Record of morphological abnormality in embryos of Caribbean sharpnose shark, Rhizoprionodon porosus (Elasmobranchii, Carcharhinidae), from the south coast of São Paulo State, Brazil / Registro de anomalia em embriões de cação frango – Rhizoprionodon Porosus na região sul de São Paulo (Elasmobranchii carcharhinidae) no Brasil

Edris Queiroz Lopes, Cristianne Valverde, Luiz Henrique Cruz de Mello, Tatiane Gonçalves de Lima, Luana Felix de Melo


The subclass Elasmobranchii aggregate the sharks and rays that are cartilaginous fish present on the planet millions of years ago. Sharks are efficient predators that occupy all oceans, being important in the balance of the marine ecosystem. There are not many reports of a morphological abnormality for the group, but the cases increase gradually. Most of the reported morphological abnormalities are cases of bicephaly or albinism. Factors such as parasitic infection, mechanical lesions, congenital abnormality and environmental conditions are pointed as possible causes of deformities, as well as anthropic activities such as pollution and excised fishing. Neonates of Rhizoprionodon porosus evaluated in the present study have a deformity in the caudal fin region. The 8 individuals were delivered to the Institute of Marine Biology and Environment in 2016 for research and better understanding of the case. The reports of anomalies found are of great importance to understand the functioning of the group and to have control of the cases, thus verifying if there is an increase in the number of animals presenting anomalies in the last decades.


anomaly, embryo, shark.

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