اثر جايگزيني پودر ماهي با كنجاله سويا و مخمر نانوايي بر عملكرد رشد و تغذيه ماهيان جوان بني سال Mesopotamichthys sharpeyi Gunther,1874

Effect of fish meal replacement by soybean meal and baker’s yeast on growth performance and feed utilization of juvenile Mesopotamichthys sharpeyi

در مطالعه حاضر اثر جايگزيني پودر ماهي باكنجاله سويا و مخمر نانوايي بر رشد، شاخصه ‌هاي تغذيه‌اي، مورفومتريك و بازماندگي ماهيان جوان بني (Mesopotamichthys sharpeyi) مورد بررسي قرار گرفت. تيمار غذايي شامل تيمار شاهد (فاقد پودر سويا و مخمر نانوايي)، سطح 25%، سطح 50%،  سطح 75% و سطح 100% جايگزيني پودر ماهي با كنجاله سويا و مخمر نانوايي با نسبت برابر هركدام با سه تكرار در قالب يك طرح تصادفي بررسي شد. در هر تكرار 40 عدد ماهي با ميانگين وزن 0/29±4/40 گرم در مخازن 300 ليتري ذخيره‌سازي و سه بار در روز در حد سيري به مدت 8 هفته تغذيه ­شدند. نتايج نشان داد كه جايگزيني پودر ماهي با سطوح مختلف پودر سويا و مخمر نانوايي اثر منفي بر وزن نهايي (37/0±80/7 در مقابل 35/0±13/7 گرم) و درصد بازماندگي ماهيان (45/3±5/96 در مقابل 40/1± 63/97 درصد ) در تيمار 100 درصد جايگزيني پودر ماهي در مقايسه با شاهد نداشته است (0/05

In this study, effect of fish meal replacement by soybean meal and baker's yeast on the growth performance, feed utilization, morphometric parameters and survival of juvenile Mesopotamichthys sharpeyi were studied. Five diets consisted of a control treatment (no soybean meal and yeast), 25%, 50%, 75% and 100% fish meal replacement by soybean meal and baker's yeast with the same ratio in triplicates were randomly examined. In each 300 liter L tank, 40 juveniles with average weight of 4.4 ±0.29 g were stock and fed to satiation triple daily. The results showed that, fish meal replacement by different levels of soybean meal and baker's yeast had no negative effect (p > 0.05) on the final growth (7.8± 0.37g vs.7.13 ±0.35 g ) and survival rate (96.5±3.5 vs.97.63± 1.4 %) of juveniles in treatment of 100% fish meal replacement compared to control group. Also, the results showed that total feed intake (376.59± 26.34 vs. 309. 73± 7.92 g), total protein intake (120.5 ± 8.41 g vs. 99.1±2.55) (p<0.05) and food conversion ratio (3.10 ± 0.11 vs. 2.7± 0.17) (p>0.05) were increased. Also, protein efficiency ratio was significantly (p<0.05) decreased in treatment of 100% fish meal replacement compared to control group (1.03±0.03 vs. 1.13±0.08 g). Visceral somatic index, hepatosomatic index and condition factor of juveniles were not significantly (p>0.05) different among treatments. So, it is suggested that soybean meal and baker’s yeast can be used for completely fish meal replacement in diet of binni fish.