THE EFFECT OF PARASITISM BY TRYPANORHYNCH PLEROCERCOIDS (CESTODA, TRYPANORHYNCHA) ON THE DIGESTIVE ENZYME ACTIVITY OF CARCINUS MAENAS (LINNAEUS, 1758) (DECAPODA, PORTUNIDAE) BY ROBERT H. GURNEY 1,2 ) , DANIELLE J. JOHNSTON 1,3 ) and BARBARA F. NOWAK 1 ) 1 ) School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Launceston, Tasmania 7250, Australia ABSTRACT European green crabs, Carcinus maenas , infected with trypanorhynch plerocercoids, Dollfusiella martini were studied to determine whether larval cestodiasis had an effect on the digestive enzyme activity of the green crab host. We collected 28 green crabs from Swan Bay, Victoria, removed their digestive glands, counted the plerocercoids and assayed the digestive gland for three enzymes: trypsin, lipase, and α -glucosidase. Regression analysis showed a significant negative relationship between levels of infection and the specific activity of trypsin (r 2 = 0 . 17, d.f. = 1 , 22, p < 0 . 05, y = − 3.91E-06 x + 1.683E-04) and lipase (r 2 = 0 . 40, d.f. = 1 , 23, p < 0 . 001, y = − 2.89E-05 x + 1.615E-03), i.e., the higher the level of infection, the lower the trypsin and lipase activity. No
Crustaceana – Brill
Published: Jan 1, 2006
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