Investigation on some growth characteristics of Gambusia Gambusia holbrooki (Girard, 1859) in some aquatic ecosystems of Golestan Province, Northern Iran
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Nazireh Fattahi * , Rahman Patimar , Rasuol Ghorbani , Mohammad Farhangi , Arsalan Bahalkeh |
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Abstract: (8748 Views) |
Knowledge on the characteristics of exotic species is important in ecological studies and has applications in ecosystem and species management. This investigation was conducted to study some of the growth characteristics of Gambusia holbrooki in six water-bodies in the north-east region of Iran, (Golestan province). A total of 8500 specimens was collected monthly using plankton-collector net(sachuk) from February to September 2012. Age was determined using the opercula and scales. The results showed that the maximum age was 2+ for both sexes. The largest specimen had 59 mm TL and 3.83 g weight. The largest average total length and weight were 34.1 ±0.68 mm (±SD) and 0.71 ± 0.47 g (±SD) in Gomishan wetland for females, and the smallest average total length 24.7 ±0.24 mm (±SD) for males in Alakuli reservoir, the smallest average total weight 0.20 ± 0.06 g (±SD) in Alma-Gol wetland and 0.20 ± 0.29 g (±SD) in Ala-kuli for males. Weight-length relationships were significant. Growth pattern was negative allometrice for males and positive allometrice for females, except for the females of Ala-kuli reservoir. The smallest condition factor was observed in Bandar-Torkaman for males and in Gomishan wetland for females |
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Keywords: Gambusia, Age and Growth, Golestan, Iran. |
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Type of Study: Research |
Subject:
Special Received: 2015/08/19 | Accepted: 2015/08/19 | Published: 2015/08/19
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