The sub-acute toxicity of the crude tentacle-only extract from the alien Cassiopea andromeda (forsskal, 1775) jellyfish was studied in rat within 21 days after exposure. For sub-acute toxicity, changes in weights and pathological parameters were studied. The intraperitoneal LD50 value of venom was estimated 104.0 μg/kg BW in male mice. For sub-acute toxicity, 3 doses of crude venom (0.0125, 0.025 and 0.05 μg/ml/day) were administered intraperitoneally to female rats, once daily for 21 days. Increase in size and weights were observed in the spleens in all groups. The Scab-like spots were seen on skin of all the rats. Histopathological examinations of the rat kidney, heart, liver and spleen tissues indicated that there were different demonstrable abnormalities and alterations in the microscopic examinations in comparison to their control groups, especially at a higher dose of 0.05 μg/ml/day.
Key words: Sub-acute toxicity, Cassiopea andromeda jellyfish, Histopathological examinations
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