TY  - JOUR
A1  - Korniienko, Yevheniia
A1  - Tiedemann, Ralph
A1  - Vater, Marianne
A1  - Kirschbaum, Frank
T1  - Ontogeny of the electric organ discharge and of the papillae of the electrocytes in the weakly electric fish Campylomormyrus rhynchophorus (Teleostei: Mormyridae)
JF  - The journal of comparative neurology
N2  - The electric organ of the mormyrid weakly electric fish,Campylomormyrus rhynchophorus(Boulenger, 1898), undergoes changes in both the electric organ discharge (EOD) and the light and electron microscopic morphology as the fish mature from the juvenile to the adult form. Of particular interest was the appearance of papillae, surface specializations of the uninnervated anterior face of the electrocyte, which have been hypothesized to increase the duration of the EOD. In a 24.5 mm long juvenile the adult electric organ (EO) was not yet functional, and the electrocytes lacked papillae. A 40 mm long juvenile, which produced a short biphasic EOD of 1.3 ms duration, shows small papillae (average area 136 mu m(2)). In contrast, the EOD of a 79 mm long juvenile was triphasic. The large increase in duration of the EOD to 23.2 ms was accompanied by a small change in size of the papillae (average area 159 mu m(2)). Similarly, a 150 mm long adult produced a triphasic EOD of comparable duration to the younger stage (24.7 ms) but featured a prominent increase in size of the papillae (average area 402 mu m(2)). Thus, there was no linear correlation between EOD duration and papillary size. The most prominent ultrastructural change was at the level of the myofilaments, which regularly extended into the papillae, only in the oldest specimen-probably serving a supporting function. Physiological mechanisms, like gene expression levels, as demonstrated in someCampylomormyrusspecies, might be more important concerning the duration of the EOD.
KW  - Campylomormyrus
KW  - electric organ discharge
KW  - electrocyte ontogeny
KW  - electrocyte ultrastructure
KW  - papillae
Y1  - 2020
U6  - https://doi.org/10.1002/cne.25003
SN  - 0021-9967
SN  - 1096-9861
VL  - 529
IS  - 5
SP  - 1052
EP  - 1065
PB  - Wiley
CY  - Hoboken
ER  -