Accession Number : ADA564207


Title :   Relative Condition Factors of Fish as Bioindicators One Year after the Deepwater Horizon Oil Spill


Descriptive Note : Research rept. 7 Jan 2010-30 Jan 2012


Corporate Author : BTG RESEARCH COLORADO SPRINGS CO


Personal Author(s) : Courtney, Joshua ; Klinkmann, Taylor ; Courtney, Amy ; Torano, Joseph ; Courtney, Michael


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA564207


Report Date : 01 Feb 2012


Pagination or Media Count : 14


Abstract : Creel surveys were performed over a three week period in late spring, 2011, in the Lafourche and Calcasieu area estuaries of the Louisiana Gulf Coast. Weights and lengths were measured for black drum (Pogonias cromis), red drum (Sciaenops ocellatus), and spotted seatrout (Cynoscion nebulosus), and relative condition factors were calculated relative to expected weights from the long term (5 year) Louisiana data for each species. A normal relative condition factor is 1.00. The mean relative condition factors in the Lafourche area were black drum, 0.955 +/- 0.020; red drum, 0.955 +/- 0.011; spotted seatrout, 0.994 +/- 0.009. In the Calcasieu area, the mean relative condition factors were black drum, 0.934 +/- 0.017; red drum, 0.965 +/- 0.014; spotted seatrout, 0.971 +/- 0.010. Results suggest that the abundance of primary food sources for black drum and red drum in Lafourche, including oysters and crab, were likely affected by the oil spill and continued to be reduced one year later. Increased harvest of oysters and blue crab in the Calcasieu area (in part to make up for the ban in most of Louisiana) resulted in less food for the black drum and red drum there, also. Spotted seatrout eat mainly shrimp and small fish and showed no significant reduction in relative condition factor in Lafourche and a slight reduction in Calcasieu one year after the oil spill.


Descriptors :   *ECOSYSTEMS , *FISHES , *FOOD CHAINS , *OIL SPILLS , BODY WEIGHT , GROWTH(PHYSIOLOGY) , MEXICO GULF , PHYSIOLOGICAL EFFECTS , SURVEYS


Subject Categories : Ecology
      Biological Oceanography
      Noise Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE