed a significant reduction in total catch and somewhat smaller sizes for all species, with star drum, croaker and bay anchovy the most common depending on location within the estuary.
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|This page was updated October 13, 2006|