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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Nov 2010, 31 (6)                                                                                                             Back



abstract_01

Seasonal variation of fish abundance and biomass in gillnet catches

of an East Mediterranean lake: Lake Doirani

 

Dimitra C. Bobori* and Ioanna Salvarina

 

Laboratory of Ichthyology, School of Biology, Department of Zoology,

Aristotle University of Thessaloniki, PO Box 134, 541 24, Thessaloniki, Greece

 

(Received: August 19, 2009; Revised received: January 05, 2010; Accepted: February 27, 2010)

 

Abstract: The seasonal variation of fish species composition and abundance in gillnet catches (14-90 mm knot-to-knot) from the Greek part of the transboundary Lake Doirani was studied during the period 2006-2007. A total of 8,419 specimens weighting 182.3 kg and belonging to 9 species were caught. Catch composition differed with season. Thus, Rhodeus meridionalis dominated in terms of NPUE the spring, Perca fluviatilis the summer and Alburnus macedonicus the autumn and winter catches. Cyprinids were generally the most abundant, with the cyprinids:percids biomass ratio ranging from 1.7 in summer to 14.8 in winter, supporting the eutrophic character of the lake. Richness and Shannon-Wiener diversity and evenness indices differed seasonally (ANOVA; p < 0.05). The abundance-biomass comparative (ABC) curves showed that fish communities were dominated by one or a few opportunistic species (e.g. Rhodeus meridionalis, Alburnus macedonicus), which while dominated in number did not dominate in biomass, being small bodied.

Key words: Abundance, Biomass, Freshwater fish, Gillnet catches, Lake Doirani

PDF of full length paper is available online

 

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