Abstract
This study was conducted on the type of shrimp Penaeus indicus samples provided from the Ministry of Agriculture, representing the farm fish Obhor (Jeddah) on the Red Sea. This study aimed to study the effect of exposure of shrimps to different concentrations of cadmium on gill filaments and heart rate, as well as, its bioaccumulation in tissues. Cadmium concentrations ranged from 0.0 to 8.0 µg /L. Concentrations of cadmium were measured using atomic absorption spectrophotometer. The lethal concentration 96LC50 was found to be 4.5 µg /L Cd and the 2.5 µg /L Cd fell within the range of sublethal (chronic) toxicity, whereas the 8.0 µg /L Cdrepresented the 24LC50 level of toxicity. The study revealed that the heart rate showed a regular increase with increased Cd concentration reaching a maximum rate of 246 heart beat per minute at 8.0 µg /L Cd compared to 139 heart beat per minute for controls. The histological studies further revealed the presence of explicit damage in gill filaments at Cd levels of 8.0 µg /L, whereas at 4.5 µg /L Cd level an obvious contraction of gill was observed as compared to unchanged control samples. This damage was believed to have caused the animal to increase its heart beat rate as a reaction to compensate for the loss in respiratory area.
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