Growth and Feeding Ecology of Dnieper chub Petroleuciscus borysthenicus (Kessler, 1859) in Şahinkaya Reservoir, an Artificial Water Body of an Island Ecosystem (Gökçeada, Turkey)

Authors : Sevan AĞDAMAR, Gülşah SAÇ

Pages : 76-85

Doi:10.28979/jarnas.1008841

View : 22 | Download : 12

Publication Date : 2022-03-10

Article Type : Research Paper

Abstract :Bio-ecological studies and life-history traits of small-bodied fishes are critical for the understanding of their ecolog-ical role as well as the assessment of their position and continuity in the ecosystems. The current study goals to present initial data on growth and feeding habit of small-bodied Petroleuciscus borysthenicus inhabited in an island ecosystem insert ignore into journalissuearticles values(Gökçeada, Turkey);. During the seasonally sampling surveys from May 2020 to January 2021, a total of 163 specimens were collected from Şahinkaya Reservoir using electrofishing. SL and W values of samples ranged from 2.6–10.0 cm and 0.32–25.68 g, respectively. LWR and K values were estimated for all specimens as W=0.017×SL3.114 insert ignore into journalissuearticles values(r=0.988); and 2.04 insert ignore into journalissuearticles values(±0.28);, respectively. F:M sex ratio was calculated as 1:1.33 with no signifi-cant difference from the ratio of 1:1 insert ignore into journalissuearticles values(2=0.02; p>0.05);. Diet of the species comprised of ten different food items. Plant insert ignore into journalissuearticles values(63.6%); was the most preferred food item from the point of frequency of occurrence insert ignore into journalissuearticles values(F%);, pursued by Dip-tera insert ignore into journalissuearticles values(31.8%); and Odonata insert ignore into journalissuearticles values(12.7%);. According to IRI insert ignore into journalissuearticles values(%); values of food items, Diptera was the dominant food item in all seasons. B and BA values were estimated as 3.18 and 0.24, respectively. The results showed that P. borysthenicus was more selective on conveniently accessible food materials in the environment and its food pref-erence was affected by seasonal food supply.
Keywords : Condition factor, feeding habit, Growth, insular ecosystem, length weight relationship