The fifth culture generation of Black Sea Trout (Salmo trutta labrax): Culture characteristics, meat yield and proximate composition

Abstract

In this research, the culture characteristics of the fifth generation of Black Sea trout (Salmo trutta labrax PALLAS, 1814) were evaluated. First of all, trout were cultured in recirculating aquaculture system (RAS) and they kept in RAS until smoltification. After that, they were transported to marine cages till market size. Thus, the ratios of specific growth rate (SGR), feed conversion (FCR), mortality and condition factor (CF) were specified from hatching to 16 th month and the results were evaluated as pre-smoltification and after-smoltification individually. Moreover, the meat yield and proximate composition of Black Sea trout's fifth generation was specified in market size. Samplings were carried out monthly between February 2014 and May 2015. Fish were started to feed in 0.105±0.007g until they reached to 335.50±44.39g in May 2015. According to results; SGR, CF, FCR and mortality were determined as between 0.98-2.70, 0.86-1.15, 1.02-1.30 and 7.67-7.78% until smoltification stage, respectively. However, they were detected between 0.68-2.36, 1.04-1.20, 0.98-1.35 and 0.01-5.82% after smoltification. Also, the meat yield, viserosomatic index (VSI) and hepatosomatic index (HSI) were found to be 60.30%, 9.28% and 1.65% in market-size respectively. According to chemical analyses, trout meat contains crude protein as 15.22%, fat as 7.21%, ash as 1.51% and water (moisture) as 75.17%. In the view of the results, culture characteristics, proximate composition and meat yield were found similar to other cultured trout species. With these features, the fifth generation can be recommended to aquaculture sector considering the economic value of the Black Sea trout in Turkey.

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“…Hatchery origin of Black Sea trout females (F4) spawn in November, December and January in cultural conditions while Black Sea trout females spawn in November and December in their natural environment (Cakmak et al, 2018). One month longer breeding season than the natural individuals is an advantage for the aquaculture production planning.…”

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“…Salmonid production has increased dramatically over the last 30 years (Asche & Bjorndal, 2014) and associated with this growth, triploidy applications have become more commonly used methods in important salmonid species just like Atlantic salmon (Salmo salar L., 1758) and rainbow trout (Oncorhynchus mykiss Walbaum, 1792) (Gray, Evans, & Thorgaard, 1993). Besides these species, Black Sea trout (Salmo labrax PALLAS, 1814) which is an endemic salmonid species for Eastern Black Sea (Okumuş, Kurtoğlu, & Atasaral, 2004) is culturing widely nowadays and it becomes more popular day by day in turkey (Çakmak, Çankırılıgil, & Özel, 2018;TSI, 2015). In spite of this popularity and increasing usage of triploid applications, only few studies (Akhan, Delihasan Sonay, Okumuş, Köse, & Yandi, 2011;Akhan, Serezli, & Delihasan Sonay, 2011) were carried out about on triploidy of Black Sea trout.…”