بررسي تاثير كاربرد گياه عدسك آبي (Lemna minor) در جيره غذايي بچه ماهي سفيد (Rutilus frisii kutum) بر شاخص هاي رشد، ماندگاري و تركيب بيوشيميايي بدن

Use of Duck weed (Lemna minor) meal in Caspian Kutum (Rutilus frisii kutum) diets and its effects on growth indices and carcass composition

در ﻗﺎﻟﺐ ﯾﮏ ﻃﺮح ﮐﺎﻣﻼ ﺗﺼﺎدﻓﯽ، اﺛﺮ ﺑﮑﺎرﮔﯿﺮي ﺳﻄﻮح ﻣﺨﺘﻠﻒ ﭘﻮدر ﮔﯿﺎه ﻋﺪﺳﮏ آﺑﯽ )Lemna minor( ﺑﺮ ﺷﺎﺧﺺﻫﺎ ي رﺷﺪ، ﺗﺮﮐﯿﺐ ﻻﺷﻪ و ﮐﺎراﯾﯽ ﭘﺮوﺗ ﯿﺌﻦ در ﺑﭽﻪ ﻣﺎﻫﯽ ﻣﺎﻫ ﯽ ﺳﻔﯿﺪ )Rutilus frisii kutum( ﺑﻪ ﻣﺪت 8ﻫﻔﺘﻪ ﺑﺮرﺳﯽ ﺷﺪ. ﺑﺮاي اﯾﻦ ﻣﻨﻈﻮر ﺳﻄﻮح ﻣﺨﺘﻠﻒ ﭘﻮدر ﻋﺪﺳﮏ آﺑﯽ ﺷﺎﻣﻞ ﺻﻔﺮ، 5، 10و 15درﺻﺪ، ﺑﻪ ﻋﻨﻮان ﺗﯿﻤﺎرﻫﺎي آزﻣﺎﯾﺶ ﺑﺎ ﺳﻪ ﺗﮑﺮار ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻨﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﺑﺎ اﻓﺰاﯾﺶ ﭘﻮدر ﮔﯿﺎه ﻋﺪﺳﮏ آﺑﯽ در ﺟﯿﺮه ﻣﯿﺰان وزن اﻧﻔﺮادي، ﻧﺮخ رﺷﺪ وﯾﮋه ﺑﻪ ﻃﻮر ﻣﻌﻨﯽداري ﮐﺎﻫﺶ ﺧﻮاﻫﺪ داﺷﺖ و ﺿﺮﯾﺐ ﺗﺒﺪﯾﻞ ﻏﺬاﯾﯽ در ﻣﺎﻫ ﯽﻫﺎ ﺑﻪ ﻃﻮر ﻣﻌﻨﯽداري اﻓﺰاﯾﺶ ﻣﯽﯾﺎﺑﺪ )0/05>p(. ﺷﺎﺧﺺ ﺿﺮﯾﺐ ﭼﺎﻗﯽ ﻣﺘﻔﺎوت ﻣﻌﻨﯽداري ﻧﺪاﺷﺖ )0/05

In this study, in a completely randomized experimental design, the effects of different levels of duck weed (Lemna minor L.) meal in Caspian kutum diet on growth indices, carcass composition were investigated in an 8- week period. Different replacement levels of 0, 5, 10 and 15% were consisted the treatments in triplicates. Fingerlings with the mean initial weight of 2.02 ± 0.08 g were distributed in the experimental tanks. The results indicated that addition of duck weed powder in kutum diet more than 5% up to 15 caused a significant decrease (p<0.05) in final body weight, specific growth rate and feed conversion ratio, conversely condition factor (CF) had not significant differences (p>0.05). It was concluded that with increasing the duck weed levels in diet, lipid, protein and ash contents did not show any significant differences in fish carcasses compared to control (p>0.05), however moisture increased with increasing the rates of duck weed in the diet. Getting the same results of growth indices in treatment containing 5% duckweed and control (p>0.05), confirmed that duck weed can be used at the level of 5% in the kutum diet.