جستجوی مقالات مرتبط با کلیدواژه "hormuzgan" در نشریات گروه "محیط زیست"

The relationship of Length-weight and reproductive of the Longnose Trevally (Carangoides chrysophrys) were studied from March 2014 to February 2015. Monthly samples at 14 stations were collected using trawl fishing. In this study, the total number of samples was 376, which 194 were females and 137 males and 45 immature. The minimum and maximum total length during different months were between 25.5 and 80 cm respectively. Weight-length relationship for Longnose Trevally was W = 0/0064TL 2/9004. This fish had an isometric growth. LM50 for Longnose Trevally was 46 cm. Sex ratio(female : male) for Longnose Trevally was 1/42:1. The maximum absolute fecundity and relative fecundity was achieved 479992 Ovule in April and 385 in July Ovule per gram of body weight respectively. The minimum absolute fecundity and relative fecundity was achieved 98247 Ovule in November and 125 in July Ovule per gram of body weight respectively. GSI female monthly average was calculated . This fish has a long spawning season from January to May and spawning peak was observed in May.

Some of feeding ecology and diet habitat of Rhabdosargus haffara is estimated in Northern of the Persian of Oman Sea (Hormuzgan province). For this purpose, 561 (220 male& 341 female) were selected. Consumption per biomass rate, Trophic level and Aspect ratio of caudal fin were calculated 14.3, 3.33±0.46 and 3.66 respectively, for the R.haffara for the first time in the north of Persian Gulf and Oman sea. A.Rc.f of demersal fish have been reported a small amount, Furthermore trophic level is shown that R.haffara have carnivorous diet. Vacuity index in this study was 66.54, also, maximum of prey occurrence index was concluded in the seasons (40.74) and the year (28.66) for bivalves. The results of ANOVA showed similarity in the frequency of prey in the difference length classes, but two of the length classes (22-24 and 30-32) had the most of prey, Also Length classes from 12-14 to 20- 22 and 32-34 had done specially in selected prey groups. Minimum and maximum of GaSI index is determined in summer of 2015 and winter of 2016. The finding of this study could be used in aquaculture and ecological modeling.

this research in 2014, the effects of density and cannibalism on survival, in Indomysis nybini was studied in Indian White Shrimp brood stock ponds of Kollahi port in Hormozgan province, Iran. Density experiment was conducted with 5 treatments, T1 =10, T2 = 20, T3= 30, T4 = 40 and T5 = 50 mysids per liter for 7 days. The treatments had 4 replications. The average water temperature was 23.8 ± 1 ° C during the experiment. In all experiments of one-liter beakers of filtered sea water was used .Artemia naupliuse was used for feeding. Cannibalism experiment was carried out with two treatments T1 with food and T2 without food. Water temperature was 24.6 ± 0.5° C during the experiment. Density experiment showed that there is significant statistical difference in survival rate among different treatments of mysid density (P≤0.05). There was no significant statistical difference in survival rate among treatments T2, T3 and T4(P≥0.05). The experiments results showed that there is significant statistical difference in survival rate among treatments T1, T5 (p≤0.05). Indomysis nybini mysid was the first mysid species that identified in Hormuzgan. Also the highest average survival rate was observed in density of (T1).This species of mysid is scavenger.