Examination of Behavioral Traits of Monocultures and Polycultures of Two Different Trout Species (Oncorhynchus mykiss, Salmo sp.) at Different Ratios Depending on Various Factors

Year 2021, , 187 - 192, 31.12.2021

Boran Karataş , Muhammed Arabacı

https://doi.org/10.31594/commagene.995166

Abstract

: The present study aimed to determine both the effects of monocultures of rainbow trout (R) and brown trout (B) and polycultures (R 75%-B 25%; R 66%-B 34% and R 50%-B 50%) on behavior. In the study, the area used vertically by the fish in the tank, the mobility rate of fish in the tank, the rate of tendency of fish in eating as soon as they were fed, whether the fish test the feed, the interspecies feed competition, the time they start to take the first feed, the duration of the feed consumption of the fish and the feed area of the fish have been considered as behavioral evaluation criteria. The trout were monitored with a camera to determine their behavior. Considering all behavioral criteria, the best polyculture rate was determined as R 66%-B 34%. Brown trout were found to be more mobile and exhibit more relaxed behavior compared to other groups in polyculture. In addition, interspecies feed competition was mostly encountered in this group. As a result, in this study, in which two different trout species were monocultured and treated at different polyculture ratios, the main factor causing behavioral change in fish was found to be the different stocking rates of fish to each other in the same tank. Different rates applied in polyculture caused unpredictable changes in behavior in both species. The ratio of fish used in polyculture was found to be a considerable factor affecting the final product and their behavior for aquaculture.

Keywords

Behavioral change, brown trout, polyculture, rainbow trout.

Thanks

We would like to thank Zeynel Avcil and Soran Avcil (Avcil Trout Facility), Muhittin Esen (Mis Trout Facility) and Selim Mantaş (Yeşilsu Trout Facility) for their support in providing study materials. This paper is based on a part of MSc dissertation of the first author.

İki Farklı Alabalık Türünün (Oncorhynchus mykiss, Salmo sp.) Monokültürleri ile Farklı Oranlarda Polikültürlerinin Çeşitli Faktörlere Bağlı Davranış Özelliklerinin İncelenmesi

Abstract

Bu çalışmada gökkuşağı alabalığı (G) ve kahverengi alabalığın (K) monokültürleri ile farklı oranlarda (G%75-K%25; G%66-K%34 ve G%50-K%50) polikültürlerinin davranış üzerine etkilerinin belirlenmesi amaçlanmıştır. Çalışmada balıkların; tankta dikey olarak kullandığı bölge, tanktaki hareketlilik oranları, yemin ilk verildiği anda yeme karşı ilgi yüzdesi, yemi test edip etmediği, türler arası yem rekabeti, ilk yem almaya başlama süresi, yemi tüketme süresi ve yem aldığı bölge davranış değerlendirme ölçütleri olarak dikkate alınmıştır. Alabalıkların davranışlarını belirlemek için kamera kayıtları kullanılmıştır. Tüm davranış ölçütleri dikkate alındığında en iyi polikültür oranı G%66-K%34 olarak belirlenmiştir. Bu gruptaki kahverengi alabalıkların polikültürdeki diğer gruplara kıyasla daha hareketli olduğu ve daha rahat davranış sergiledikleri görülmüştür. Ayrıca türler arası yem rekabeti de en fazla bu grupta görülmüştür. Sonuç olarak iki farklı alabalık türünün monokültürünün ve farklı oranlarda polikültürünün yapıldığı bu çalışmada balıklardaki davranış değişikliğine sebep olan temel etken, balıkların aynı tanktaki birbirlerine olan farklı stoklama oranlarıdır. Polikültürde uygulanan farklı oranların iki türün davranışlarında önceden tahmin edilemeyecek şekilde değişikliklere sebep olmuştur. Polikültürde kullanılan balıkların birbirlerine olan oranları, yetiştiricilikte davranışı nihai ürünü etkileyen ve dikkate alınması gereken önemli bir faktördür.

Keywords

Davranış değişikliği, gökkuşağı alabalığı, kahverengi alabalık, polikültür

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