شناسه هاي افزوده :
پرافكنده حقيقي، فرخ همكارطرح , دريانبرد، غلامرضا همكارطرح , نادري جلودار، مهدي همكارطرح , جانباز، اصغر همكارطرح , ملائي، حسن همكارطرح , باقرزاده افروزي، فرامرز همكارطرح , لالوئي، فرامرز همكارطرح , طالشيان، حسين همكارطرح , صفوي، ابراهيم همكارطرح , سالارپوري، علي همكارطرح , رضائي، مرضيه همكارطرح , سجادي، اسداله همكارطرح , عليزاده جلگه، قاسم همكارطرح , معافي، علي همكارطرح
چكيده انگليسي :
The objective of this study was conducted to determine length, weight, age, growth parameters and natural mortality of fishes in the Azad Dam. According to the result, there were observed 12 species in the dam and Komasi river, which 9 species exist in the dam. Of 852 speciemens in the Dam, Alburnus chalcoides was predominated, 54.7% of total catch. Then Capoeta trutta, Hemiculter leucisculus, C. damascina and auratus
Carassius were comprised 14.8, 11.7, 10.6 and 6.7%, respectively. Also, in the Komasi river there was 9 species which C. trutta redominated (27.3%) and C. damascina and A. chalcoides comprised 19.2 and 18.9%, respectively. The mean (±SD) of fork length were observed 292.2±59.47 mm and 522.45±328.87 g for C. carpio
(as the biggest spcies) and 74.5±0.71 mm and 4.24±0.35 g cm for Pseudorasbora parva (as the smallest spcies). The relative weight of A. chalcoides, C. damascina, C. trutta, C. auratus and H. leucisculus were 120.0±16.58, 109.8±20.96, 89.5±10.14, 104.9±9.97, and 100.9±14.15 %. In fork length – weight relationship b was calculated 2.3663, 2.8897 and 2.8736 for A. chalcoides, C. damascina and C. trutta, respectively which indicating negative allomertic growth. The b were 3.0382 and 3.2541 for H. leucisculus and C. auratus indicating isometric and positive allomertic growth, respectively. The sex ratio (Male:Female) were 1:0.49, 1:0.47 and 1:0.33 for A. chalcoides, C. damascina and H. leucisculus which indicating males predominated and 1:27.50 and 1:1.88 for C. auratus and H. leucisculus indicating females predominated. The Growth parameters were L∞=170.3 mm, K=0.46/yr, t0=-0.59/yr for A. chalcoides, L∞=385.9 mm, K=0.13/yr, t0=-0.81/yr for C. damascina, L∞=247.8 mm, K=0.30/yr, t0=-0.70/yr for C. trutta, L∞=270.1 mm, K=0.33/yr, t0=-0.11/yr for C. auratus and L∞=226.1 mm, K=0.37/yr, t0=-0.12/yr for H. leucisculus, respectively. The naturaly mortality, M were calculated 0.85, 0.30, 0.56, 0.60 and 0.68, respectively.
كليدواژه :
سن و رشد , مرگ و مير , ماهي , سد آزاد , كردستان