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.

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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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