Total mercury (Hg) concentration was determined in the tissues of 10 pelagic fishes in the northern Gulf of Mexico, and dietary tracers (stable isotopes and fatty acids) were used to evaluate the relationship between Hg and feeding history. Highest Hg levels were observed in blue marlin (Makaira nigricans), carcharhinid sharks (Carcharhinus spp.), and little tunny (Euthynnus alletteratus), rang...

Abstract The first record of the parasite Alebion carchariae in waters Ascension Island collected from Galapagos sharks, Carcharhinus galapagensis (Carcharhinidae), is described. No previous this exists for Island, nor have sharks previously been listed as a host. Specimens A. were identified using morphological techniques and DNA barcoding cytochrome c oxidase I subunit (COI) gene. This study ...

Although sharks have a fundamental role in maintaining the balance of aquatic ecosystems, exerting great influence on lower levels food chain, their populations are declining worldwide due, to large extent, overfishing. Of 64 species registered Ecuador, from January December 2019, 19 were recorded Manta 15,455 captured individuals, with family Carcharhinidae being most abundant catches (69.4%),...