The activity of digestive enzymes of the pike Esox lucius L. Infected with the cestode Triaenophorus nodulosus (Pallas)

Abstract

It has been shown that protease activity increases and amylase activity decreases from the first to the fifth intestinal segment of pike, while lipase and esterase activities vary within fairly narrow limits. The level of proteolytic enzyme activities increases in pikes infected with Triaenophorus nodulosus (Pallas), but the invasion has no effect on amylase, lipase, or esterase activities. The T. nodulosus infection of pike had no sub stantial influence on glycogen or protein content in the hepatopancreas of fish. However, it was noted that the ratio of protease and amylase activities in the intestines changed toward an increase in the share of proteases and the share of protein in the hepatopancreas of infected fish.

Impact of the cestodeTriaenophorus nodulosuson the exoticLepomis gibbosusand the autochthonousPerca fluviatilis

“…In contrast to Eurasian perch, only one pumpkinseed had a PI > 1%, despite there being no significant difference in PI between the two fish species. For the final host, T. nodulosus is less pathogenic in that it does not cause the death of pike even at a very high intensity (up to 200 individuals per host) (Izvekova and Solovyev, 2012).…”

A re-evaluation of conflicting taxonomic structures of EurasianTriaenophorusspp. (Cestoda, Bothriocephalidea: Triaenophoridae) based on partialcox1mtDNA and 28S rRNA gene sequences

“…Extensive literature is devoted to the study of various aspects of Triaenophorus spp. biology, including pathogenicity for its hosts (Kuperman, 1973;Rosen and Dick, 1984;Shostak and Dick, 1986;Valtonen et al, 1989;Ieshko and Evseeva, 1989;Pronin, 1990;Evseeva, 1994;Pasternak et al, 1999;Izvekova, 2001;Rusinek and Kuznedelov, 2001;Dezfuli et al, 2014;Schaufler et al, 2014;Izvekova and Solovyev, 2012, 2013Borvinskaya et al, 2019;Kashinskaya et al, 2021).…”