Water Quality in Tortum Stream and its Tributaries (Erzurum/Turkey)

Köktürk, Mine; Atamanalp, Muhammed

doi:10.17216/limnofish.205734

Cited by 1 publication

(1 citation statement)

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“…The Tortum Stream is the most important resource landslides which feeds the lake and regarded as one of the world's largest waterfall. There are four trout farm, four stone quarries, two concrete plants as well as use of irrigation water and three Hydroelectric Dams Project are not completed on the Tortum Stream and its tributaries (Köktürk and Atamanalp 2015).…”

Section: Methodsmentioning

confidence: 99%

Density, Biomass and Length-Weight Relationship of Brown Trout (Salmo trutta Linnaeus, 1758) Population in the Çoruh River Basin, North-Eastern Anatolia, Turkey

Tanır¹,

Fakıoğlu²

2017

Journal of Limnology and Freshwater Fisheries Research

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This study was conducted to determine density, biomass and length-weight relationship for brown trout (Salmo trutta Linnaeus, 1758) caught from removal method based on single-pass electro fishing. A total area of 2.176 ha was sampled and 167 fishes were caught using electro fishing between May 2012 and June 2013 in Tortumkale Stream of Çoruh River, Turkey. Mean density and biomass of brown trout were found to vary between 106-167 fish ha -1 and 4.76-10.64 kg ha -1 , respectively. The length-weight relationship exponent b values ranged from 3.0672 to 3.3158 and indicated positive allometric growth. Length-weight relationship in between stations were statistically significant (r 2 >0.9917, p<0.05). Our results revealed that the density of the brown trout population in Tortumkale Stream is at a level indicating a risk of extinction of this species. Density of brown trout occuring in restricted habitats was reduced in Tortumkale Stream; especially it causes reduction of their population overfishing on adult individuals in reproduction season and lower of recruitment to the population. Also, biotic and abiotic effects of rainbow trout (Oncorhynchus mykiss), aquacultures activities, recreational fisheries, barriers of dam construction and irrigation canals, pollution from domestic, industrial and agricultural waste contribute to the destruction of the habitat of brown trout.Keywords: Brown trout, growth, density, biomass, Turkey Ortalama yoğunluk ve biyomas değerleri sırasıyla 106-167 adet/ha ve 4,76-10,64 kg/ha arasında değişmiştir. Boy-ağırlık ilişkisinin b değerleri 3.0672-3.3158 arasında değişmiş ve pozitif allometrik büyüme gözlemlenmiştir. İstasyonlar arasındaki boy-ağırlık ilişkisi istatistikî olarak önemlidir (r 2 >0,9917, p<0,05). Elde edilen sonuçlar doğrultusunda kırmızı benekli alabalık türünün, yok olma riski altında olduğunu tespit edilmiştir. Tortumkale Çayı'nda sınırlı habitatlarda yaşayan kırmızı benekli alabalığın yoğunluğu; özellikle populasyona yeni birey katılımının azalması ve üreme döneminde yetişkin bireyler üzerine aşırı av baskısı nedeniyle azalmıştır. Aynı zamanda, gökkuşağı alabalığı akuakültür aktivitelerinin biyotik ve abiyotik etkileri, rekreasyonel balıkçılık, baraj yapılar ve sulama kanalları bariyerleri ile evsel, endüstriyel ve tarımsal atıklardan kaynaklanan pollusyon kırmızı benekli alabalığın habitatlarını tahribine katkı sunmaktadır. RESEARCH ARTICLE ReceivedAnahtar kelimeler: Kırmızı benekli alabalık, büyüme, yoğunluk, biyomas, Türkiye How to Cite

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Section: Methodsmentioning

confidence: 99%