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AGE, GROWTH AND MORTALITY RATES OF Barbus grypus AT THE UPPER ZAB RIVER NORTHERN IRAQ | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 1, 2009, Pages 0-0 | ||
| Authors | ||
| A. J. Al-Rudainy; N. S. Al-Mufty | ||
| Abstract | ||
| The age, growth and mortality rates of Barbus grypus were studied at the Upper Zab river in Iski Kalak village, northern Iraq. Fishes were obtained during the period of October 2005 to November 2006. A total of 276 specimens with total lengths ranged from 14-40.5cm and 17.5-430gm in total weight. The age of fish ranged between 1- 6 years with the domination of age 3 (73 specimens reached 29.9cm in length and 127gm in weight). B. grypus may reached a maximum length of 47.5cm as can be predicated by Von Bertalanffy equation: Lt= 47.5 {l-e-0.35(t+0.15) } The total mortality rate (Z) for B.grypus reached1.22 at Upper Zab river. The exploitation rate (E) was 0.56 rather than the standard value (0.65). This means an increase in fishing mortality rate. The results showed that B. grypus in this river lives shorter and grow slower compared with other inland water system. Mortality was also higher due to the intensive fishing. | ||
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