Abstract
Alabalik yetistiriciliginde buyuk baliklarin kucuklerden ayrilmasinin ve dolayisi ile siniflandirmanin kafes ortaminda ne derece etkili oldugunun belirlenmesi amaciyla yapilan bu calismada iki farkli deneme grubu olusturulmus ve 75 gunluk besleme donemi sonunda besi performanslari degerlendirilmistir. Denemede boylanmis grubu (K) 72,14±3,48 g lik kucuk baliklar olustururken, diger grubu (B+K); %80 kucuk baliklar (71,04±1,10) ve %20 buyuk baliklar (151,8±8,14) olusturmustur. Deneme sonunda (K) grubunun 203,52±16,20 g ortalama canli agirliga ulasirken (B+K) grubunun kucuk bireyleri 185,13±21,77 g, buyuk bireyleri ise 223,25±28,00 g ortalamaya ulasmislardir. Boylanmis gruptaki yem degerlendirme orani (1,61±0,052) diger gruptan (2,17±0,039) daha dusuktur (P<0,05). Elde edilen bu sonuclara gore sadece kucuk bireylerin oldugu ayni boydaki grubun bireylerinin daha iyi buyudugu ve yemden yararlanma oranlarinin daha iyi oldugu ve dolayisi ile %20 oraninda buyuk baliklarin varligi alabaliklarda buyumeyi kotu yonde etkiledigi sonucuna varilmistir. Anahtar Kelimeler: Alabalik, Boylama, Kafes, Yetistiricilik Abstract The Effects of Size Grading on Growth Performance of Rainbow Trout ( Oncorhynchus mykiss ) in Floating Cage Condition In the study, the effects of size grading on growth of rainbow trout in cage condition was examined. Two different test groups were made and after 75 days of daily diets the fattening performance value was analyzed. In the research, the graded group (S) was formed with small fish (72.14±3.48 g) while the other group (L+S) was formed with 80 % of small fish (71.04±1.10 g) and 20% of large fish (151.8±8.14 g). At the end of the study, the average weight of K group was found as (203.52±16.20 g); on the other hand in the group (L+S) the average weight of small fish was determined as (185.13±21.77 g) and the large ones as (223.25±28.00 g). Also feed conversion ratio in group S (1.61±0.052) was found lower than the other group (2.17±0.039). As a result of the study it was found that small fish in the same graded group grew more and feed conversion rate were better. Therefore, the growth performance of trout has been affected adversely by 20 % of large fish in the group (L+S). Key Words: Trout, Size Grading, Cage Aquaculture
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