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Study about the ontogenetic development of cephalic sensory system of Cottus Gobio Linaeus 1758 (Pisces; Cottidae)

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Author(s): Ilie C. TELCEAN | István SAS | Nicoleta R. RADU

Journal: Analele Universitatii din Oradea, Fascicula Biologie
ISSN 1224-5119

Volume: TOM XII;
Start page: 31;
Date: 2005;
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Keywords: Cottus gobio | lateral-cephalic sensory system | fish ontogeny

ABSTRACT
The lateral-cephalic channels system of Cotus gobio L. was studied for a number of 66 juveniles originated from the upper Tisa River. The topography of cephalic channels system and the number of their opening pores present a lot of similarities between different fishes groups that is close related in their phylogeny. The jointly characters are in fact the results of convergent evolution.The study on the ontogenesis of cephalic-laterals channels system and its pores at Cottus gobio can offer an image on the main stages of their phylogeny. The first channels which are forming are the preoperculo-mandibularis (POM) followed by the infraorbitalis (IO), supratemporalis (ST) and the occipital (OC) channel. The last formed seem to be the supraorbital channels (SO). The main stages of this ontogeny suggest that the sensory channels from the mandible and upper head have the priority in their development. A number of genipores are the forerunner for the cephalic pores. The beginning genipores from the infraorbital and supratemporal cephalic surface are the most similar with those from the Gobiidae fish family. The secondary process in sensory system ontogeny consists in developing of the channel structure. The channels structure development occurred principally in the fresh water fishes it seems to be related with their environment.The total length of lateral line at the populations of Cottus gobio from the upper Tisa River is already complete at the individuals with 35-40 mm standard length. That earliest development of the cannels and its opening pores are distinctive for Cottus gobio from the Tisa River system or generally for the entire lower Danube rivers system. The mature individuals have an average number of 30-33 pores on the lateral line. The comparative study of the lateral line lengthiness correlated with the standard length of specimens reveal that the individuals from Tisa River have similarities with the populations of Cottus gobio from Czech Republic and from Polish rivers, (based on L. Koli and Witkowski data, 1969, 1995).The number of the pores on lateral line does not increase after that channel reaches the final length.
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