Condition, Length-Length and Length-Weight Relationships for Four Introduced Freshwater Fish Species from an Insular Ecosystem (Gökçeada, Turkey)

Year 2021, Volume: 6 Issue: 3, 403 - 408, 28.09.2021

Sevan Ağdamar , Özcan Gaygusuz

https://doi.org/10.35229/jaes.923425

Abstract

The present study aims to investigate the condition, length-weight (LWRs) and length-length relationships (LLRs) of four introduced freshwater fish species (Carassius gibelio, Cyprinus carpio, Gambusia holbrooki, and Pseudorasbora parva) inhabited in the inland waters of Gökçeada (Çanakkale, Turkey). Fish samples were collected using electrofishing from one lentic (Büyük Stream) and four lotic (Aydıncık, Dereköy, Gökçeada, and Uğurlu Reservoirs) ecosystems between April 2019 and September 2020. The calculated values of parameter b in the LWRs were 3.275 and 3.230 for G. holbrooki (Uğurlu and Büyük populations, respectively), 3.031 and 2.937 for C. carpio (Aydıncık and Dereköy populations, respectively), 3.129 for C. gibelio and 3.047 for P. parva. Values of Fulton's condition factor (K) varied between 1.72 ± 0.23 (P. parva, Gökçeada population) and 3.60 ± 0.33 (C. carpio, Dereköy population). The coefficients of correlation (r) for all the LLR equations were greater than 0.95 and significantly linear. The present study provides the first knowledge about the selected biological parameters for four introduced freshwater fish species in Gökçeada.

Keywords

Growth parameters, non-native species, island, inland waters.

Thanks

This study was conducted as out of scope with the permission of Çanakkale Onsekiz Mart University Committee of Animal Experiments Local Ethics (Decision No: 2021/02-18) and dead animal tissues were used. The authors thank Dr. Gülşah Saç and Sedat Ozan Güreşen for their helps during the field surveys. The authors also thank Prof. Müfit Özuluğ, Dr. Ersin Doğaç, Dr. Çiğdem Gürsoy Gaygusuz, and Dr. Ümit Acar for their contributions to the study. The authors express their gratitude to Istanbul University Faculty of Aquatic Sciences for the laboratory access provided by Gökçeada Marine Research Unit.

Bir Ada Ekosistemindeki (Gökçeada, Türkiye) Dört Aşılanmış Tatlısu Balığı Türünün Kondisyon, Boy-Boy ve Boy-Ağırlık İlişkileri

Abstract

Bu çalışma, Gökçeada (Çanakkale, Türkiye) içsularında yaşayan dört aşılanmış tatlısu balığı türünün (Carassius gibelio, Cyprinus carpio, Gambusia holbrooki ve Pseudorasbora parva) kondisyon, boy-ağırlık ilişkileri (BAİ) ve boy-boy ilişkilerini (BBİ) incelemeyi amaçlamaktadır. Balık örnekleri Nisan 2019 ila Eylül 2020 ayları arasında bir lentik (Büyük Dere) ve dört lotik (Aydıncık, Dereköy, Gökçeada, ve Uğurlu Baraj Gölleri) ekosistemden elektroşok cihazı kullanılarak toplanmıştır. BAİ kullanılarak hesaplanan b parametresi değerleri G. holbrooki için 3.275 ve 3.230 (sırasıyla Uğurlu ve Büyük populasyonları), C. carpio için 3.031 and 2.937 (sırasıyla Aydıncık ve Dereköy populasyonları), C. gibelio için 3.129 ve P. parva için 3.047’dir. Fulton’un kondisyon faktörü (K) değerleri 1.72 ± 0.23 (P. parva, Gökçeada populasyonu) ile 3.60 ± 0.33 (C. carpio, Dereköy populasyonu) arasında değişiklik göstermiştir. Tüm BBİ denklemleri için korelasyon katsayıları (r) 0.95'ten büyük ve önemli ölçüde doğrusal olarak belirlenmiştir. Bu çalışma, Gökçeada'da tespit edilen dört aşılanmış tatlısu balığı türü için seçilen biyolojik parametreler hakkındaki ilk bilgileri sağlamaktadır.

Keywords

Büyüme parametreleri, doğal olmayan tür, ada, içsular

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