Effects of different culture densities on growth performance and stress, immune, and metabolic responses in rainbow trout
Article Type:
Research/Original Article (دارای رتبه معتبر)

Determining the optimal culture density is necessary to improve fish performance and profitability. A total of 1350 rainbow trout with an average initial weight of 30±1.5 g were obtained. Then, the fish were randomly distributed in 12 fiberglass tanks and reared at densities of 15, 30, 45 and 60 kg/m3 for 60 days. The final weight, weight gain, and protein efficiency ratio were significantly higher and the feed conversion ratio was lower in fish reared in densities of 30 and 45 kg compared to densities of 15 and 60 kg. The highest levels of serum cortisol and lactate were observed at the density of 60 kg, followed by the density of 15 kg, which indicates the presence of stress in high culture density and very low density. The activity of serum lysozyme in densities of 15 and 60 kg was significantly lower than the density of 30 kg. The lowest serum total antioxidant capacity value, osmolality, and complement activity (ACH50) and the highest serum ALT activity were observed in fish reared at the highest density. Serum globulin level was significantly higher and serum AST activity was lower at densities of 30 and 45 kg than the density of 60 kg. The lowest levels of serum cholesterol, low-density lipoproteins (LDL), high-density lipoproteins (HDL), and triglycerides were also observed at the density of 60 kg. The results showed that very low culture density, like high culture density, can have negative effects on the performance of rainbow trout. Therefore, medium densities (30 and 45 kg/m3) are recommended for rearing of this species.

Journal of Applied Ichthyological Research, Volume:10 Issue: 4, 2023
28 to 35
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!