Changes in the swimming activity and the glutathione S-transferase activity of Jenynsia multidentata fed with microcystin-RR

CAZENAVE, JIMENA; NORES, MARÍA LAURA; MICELI, MARTÍN; DÍAZ, MARÍA DEL PILAR; WUNDERLIN, DANIEL A.; BISTONI, MARÍA DE LOS ÁNGELES

Elsevier

Año: 2008 vol. 42 p. 1299 - 1299

e report the effects of sublethal doses of microcystin-RR (MC-RR) on the swimming activity of Jenynsia multidentata as well as the simultaneous response of its detoxication system by measuring glutathion S-transferase (GST) activities in the liver and brain of fish. MC-RR was applied on the food pellets at doses of 0.01, 0.1 and 1mg g1. Swimming activity was recorded 10min each hour over 24 h by using a computer-based image processing system, which facilitates quantification of two measures of fish swimming behaviour (average velocity, movement percentage). Results show that low levels of cyanotoxin increased the swimming activity, while the highest dose used produced significant changes with respect to control group only since approximately 20 h of exposure, when the swimming activity was decreased. On the other hand, GST activity was significantly increased only in the liver and brain of fish fed with the highest MC-RR dose. Both results sugges