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.

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    ABSTRACT: Some growth parameters and feeding aspects of the Lizardfish, Saurida tumbil, in Iranian coastal waters of the Persian Gulf (Bushehr Province), were studied by regular monthly collections during February 2006- February 2007. Among a total of 691 specimens, 538 were females, 114 males and 39 immature. The total length for females ranged from 26.1 to 58 (38.9±6.7) and for males from 25.5 to 53.5 (34.20±6.7) cm. The total weight of females ranged from 136-1550 (486.7±281.9) and for males from 116 to 1125 (332±225) g. The length-weight relationship for all fish was W= 0.0064L3.042 suggesting an isometric growth for all the fish sample. Condition factor ranged from 0.43 to 0.94 in different months. The relative length of the gut (RLG) was 0.44 on average, suggesting a carnivorous feeding habit of this fish. The maximum and the minimum gasterosomatic index (GI) (gut weight/total weight) occurred in November and in June, respectively. Amongst the 691 studied fish, 187 fish had empty, 297 semifull and 207 full stomachs. On the basis of stomachs contents, Clupeidae, Trichiuridae, Synodonthidae, Carangidae and shrimp were the most important food items, respectively. Based on the results of this study, it could be concluded that the lizard fish is a voracious piscivore species with a positive allometric growth pattern in juveniles and an isometric growth pattern in adults.
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    ABSTRACT: The reproductive biology of the Iranian cichlid, Iranocichla hormuzensis Coad, 1988, was investigated for 13 consecutive months in lower Mehran River, from August 2008 through August 2009. Four hundred and eighty six individuals (252 males and 234 females) were captured using a seine net (5 mm mesh size). The observed sex ratio was 1M:0.93F (χ², df = 1, P = 0.414). Mean ± SD of total length (TL) values in females and males were 62.08 ± 6.51 and 70.34 ± 8.16 mm, respectively. The frequency of 56-65 mm size class was higher in females and the 66-75 mm size class in males. A gonadosomatic index (GSI) analyses of females indicated that the reproductive period was during February-June, with a peak in March. Fecundity was best correlated with total body mass (M) (linear regression, r2 = 0.62) condition factor (linear regression, r2 = 0.62) and total length (TL) (linear regression, r2 = 0.56). The absolute fecundity ranged between 48-167 eggs with a Mean±SD of 107±35.2. Egg diameters ranged from 0.58 to 2.93 mm.
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    ABSTRACT: Maturity age, spawning period, fecundity and gonad histology of the Kura Barbel in Bibi-Sayyedan River of Semirom (Tigris basin) were determined. A total of 445 specimens were captured by monthly collections from August 2010 to July 2011. Specimens were caught by electrofishing, seine net and cast net and transported to the laboratory on ice for further examination. The sex ratio was determined as 1.8M:1F, a ratio significantly different from the expected ratio. Males and females become sexually mature in their first year. Gonadosomatic Index (GSI) value was the highest in April for both sexes. Mean ± SE of absolute fecundity was 8249 ± 997 eggs and also, the relative fecundity was 140 egg/g body weight. Based on the results of GSI, egg diameter and histological studies, spawning period of this fish occur from late March to August with a peak in April.
    North-Western Journal of Zoology 01/2015; · 0.70 Impact Factor


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