Biology of the iberian chub (Squalius carolitertii) in an atlantic-type stream (river Lima basin-north Portugal). A preliminary approach

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Maia, HMS (Author) Other; Maia, CFQ (Author) Other; Pires, DFC (Author) Other; Valente, ACN (Author) FCUP

Journal

Title: Limnetica

Vol. 25

Pages: 713-722

ISSN: 0213-8409

Publisher: Associacion Espanola de Limnologia

Indexing

ISI Web of Knowledge

Scopus - 6 Citations

Other information

Authenticus ID: P-007-GYW

Abstract (EN): The iberian chub (Squalius carolitertii) is an endemic species whose biology is yet largely unknown and which is catalogued as being endangered. Therefore more information about its biology is essential to develop appropriate management strategies. The Estorãos River population has been studied from December 1995 to March 2002 through regular electro-fishing surveys. Additionally, a fish trap installed in the river from November 2001 to July 2002 allowed for the collection of information on population movements and reproduction. The results revealed some fluctuations in the density estimates, though the Squalius carolitertii population in the Estorÿos River is quite low. Six age classes (0+ to 5+) were identified. Iberian chub growth is isometric and can reach a final length of 33.5 cm. Sexual dimorphism is evident, with males maturing earlier and at smaller sizes. An increase of the Iberian chub movements was detected from middle April onwards. These movements were related to the beginning of the reproductive period and were mainly correlated with the rise of water temperature. Our results indicate that the population characteristics do not differ substantially from those of other endemic chub populations in the Iberic peninsula. © Asociación Española de Limnología.

Language: English

Type (Professor's evaluation): Scientific