General fisheries investigations of Maco and Mahabad reservoir

Abstract

During the year 1998 1999 Mako and Mabhabad reservoirs were surveyed by Fisheries Research Center of Guilan province Mahabad Resevoir located at 36 47 N ( Lat ) and 45 , 43 E ( Long ) in western It has an average area of 700 hectares and is mesotroph- that Azarbiajan province chracterized by depletion of oxygen in the bottom during warm months In phytoplankton , Chrysophyta and in zooplankton Rotifera were dominance . There is low diversity of benthic animals in this reservoir and Oligocheata and Chironomidae are two benthic forms that comprise the most populations The fishes of this water body can be categorized in two groups : endemic and exotic . Ichthyofauna of the reservoir and its catchment area comprise 9 endemic species and subspecies and 9 exotic species and subspecies that located in 4 family , Cyprinidae , Balitoridea Siluridea and Poeciiiidae In the reservoir and its inlets and outlets , Cyprinidae is salient component of the ichthyofauna by a figure of 83.3 % . The fishes of this reservoir are ail kind of food zooplanktoniphagous level consumers such as phytoplanktoniphagous benthophagous and picsivorous Parasitic diseases are highly incident among the fishes of this water body and it can be said that fishes of the reservoir are widely infected by the parasitic diseases . The most important waterfowls and seashore birds are that migrate to the reservoir for wintering . The most commercially endemic fish species are Sia mahi ( Capoeta capoeta ) dace ( Leuciscus cepha/us ) and catfish ( Si/urus g/anis ) and commercially exotic species are common carp ( Cyprinus carpio ) Silver carp ( Hypophtha/michthys molitrix ) and Big head (Hypophtha/michthys The annual catch of endemic and exotic species in 1998 were 124 and nobi/is ) Stock estimation showed over exploitation and 111.9 tonnes respectively underexploitation for exotic ( big head and silver carp ) and endemic ( dace and sia mahi ) fish species respectively . Estimation revealed that this reservoir annually can produce 14323 tonnes of silver carp big head and common carp and for achiveing this figuer anoually 394000 fingerlings of mentioned species should be released in this Mako reservoir which is situatd on Zang Mar river was built in 1995 It is 12 Km to Mako city with the geographical identification of 39 11 N ( Lat ) and 49 29 E ( Long ) It is a earth kind reservoir that has a maximum depth of 77 m . The length of the barrier is 210 m and the upper and lower wide of the barrier are 10 and 350 m respectively Three river entred to the reservoir are Ghezet Chay , Emam Gholi and Dibak .