عنوان مقاله [English]
This study was carried out in conversation area "Khojir", east of Tehran in October 1998. Specimens of Chironomus sp. and G. fasciatus were collected by a 0.04µ mesh size net and transferred to Shilamayesh Consulting Engineer Company lab and kept in refrigerator. Then, the number of casualty for both species in different cultures including cobblestone, sand, weed and rotten leaves have been counted and tested for feeding responses. In a 62 days period of the study, the maximum casualty numbers of G. fasciatus (26) was found in sand culture; whereas, for Chironomus sp. was in cobblestone by a number of 30. The minimum casualty amount of Chironomus sp. and Gammarus fasciatus were 9 and 18 in an algal culture, respectively. There was no significant difference before and after feeding for both Chironomus sp. and G. fasciatus. Also there was no significant difference between different cultures and the amount of casualty. This study aims to investigate the possibility of keeping Chironomus sp. and G. fasciatus in vitro in order to feed cultured fish.