The relationship between weight and total length with accumulation of lead and cadmium metals in muscle tissue of male and female common ferrous fish (Lutjanus johnii, Bloch, 1792) (Coastal water of Hormozgan province)

Some heavy metals such as cadmium and lead have no role in the natural metabolism of aquatic animals and these metals are toxic to living organisms even at low concentrations. This study was conducted to study the effect of body size (total length and total weight) on the accumulation of lead and cadmium in common redfish (Lutjanus lohni) in three regions of Bandar Abbas, Bandar Lengeh and Jask in Hormozgan province. The number of samples in each station was sampled separately. In the laboratory, after bioassay, muscle tissue was separated and lead and cadmium were extracted by chemical digestion and their concentrations were read by atomic absorption spectrometry. The results of the study showed that the concentration of lead and cadmium in the muscle tissue of redfish in three areas of Bandar Jask, Bandar Abbas and Bandar Lengeh with body size (body length and weight) had a negative Pearson correlation coefficient (r) and was significant (p>0.05). The results of tissue analysis of common red fish muscle in the study areas have the highest and lowest concentrations of lead metal equal to 0.2686+0.1 and 0.550+0.1 μg/g and for cadmium metal, respectively. It was shown with 0.021+0.01 and 0.057+0.01 μg/g. The results also show that the Jask port area is significantly different from Bandar Abbas and Bandar Lengeh areas in terms of the amount of lead and cadmium elements in muscle tissue (p>0.05).It can be concluded from the data of this study that in the study areas in the Persian Gulf (Bandar Abbas, Bandar Lengeh and Jask) a very weak relationship between the body size of the studied species has been shown. The trend of accumulation of the studied elements in ordinary redfish has not affected the sex (male or female) and also the contamination of these elements in the present study has been less than the international standards reported.