Determine the returned rate of cultured Cyprinidae released in west part of Anzali lagoon. In 2006
Subject Areas : New Technologies in Aquaculture Development
Keywords: Release, Keywords: Anzali lagoon, Returned rate, Chinees carp,
Abstract :
Abstract[1] The Anzali lagoon has the high ecological potential and suitable conditions for carp breeding beside the other fishes. Release and recapture of these four species (Hypophthalmichthys molitrix, Ctenopharyngodon idella, Hypophthalmichthys nobilis and Cyprinus carpio) after a period of 4-7 months and determine the returned rate, were this research goal. This research started in spring and summer of 2005 with release of 2200000 number of four species of carp fingerling with average of 30±2 gram to the west part of Anzali lagoon (Abkenar, Maroozeh and Ghoraba) in 95 times. The percent of each species fingerling’s release were %48 Ctenopharyngodon idella, %8.5 Hypophthalmichthys nobilis, %32.5 Hypophthalmichthys molitrix and %11 Cyprinus carpio. In the six mounths of sampeling with twice per week, samples measured. The weight with accuracy of one gr. And the length with accuracy of one mm. The data analysed with excel software. Final biomass of this fishes were 3.4 T for Ctenopharyngodon idella, 71.2 T for Hypophthalmichthys nobilis, 167.8 T for Hypophthalmichthys molitrix and 23.5 T for Cyprinus carpio. Generally, the Abkenar station has more catch ability than the other stations, Because %48 of the fingerlings were released in this locality. The average of length and weight of Ctenopharyngodon idella were 42±3 Cm and 1121.7±26 gram, of Hypophthalmichthys nobilis were 47.5±2 Cm and 1185.4±42 gram, of Hypophthalmichthys molitrix were 49±4 Cm and 1168.6±67 gram, of Cyprinus carpio were 38.7±3 Cm and 1208±35 gram. The results showed that with due attention to suitable depth and wide surface of west part of Anzali lagoon, the survival rate of the released fingerlings were %10. * Corresponding Author; Email: pourgholami_yas@yahoo.com
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