The influence of environmental abiotic factors on the qualitative and quantitative structure of ichthyofauna from predeltaic Danube area

Petronela Georgiana Calin Sandu, Lucian Oprea

Abstract


The aim of the paper  is to analyse the influence of environmental factors on the capture and fish communities structure from Danube, between Siret River and Prut River mouth. Fish were collected from April to December 2012 in four fishing areas. During the year, 4910 kg, respectively 7121 fish of 31 species were collected. Cyprinidae, the dominant family, 54.84% in term of number of species, was represented by 17 species (Cyprinus carpio, Carassius gibelio, Barbus barbus, Abramis brama, Abramis sapa, Blicca bjoerkna, Leuciscus idus, Vimba vimba, Aspius aspius, Pelecus cultratus, Chondrostoma nasus, Ctenopharingodon idella, Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, Scardinius erythrophthalmus, Rutilus rutilus, Alburnus alburnus). Other families had the following structure: Percidae (16.13%) with 5 species (Sander lucioperca, Zingel zingel, Zingel streber, Perca fluviatilis, Gymnocephalus schraetzer), Acipenseridae (12.90%) with 4 species (Huso huso, Acipenser stellatus, Acipenser ruthenus, Acipenser gueldenstaedtii), Clupeidae (6.45%) with two species (Alosa immaculata, Alosa tanaica), Siluridae (3.23%) with one species (Silurus glanis), Esocidae (3.23%) with one species (Esox lucius)  and Salmonidae (3.23%) with one species also (Salmo labrax). The highest capture was 2977.93 kg (60.65%), during the spring season (April-May), followed by autumn season (September–November), with 992.39 kg (20.21%). The water level and water flow showed high correlation with both number and total catch, respectively.

Keywords


Danube; fish communities; abiotic factors; catch

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LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Bioengineering Faculty of Animal Resources
300645, Timişoara, Calea Aradului 119, Romania

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