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
Copyright ? 2010 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any
form without prior permission. Responsibility regarding the authenticity
of the data, and the acceptability of the conclusions enforced or derived, rest
completely with the author(s).
