Ecologia trofica del tiburon martillo Sphyrna
zygaena (Linnaeus, 1758) en aguas Ecuatorianas.
Samples of Sphyrna
lewini were collected weekly from September 2004 to June 2006 at the Chipehua fishing camp located on the Oaxacan coast (16[degrees]02'3.422"N, 95[degrees]22'6.49''W).
The scalloped hammerhead, Sphyrna
lewini, was the most frequently observed species (15.2%).
Geographic variation in reproduction between two populations of the bonnethead shark, Sphyrna
Among the species of Sphyrna
commonly captured in Brazil, S.
He was the first to conduct field studies of numerous elasmobranchs, and wrote papers on the feeding habits of the Great Hammerhead, Sphyrna
mokarran (Gudger, 1907), natural history notes on the sharks and rays of Beaufort, North Carolina (Gudger, 1912), and the feeding habits of the Tiger Shark, Galeocerdo cuvier (Gudger, 1948a, 1948b, 1949).
Species that have become sporadic or rare in the Mediterranean Sea include the great white shark, shortfin mako, porbeagle, sandtiger (Carcharias taurus), smooth hammerhead (Sphyrna
zygaena), sandbar shark (Carcharhinus plumbeus), bramble shark (Echinorhinus brucus), and angular roughshark (Oxynotus centrina).
The addition of these species (green jack, Caranx caballus; pile surfperch, Damalichthys vacca; middling thread herring, Opisthonema medirastre; white surfperch, Phanerodon furcatus; Pacific sierra, Scomberomorus sierra; scalloped hammerhead, Sphyrna
lewini; angel shark, Squatina californiaca; leopard shark, Triakis semifasciata) brings the total up to 86 species, even closer to the predicted number of 89 species.
Our gross anatomical explorations of several species of shark--spiny dogfish, Squalus acanthias; black tip, Carcharhinus limbatus; smooth dogfish, Mustelus canis; scalloped hammerhead, Sphyrna
lewini, and Atlantic sharpnose, Rhizoprionodon terraenovae--did not reveal the presence of alkaline glands in these elasmobranchs.
Assessment of acid--base derangements among bonnethead (Sphyrna
tiburo), bull (Carcharhinus leucas), and lemon (Negaprion brevirostris) sharks from gillnet and longline capture and handling methods.