بررسي ارزش غذايي (اسيدهاي چرب ضروري) سيكلوپوئيد كوپه پود Acanthocyclops trajani تغذيه‌شده با جيره‌هاي مختلف ميكرو جلبكي و گياهي

Study on Nutritional value (Essential Fatty Acids) of the cyclopoid copepod Acanthocyclops trajani fed on different microalgal and herbal diets

در اﯾﻦ ﺗﺤﻘﯿﻖ ﮐﻪ در ﺷﻬﺮﯾﻮر ﻣﺎه ﺳﺎل 1396 اﻧﺠﺎم ﮔﺮﻓﺖ، اﺛﺮات ﺟﯿﺮهﻫﺎي ﻣﺘﻨﻮع ﺑﺮ ﺗﺮﮐﯿﺐ اﺳﯿﺪﻫﺎي ﭼﺮب ﺿﺮوري ﺳﯿﮑﻠﻮﭘﻮﺋﯿﺪ ﮐﻮﭘﻪﭘﻮدAcanthocyclops trajani ﺟﻬﺖ ﺑﻬﺒﻮد ارزش ﻏﺬاﯾﯽ ﺑﺮرﺳﯽ ﺷﺪ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر، اﺑﺘﺪا ﮐﻮﭘﻪﭘﻮد در ﻣﺨﺎزن120 ﻟﯿﺘﺮي ﺑﺎ ﺗﻐﺬﯾﻪ از ﺟﯿﺮهﻫﺎي ﻣﺨﺘﻠﻒ )3 ﺗﯿﻤﺎر، ﻫﺮﮐﺪام در ﺳﻪ ﺗﮑﺮار( ﺷﺎﻣﻞ ﺗﺮﮐﯿﺐ زﻧﺪه ﻣﯿﮑﺮو ﺟﻠﺒﮏﻫﺎيScenedesmus obliquus وSpirulina maxima ، ﻣﺨﻠﻮط ﺧﺸﮏﺷﺪه ﻣﯿﮑﺮو ﺟﻠﺒﮏﻫﺎي ﻣﺬﮐﻮر )ﺑﺎ ﻧﺴﺒﺖ 1:1( و ﺗﺮﮐﯿﺐ ﺧﺸﮏﺷﺪه ﺳﺒﺰﯾﺠﺎت )اﺳﻔﻨﺎج، ﺟﻌﻔﺮي و ﮔﺸﻨﯿﺰ( ﺑﻪ ﮐﺸﺖ اﻧﺒﻮه رﺳﯿﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﻧﻮع و ﻣﯿﺰان اﺳﯿﺪﻫﺎي ﭼﺮب ﺿﺮوري در ﺑﺪن ﮐﻮﭘﻪ ﭘﻮد ﺑﻪﻃﻮر ﻣﻌﻨﺎداري ﺗﺤﺖ ﺗﺄﺛﯿﺮ ﻧﻮع ﺟﯿﺮه ﻏﺬاﯾﯽ ﺑﻮد )0/05

In this study which was carried out in September 2017, the effects of different diets on essential fatty acid composition of cyclopoid copepod Acanthocyclops trajani were studied. For this purpose, firstly, the copepods were mass cultured in 120 liter tanks by feeding on different diets (3 treatments, 3 replicate in each one) including fresh composition of microalgae: Scenedesmus obliqqus and Spirulina maxima, dried compound of mentioned microalgae (1:1) and dried composition of vegetables (spinage, parsley and coriander). The results indicated that the type and amount of essential fatty acids in copepod body were be influenced by food diet type, significantly (P<0/05). The Docosahexaenoic acid, DHA (C22:6n-3), was (%3/75±1/08) significantly higher than other treats in copepods fed on dried microalgae. Also, the analysed copepods indicated the higher levels of Eicosapentaenoic acid, EPA (C20:5n-3), and DHA in relation to corresponding diets, which confirms, with due attention to low content of Highly unsaturated fatty acids, HUFA, in diets, A.trajani is probably potential to bioconversion or accumulation of essential fatty acids. On the basis of this study, also with due attention to higher level of DHA/EPA in copepoda feeding by dried microalgae, there is the potential of the usage of them during shortage or descending time of fresh microalgae.