Article

Contribution to the biology of the Lizardfish, Saurida tumbil (Teleostei: Aulopiformes), from the Persian Gulf

Zoology in the Middle East (Impact Factor: 0.52). 01/2006; 38:49-56. DOI: 10.1080/09397140.2006.10638164

ABSTRACT Some biological aspects of the Lizardfish, Saurida tumbil, from the Persian Gulf, Iran, were studied by regular monthly collections. A total of 173 specimens, including 17 immatures, 26 males, and 130 females from the Khozestan coasts were collected with a bottom trawl. Females ranged from 26.1 to 59.0 cm (38.7±6.8) in total length and from 126.5 to 1510 g (477.1±260.8) in weight. Males ranged from 26.3 to 38.3 cm (32.7±3.2) in total length and from 128.3 to 450.5 g (260.2±83.5) in weight. The slope of the regression line suggested an isometric growth for the fish. The gut content consisted mostly of fish species and the relative length of the gut (RLG) was 0.45 on average, suggesting a carnivorous feeding habit. The absolute fecundity was 74,444-250,452. The gonadosomatic index showed two peaks for the females (March and October), perhaps indicating that the species is a spring and autumn spawner.

Download full-text

Full-text

Available from: Yazdan Keivany, Jun 27, 2015
1 Follower
 · 
673 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A total of 691 specimens (114 males, 538 females and 39 immature) were collected from Bushehr coastal waters of the Persian Gulf, from February 2007 to February 2008 to study the reproduction of this species along with its gonad histological development. Mean absolute and relative fecundity was 263162 ± 31046 and 273 ± 27, respectively. The ova diameter ranged between 6 µ and 875 µ with a mean of 318 µ. The curvilinear relationship between fecundity and total weight was F = 2657.8 W 0.6617. Monthly changes in the gonadosomatic index exhibited a higher value in May and October in both sexes (P ≤ 0.05). Observations on the seasonal distribution of maturity stages and seasonal fluctuations in the gonadosomatic index confirmed recent findings that the spawning periods have 2 peaks, a higher in May and a lower in October. The Hepatosomatic index and GSI fluctuations were similar in females, but different in males. Males and female of Saurida tumbil reach the first sexual maturity at 25.5 and 27 cm, respectively. The sex ratio was 1M:5F (P ≤ 0.001). The simultaneous presence of postovulatory follicles and yolk globules in some ovaries indicated that this species is a multiple spawner.
    Turkish Journal of Zoology 12/2013; 37:717-722. DOI:10.3906/zoo-1301-23 · 0.59 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The present study aimed to investigate the reproductive biology and ovaria histology of female Greater lizardfish, Saurida tumbi1 (Family: Synodontidae) in the a ian coas , of the Persian Gulf (Bushehr province), from February 2007 to February 2008, conducted by, regular monthly collections. The total length of females ranged from 26.1 to 58 em and the weight r ng d from l36 to 1550 g. Observations on the seasonal distribution of maturity stages an variations' n seasonal fluctuations in the gonadosomatic index (GSI) confirmed recent findings I at the spaw J ng periods have two peaks, the first and the maximum was in May and the second and smaller pea was in October. It was found that female Saurida tumbi1 reach the first sexual maturity at 27 em. Mean absolute and relative fecundity were 263162 and 273, respectively. The m'ni urn an maximum ova diameter was 6.71/1 (stage 1) and 875.34/1 (stage 5). The curvilinear relationship between the fecundity and total weight of the fish was F=2657.8 W 0.6617. The mean of the se atio was 1:5 (M:F) This sex ratio was congruent with other studies. HSI and GSI fluctuations in females wer-e similar.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Fishes in the eastern part of the Caspian Sea experience a higher temperature and salinity, compared to those in the western part. This study was conducted on 66 specimens of female kutum, Rutilus kutum, from a migratory population to Gorgan-Rud River during March-May to compare it with the most studied western populations and to study the effects of these ecological factors on biology of kutum. The population comprised six age groups. The 5+ and 6+ age groups were dominant in the studied population. The sex ratio was 1:1.5 (M:F) that was significantly different from 1:1 ratio (p<0.05). The slope (b) of the fork length-weight regression line indicated an isometric growth (p>0.05). Relative and instantaneous growth rates decreased with age. The mean value of condition factor was 1.50 which was not correlated with age. Absolute fecundity varied from 13494 (7 years old) to 115177 eggs (8 years old). The average absolute and relative fecundity were 70300 and 51, respectively. The relationships of fecundity (F) with fork length (FL) was better stated as a power and with total weight (W), ovary weight (Wo) and age (t) as linear equations. Fecundity with FL, W, Wo and age had positive and high correlations. The relationships of ovary weight with total weight and fork length were as a linear function. Egg diame-ter varied from 158 µm to 251 µm (mean=194±17). Gonadosomatic index (GSI) varied from 4.92 to 29.05 (19.42±4.53) during the reproduction period and its peak determined to be in the last week of April. It is concluded that these ecological factors could highly affect the kutum populations and compared to the western populations, the eastern population differed in a lower b value, a lower ratio of male:female, a lower absolute and relative fecundity and a higher egg diameter. This extends our knowledge on the biology of kutum populations in different areas of the Caspian Sea.